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The Importance of Circuit Board Pattern Purpose

Thursday, December 26th, 2024

The purpose of circuit board pattern is very critical and practical. Conductive lines are like “roads” on circuit boards, which are responsible for connecting various electronic components so that current can pass smoothly and realize electrical functions. Pads are the “landing points” of components. Pads of different shapes and sizes correspond to different components. For example, the pads of chip capacitors are small and regular, ensuring accurate welding of capacitors.

What is a circuit pattern?

A circuit pattern is a diagram that uses graphic symbols and lines to represent the circuit connection. It is mainly used to reflect the electrical connection and working principle of each component in an electronic device.

The Importance of Circuit Board Pattern Purpose

Basic components of circuit patterns

Electronic component symbols: Each electronic component has its own specific symbol to represent the function and characteristics of the component in the circuit. Common electronic component symbols include resistors, capacitors, inductors, diodes, triodes, integrated circuits, etc.

Connecting wires: used to connect electronic component symbols to indicate the electrical connection between electronic components. In circuit diagrams, connecting wires are usually represented by solid lines to represent the conductive circuit path, and dotted lines to represent control signals or other special connections.

Power and ground: The power supply is the energy source for the circuit to work, usually represented by a circle or rectangle, with the voltage value and polarity of the power supply marked on it. The ground is the reference potential point in the circuit, usually represented by a triangle or ground symbol.

Labels and annotations: Used to explain the parameters, models, functions of electronic components and the working principle of the circuit. Labels and annotations can be in words, numbers, symbols, etc.

What are the types of circuit board patterns?

The types of circuit board patterns mainly include the following:

Schematic diagram: The schematic diagram, also known as the electrical schematic diagram, is a basic drawing that shows the working principle of the electronic circuit. It draws all the components in the circuit and their connection methods in detail, and is an important reference for designing, analyzing and repairing circuits.

Block diagram: The block diagram is a simplified circuit diagram that uses boxes and wires to represent the main functions and composition of the circuit. It does not show each component in detail, but divides the circuit into several functional modules, each module is represented by a box, and its function is marked.

Assembly drawing: The assembly drawing is a drawing drawn for the actual assembly of the circuit, which details the position, installation method and connection relationship of each component in the circuit. The symbols on the assembly drawing are usually the physical appearance of the components, which facilitates the actual assembly of the circuit according to the drawings.

Printed board drawing: The printed board drawing is also called the printed circuit board drawing or printed circuit board drawing, which shows the layout and connection relationship of the components on the PCB. The symbols and lines on the printed board drawing indicate the connection relationship between the copper foil lines on the PCB and the component pins, ensuring the correctness and reliability of the circuit.

What are the lines on a circuit board for?

The lines on the circuit board are mainly used to connect various electronic components to ensure the normal operation of electronic equipment. Specifically, the lines on the circuit board have the following main functions:

Connecting electronic components: The lines on the circuit board connect electronic components such as chips, capacitors, resistors, etc. through wires, jumpers, etc. to form a complete circuit, thereby ensuring that the electronic equipment can work properly.

Power supply and signal transmission: The power supply line is responsible for providing energy to each unit circuit on the circuit board to ensure the normal operation of the equipment. The signal line is used to transmit various signals, such as audio and video signals.

Grounding and protection: The ground wire is used to ground each electronic component to ensure the safety of electronic products. The protection circuit monitors the operating status of the circuit to prevent abnormal conditions such as overvoltage and overcurrent from damaging the equipment.

Data and control: Data lines are used to transmit various data, and control lines are used to control various operations of electronic products.

In addition, the design and maintenance of the circuit board are also the key to ensuring the normal function of the circuit. When designing, factors such as the layout, width, number of layers, impedance matching and signal-to-noise ratio of the line need to be considered to ensure the stability and transmission quality of the line.

What is schematic diagram and why is it important in making PCB layout?

A schematic diagram is a diagram that shows the connection relationship between the components in the circuit. It graphically shows the connection relationship and signal flow of the components in the circuit. It is not only a preliminary idea of the circuit design, but also a key reference for subsequent PCB layout and wiring.

The importance of schematic diagrams in PCB layout

Design basis: The schematic diagram provides the basic framework and connection relationship for PCB design. Designers determine the location of components and the number of layers of the circuit board by analyzing the schematic diagram.

Quality control: The design quality of the schematic diagram directly affects the quality of the entire project. Accurately understanding the design requirements, selecting appropriate components and verifying them are the keys to ensuring the correctness of the schematic diagram.

Wiring basis: Schematic diagram is the basis of PCB wiring. By analyzing the schematic diagram, designers can determine the location of components and the layout of the circuit board to ensure smooth signal transmission and avoid problems such as short circuit and open circuit.

Debugging and maintenance: In the process of product debugging, maintenance and improvement, the schematic diagram plays an indispensable role, helping technicians to quickly locate problems and repair them.

What is the purpose of a PCB layout?

The main purpose of PCB layout is to optimize circuit performance and reduce costs. Specifically, PCB layout involves the reasonable arrangement and connection of electronic components according to the predetermined circuit diagram design to ensure that the physical structure and electrical connection of the circuit board meet the design requirements, thereby ensuring the normal operation and stable performance of the circuit.

How to understand PCB layout?

PCB layout refers to the process of placing electronic components on a printed circuit board (PCB) in a reasonable manner. This process not only involves the arrangement of physical locations, but also requires consideration of electrical performance, manufacturing, and maintenance.

Basic principles and steps of PCB layout

Schematic diagram analysis: Before PCB layout, you need to understand the schematic diagram and analyze the circuit. This includes distinguishing the circuit according to analog circuits and digital circuits. At the same time, mark out the heat-generating devices and easily interfered devices in the circuit.

Modular layout: Based on the understanding of the schematic diagram, a modular layout can be established. Select each circuit module and place it in a specific area on the PCB to facilitate subsequent wiring and debugging.

Signal flow layout: For simple circuits, a signal flow layout can be adopted, usually based on the flow of power signals.

Center-radiant layout: For complex circuits, especially those involving multiple devices and diverse functions, a center-radiant layout can be adopted, usually with the CPU as the center, and then layout for its peripheral circuits.

Considerations for PCB layout

Electrical performance: High-frequency components and low-frequency components need to be placed in different areas to avoid mutual interference. The wiring length also needs to be optimized, and shortening the critical signal path can reduce delays.

Heat dissipation performance: For components with high power and high heat generation, a reasonable layout can provide them with a good heat dissipation channel to prevent components from being damaged due to overheating.

Manufacturing: A good layout facilitates the installation and welding of components by automated production equipment, improving production efficiency and product quality.

Maintenance: A clear and organized layout facilitates the later maintenance personnel to quickly locate and replace faulty components, reducing maintenance costs and time.

What is patterning in PCB?

Patterning in PCB is the process of making conductive copper foil into specific patterns and circuits on insulating materials according to the design. The steps are as follows:

Inner layer production: Clean the copper clad board and apply photosensitive film; stack the copper clad board with PCB layout film, irradiate with UV lamp, clean with alkali solution, etch off the copper foil under the uncured film, and then tear off the film to get the inner layer circuit.

Hole wall copper plating and outer layer patterning: Chemical deposition on the hole wall and surface copper plating; repeat the pattern transfer and etching steps on the outer layer to form the final conductor pattern.

Solder mask and silk screen printing: Apply solder mask ink and pattern to protect the circuit and facilitate installation; silk screen printing is used for identification, mostly white or black.

Through these steps, the conductive copper foil is accurately patterned on the insulating material to form a printed circuit board with specific functions and layout.

In short, the circuit board pattern is crucial. Conductive circuits ensure electrical connections and drive components to work together; pads adapt to various components to ensure stable installation; logos and silk screens help workers assemble and maintenance personnel troubleshoot; large areas of copper foil dissipate heat and metallized areas shield electromagnetic interference to maintain stable operation of the circuit board.

How much does FR4 weigh?

The weight of FR4 varies depending on the thickness and size of the board. It is an epoxy glass fiber cloth laminate, and its weight mainly depends on its volume and density.

The formula for calculating weight (W) is W = ρ*V, where (V) is volume and (ρ) is density.

Therefore, the weight of FR4 depends on its volume (determined by length, width, and thickness) and density. After knowing the specific size and density, the weight can be accurately calculated.

What is the raw material of FR4?

The raw materials of FR4 mainly include glass fiber and epoxy resin.

FR4 is a composite material made of glass fiber cloth impregnated with epoxy resin and then formed under high temperature and high pressure.

Specifically, FR4 is an epoxy board with a flame retardant grade of 4. Its raw materials include epoxy resin, an organic polymer compound, and glass fiber. This material has excellent insulation, mechanical strength and heat resistance, and is widely used in the electronics industry.

How thick is FR4 PCB material?

The common thickness range of FR4 PCB material is 0.2mm to 3.2mm, of which the most common thickness is 1.6mm.

Specific common thicknesses include 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, etc.

In addition, the common thickness of FR4 rigid board is 0.8-3.2mm, while the common thickness of thin board is less than 0.78mm.

What are the properties of FR4 material?

The main properties of FR4 material include flame retardancy, mechanical properties, electrical properties, heat resistance, chemical resistance and environmental protection.

Flame retardancy: The “FR” in FR4 material stands for “Flame-Retardant”, which means flame retardant. It contains special chemicals that can slow down the spread of fire when a fire occurs and protect electronic equipment from damage.

Mechanical properties: FR4 has high strength and stiffness, with tensile strength and compressive strength of up to 65,000 psi and 38,000 psi respectively, which makes it perform well when subjected to mechanical stress.

Electrical properties: FR4 maintains good insulation properties in both dry and humid environments. Its dielectric constant is 4.2-4.7, and the dielectric constant changes with temperature, but it does not change much in the temperature range of 0-70 degrees.

Heat resistance: The heat resistance of FR4 is represented by the glass transition temperature (Tg), which is usually 130°C, 140°C, 150°C or 170°C. It will not deform or melt when used at 160°C, ensuring the stability and service life of the material.

Chemical resistance: FR4 has good chemical resistance and can resist erosion in corrosive environments such as acids and alkalis.

Environmental protection: With the increasing awareness of environmental protection, the environmental protection characteristics of FR4 are also valued. Its flame retardant rating reaches 94V-0, and it produces almost no harmful gases when burning, which is more friendly to the environment and human health.

What does the 4 stand for in FR4?

The “4” in FR4 represents its material grade and specific chemical composition.

FR4 is a flame-retardant glass fiber reinforced epoxy laminate, where “FR” stands for “Flame Retardant” and the number “4” indicates the specific grade of this material.

Specifically, FR4 is a double-sided copper-clad PCB board made of epoxy resin and glass fiber cloth, which has excellent mechanical strength, electrical insulation, heat resistance and flame retardancy.

FR4 has a flame retardant rating of UL94 V-0, which means that it can quickly self-extinguish when burning, greatly improving the safety of electronic products. In addition, FR4 also has excellent mechanical properties, can withstand high temperatures and physical stress, and has good electrical insulation and low moisture absorption, making it suitable for a variety of electronic devices.

What is high Tg FR4 material?

High Tg FR4 material is a special printed circuit board material with a high glass transition temperature (Tg), usually above 170°C. High Tg FR4 material can maintain stable performance and shape in high temperature environments, so it is widely used in electronic devices that need to withstand high temperature and high stress environments.

Advantages and application areas of high Tg FR4 material

High temperature resistance: High Tg FR4 material can maintain the stability of shape and performance in high temperature environments, and is suitable for high temperature electronic equipment, automotive electronics, aerospace and communication equipment and other fields.

Good electrical properties: Even at high temperatures, high Tg FR4 material can still maintain good electrical properties to ensure the stable operation of the circuit.

Stable mechanical properties: High Tg FR4 material has a low coefficient of thermal expansion and can maintain its shape at high temperatures, avoiding curling and deformation.

Why is FR4 used in PCB?

There are several reasons why FR4 material is widely used in PCB:

Good insulation: In a circuit, it is crucial to prevent current from flowing in unintended paths. FR4 material is an excellent insulator that can effectively isolate different conductive lines, avoid short circuits, and ensure the normal operation of the circuit.

Stable dielectric constant: The dielectric constant of FR4 is relatively stable, which is very critical for the transmission of high-frequency signals. A stable dielectric constant can reduce signal delays and distortion during transmission and ensure signal integrity.

Good dimensional stability: FR4 has a low coefficient of thermal expansion, and its dimensional changes are small when the temperature changes, which can keep the PCB size relatively stable and ensure that the connection between electronic components will not loosen or be damaged due to thermal expansion and contraction.

Chemical corrosion resistance: FR4 material has good tolerance to many common chemicals and can resist corrosion from chemicals such as acids, alkalis, and salts, thereby protecting the internal structure and electrical performance of the PCB from damage.

Good moisture resistance: Moisture is one of the biggest enemies of electronic equipment, which may cause circuit short circuits, component damage and other problems. FR4 material has a certain moisture resistance, which can prevent the intrusion of moisture and reduce the risk of PCB failure in a humid environment.

Easy to process and shape: FR4 material can be easily made into PCBs of various shapes and sizes through a variety of processing techniques. It is suitable for conventional PCB manufacturing processes such as drilling, cutting, and etching, and can ensure high processing accuracy and quality.

Relatively low cost: Compared with some high-end special materials, the cost of FR4 material is more reasonable. While meeting the performance requirements of most electronic devices for PCBs, it can effectively control production costs.

In short, the density of FR4 is determined by raw materials and processes. This density has a significant impact on the mechanical properties, electrical properties, and processing technology of the PCB. In production, rigorous measurement and quality control are used to ensure that the density meets the standards. As a professional PCB manufacturer, BEST Technology is well aware of the key role of FR4 density. From material selection to processing, it strictly follows the standards and relies on exquisite craftsmanship to create PCBs with excellent performance for customers to meet diverse electronic needs.

What Is Aluminum Backed PCB?

An aluminum-backed PCB is a type of printed circuit board (PCB) where the base layer is made of aluminum rather than the traditional fiberglass or other materials. The key difference is the metal core, which significantly enhances the thermal conductivity of the PCB. The aluminum core is typically covered with a dielectric layer that isolates the conductive circuit from the metal base, allowing the PCB to maintain its electrical properties while providing better heat dissipation.

The combination of the aluminum base and the dielectric layer makes these PCBs ideal for high-power applications where heat management is essential. The aluminum core helps quickly dissipate heat away from sensitive components, thus improving the overall efficiency and lifespan of the device.

Understanding Aluminum Backed PCBs: Benefits and Uses

What Temperature Can Aluminum PCB Withstand?

Aluminum PCBs are designed to withstand high temperatures, but the exact temperature tolerance depends on several factors, including the thickness of the aluminum substrate and the quality of the dielectric layer. In general, aluminum-backed PCBs can handle temperatures up to about 130°C. However, it’s important to note that the temperature tolerance also depends on the specific materials used in the construction of the PCB and the environmental conditions in which it operates.

For high-power applications like LEDs, where heat is generated during operation, aluminum PCBs are a great choice because they help maintain lower temperatures. By dissipating heat effectively, they prevent components from overheating, which could otherwise damage the circuits.

How Thick Is the Dielectric Layer of Aluminum PCB?

The dielectric layer of an aluminum PCB plays a crucial role in providing electrical insulation while also allowing heat to be transferred away from sensitive components. The thickness of the dielectric layer typically ranges from 50µm to 200µm, depending on the application and the desired thermal performance.

Thicker dielectric layers are used in high-power applications where enhanced electrical insulation and thermal management are required.

What Are the Advantages of Aluminum PCB?

Aluminum PCBs offer several advantages, which make them an attractive choice for many industries. Here are some of the most notable benefits:

1. Superior Heat Dissipation: One of the key advantages of aluminum-backed PCBs is their excellent thermal conductivity. The metal base helps quickly dissipate heat away from the components, reducing the risk of overheating and prolonging the lifespan of the device. This makes them ideal for applications like LED lighting, power supplies, and high-power electronic devices.

2. Lightweight and Durable: Despite being made from metal, aluminum PCBs are lightweight yet durable. The metal core provides structural integrity without adding unnecessary weight, which is especially important in industries like automotive and aerospace.

3. Enhanced Performance: The combination of a high-quality dielectric layer and the aluminum substrate leads to better electrical performance, especially in high-current applications. Aluminum PCBs provide a stable platform for components to function optimally, minimizing electrical noise and interference.

4. Cost-Effective: Compared to other types of dissipation heat materials, aluminum-backed PCBs can be more cost-effective, especially for applications where heat dissipation is critical. Their lower manufacturing costs combined with higher production efficiency can reduce overall production costs, making them a preferred option for many applications.

5. Widely Applications: Aluminum-backed PCBs are primarily used in applications where heat dissipation is a concern. They are excellent for high-power applications, audio device, Communication electronics, Office automation equipment, automobile, computer, and etc. As a chief manufacturer partner for aluminum PCB, Best Technology provides custom service and full turn-key solutions. For more information or any inquiry, warm welcome to reach out to us via sales@bestpcbs.com.

What Are the Disadvantages of Aluminum PCB?

While aluminum-backed PCBs offer numerous benefits, there are some drawbacks to consider. However, these limitations are generally outweighed by their advantages in many applications. Let’s look at a few of the challenges:

1. More Complex Manufacturing Process: The manufacturing process for aluminum-backed PCBs can be more complex compared to traditional PCBs. This complexity can increase the production time and cost, especially for custom designs.

2. Mechanical Stress: Aluminum is a relatively soft metal, which means it can be prone to deformation or bending under mechanical stress. This makes it unsuitable for applications where the PCB will be subject to harsh physical conditions or mechanical pressure.

3. Conductive Issues: The surface of aluminum PCB is prone to oxidation. Besides, The heat conductivity coefficient of aluminum is relatively low. Thus the metal core of aluminum PCBs can sometimes create challenges in terms of electrical grounding. Proper design and careful manufacturing are essential to ensure that the electrical properties of the PCB are maintained.

Why Is Aluminum No Longer Used in Integrated Circuits?

While aluminum used to be a common material for integrated circuits (ICs), it has largely been replaced by copper and other materials in modern IC manufacturing. There are several reasons for this shift:

1. Better Electrical Conductivity of Copper: Copper has better electrical conductivity than aluminum, making it the material of choice for interconnects in integrated circuits. Copper’s lower resistance allows for faster signal transmission and better overall performance.

2. Miniaturization of ICs: As ICs have become smaller and more complex, aluminum’s larger size and weaker electrical properties no longer meet the demands of modern integrated circuit design. Copper allows for the miniaturization of ICs without sacrificing performance.

3. Corrosion Resistance: Aluminum is more prone to oxidation compared to copper, which can affect the long-term reliability of integrated circuits. Copper, on the other hand, is more resistant to corrosion and offers better durability.

Despite these factors, aluminum still plays a crucial role in specific applications, particularly in PCBs where heat dissipation is the primary concern. Its ability to manage heat effectively makes it a valuable material in the realm of power electronics and LED technology. At Best Technology, quality is the priority. With 18 years manufacturing experience, we can provide high-quality Aluminum Backed PCBs solutions with fast delivery. Pls feel free to contact us to get more information and personalized solutions.

In a nutshell, aluminum-backed PCBs offer an effective solution for managing heat in high-power applications, making them a popular choice in industries like LED lighting, automotive electronics, and power supply systems. With advantages like superior thermal conductivity and lightweight durability, aluminum PCBs are a top choice for projects that require efficient heat dissipation.

However, they do come with some challenges, including more complex manufacturing processes and potential mechanical stress. Understanding these limitations is key to determining whether an aluminum PCB is the right choice for your specific needs. Whether you’re designing a custom aluminum PCB for LED lighting or exploring its benefits for power electronics, these PCBs offer unique advantages that make them a valuable asset in modern electronic design.

What is a PCB prototype?

PCB prototypes are early samples of products, mainly used to test design concepts and verify the feasibility of designs. It not only tests basic user functions, but also needs to have certain functionality to ensure that the overall function of the design can operate normally. During the PCB prototype production process, engineers can test different PCB designs and manufacturing specifications to find the best solution.

The role of PCB prototypes:

Shorten time: Through PCB prototypes, design engineers can quickly and accurately test design problems and reduce the number of design iterations, thereby shortening the design cycle and reducing costs.

Improve customer satisfaction: Customers can see product prototypes in advance, which can better communicate needs, reduce misunderstandings and rework during design and production, and ensure that the final product meets customer needs.

Ensure design feasibility: PCB prototypes can test circuit boards before production, discover and fix potential design defects, and avoid rework and cost waste after production.

How to make PCB prototyping?

The following are brief steps to make PCB prototypes:

Step 1: Design circuit schematics

Use the schematic capture tool to select components according to circuit functional requirements and connect them logically in the software. After drawing, check its logic and integrity, and use the electrical rule check function to troubleshoot errors to ensure that it meets the requirements.

Step 2: Plan PCB layout

Import components into the layout software, place them reasonably according to component characteristics, plan wiring at the same time, take into account power lines, ground lines and high-speed signal wiring requirements, and adjust components and wiring to meet rules and space restrictions.

Step 3: Generate production files

Generate Gerber files, make BOM materials list at the same time, and communicate with manufacturers to ensure that the files meet production requirements.

Step 4: Select the manufacturing method

Choose breadboard (flexible but high contact resistance, etc.), perforated board (needs soldering, more stable but more complicated wiring) or PCB manufacturing (high quality but high cost, long cycle) according to the complexity, size and budget of the circuit.

Step 5: Manufacture PCB board

Breadboard directly plugs components and connects jumpers; perforated board needs to solder components; PCB manufacturing gives relevant documents to manufacturers for production according to the process, and maintains communication during the process to ensure quality and delivery.

Step 6: Drilling

Choose a drill bit according to the size of the component pin, use a drilling machine to drill vertically, control the depth, especially for multi-layer boards, and clean up the debris in the hole after drilling.

Step 7: Soldering components

After cleaning the component pins, place them in the corresponding position of the PCB, use a soldering iron, solder wire (hot air gun for patch, etc.) to solder according to specifications, and check the quality of the solder joints after soldering to ensure that there are no problems such as false soldering and short circuits.

Step 8: Test the circuit board

Perform visual inspection (look at the appearance, component installation, solder joints, etc.), functional testing (input signals according to the designed functions to see if the output meets expectations) and electrical testing (use instruments to measure whether the electrical parameters are normal) to promptly troubleshoot and repair problems.

How much does a PCB prototype cost?

The cost of a PCB prototype varies depending on many factors, mainly including circuit board size, number of layers, materials, process complexity, etc.

Circuit board size: The larger the circuit board, the higher the cost.

Number of layers: Multi-layer circuit boards are usually more expensive than single-layer or double-layer circuit boards because the manufacturing process is more complicated.

Material type: Different materials have different costs, and high-performance materials are usually more expensive.

Surface treatment: Surface treatment processes such as gold plating and immersion gold will affect the cost.

Minimum line width, line spacing, aperture: The higher the accuracy requirements of these parameters, the higher the cost.

Special requirements: Additional requirements such as impedance control and special markings will increase the cost.

What is the difference between prototype PCB and assembly?

The main difference between prototype PCB and assembly lies in their purpose, quantity, production cycle and cost.

1. Purpose and quantity

Prototype PCB: Mainly used to test and verify the design, ensure the feasibility and performance of the design in practical applications, and its quantity is usually large.

Assembly: Usually refers to mass production, the quantity is usually more than 500 pieces, or even thousands of pieces.

2. Production cycle and cost

Prototype PCB: The production cycle is short, usually no more than 10 days, suitable for rapid testing and adjustment of the design. Although the unit price is high, the total cost is low because problems can be discovered and solved in time to avoid losses during mass production.

Assembly: The production cycle is long, generally 20-25 days. The unit price is low, but the total cost is high because a large number of products need to be produced.

3. Design and production process

Flexibility: The prototype PCB production process is more flexible and can be adjusted and modified according to design requirements.

Quality control: The quality control standards of prototype PCB can be moderately relaxed to complete production faster. Mass production requires strict quality control to ensure that each board is defect-free.

Is a breadboard a protoboard?

A breadboard is a prototype board, also known as a solderless breadboard or a universal circuit board. It is mainly used for prototyping and experimental verification of electronic circuits. It can quickly assemble and test circuits without soldering.

The structure of a breadboard includes a conductive hard substrate, an insulating material layer, and an epoxy glass cloth board or a double-sided glass cloth board covered with a copper layer. There are many holes on the top for plugging electronic components, such as DIP (dual in-line package), SMD (surface mount device) and THT (through-hole technology).

The breadboard uses U-shaped metal contacts to hold component leads and wire segments inserted through holes, and uses spring tension to fix components, providing a flexible and convenient way to connect circuits.

The use scenarios of breadboards are very wide, suitable for prototyping and debugging of various electronic projects. Due to its characteristics of not requiring soldering, breadboards are particularly suitable for beginners and experimenters who need to frequently replace components.

What is the difference between PCB prototype and breadboard?

PCB prototype and breadboard have the following main differences in prototyping:

1. Usage:

Breadboard: When using breadboard for circuit construction, you only need to insert the component pins into the corresponding small holes, without soldering, which is very suitable for temporary circuit testing and small-scale prototyping.

PCB prototype: You need to use circuit design software to draw a circuit diagram first, and then convert the design into conductive lines and component layout on the PCB. The PCB is made through a series of processes, and finally the components are soldered to the PCB to complete the circuit construction.

2. Advantages and disadvantages:

Breadboard:

Advantages: easy to use, flexible, can quickly build and modify circuits; no professional tools and equipment are required, suitable for beginners and small-scale production.

Disadvantages: The circuit connection is not stable enough and is easily affected by vibration and temperature difference; it is not suitable for large-scale production and complex circuit design; after long-term use, the metal contact points are easily oxidized and cause poor contact.

PCB prototype:

Advantages: The circuit connection is stable and reliable, suitable for the design and production of various complex circuits; it can achieve high-density wiring and compact arrangement of components; it is easy to realize automated production and batch replication; it has good protection performance and can resist interference from the external environment.

Disadvantages: The design and production costs are relatively high, requiring professional knowledge and skills support; the production cycle is long, not suitable for rapid prototyping and temporary testing needs; once the production is completed, the circuit structure and component layout are not easy to modify.

3. Applicable scenarios:

Breadboard: suitable for beginners and small-scale prototyping, as well as temporary circuit testing.

PCB prototype: suitable for the design and production of complex circuits, as well as the needs of large-scale production and long-term stable operation.

What are the three types of breadboards?

Breadboards are mainly of the following three types: solderless breadboard, single breadboard and combination breadboard.

Solderless breadboard: This breadboard has no soldered power socket, is small in size, easy to carry, and is suitable for small circuit experiments. Its disadvantage is that the power connection is inconvenient and not suitable for large-scale circuit experiments.

Single breadboard: Single breadboard is small in size, easy to carry, and can be easily turned on and off. But its disadvantage is that it is small in area and not suitable for large-scale circuit experiments.

Combination breadboard: Combination breadboard is to fix multiple solderless breadboards on the motherboard, and connect the power lines of each board together through the copper foil in the motherboard.

The use of PCB prototype board covers several key steps such as preparation, inspection, layout welding, testing and debugging, and maintenance and preservation. As a professional PCB manufacturer, BEST Technology has rich practical experience in the design and development of PCB prototypes. From the precise drawing of the schematic to the high-quality prototype production, every link is strictly controlled to ensure the provision of excellent performance, stable and reliable PCB prototypes.

What is high-frequency vs low frequency?

Definition of high frequency and low frequency

Low-frequency circuit: mainly used to process signals with lower frequencies, usually in the range of tens of hertz to several thousand hertz. Common applications include audio circuits, etc.

Is rf assembly high frequency or low frequency？

High-frequency circuit: used to process signals with higher frequencies, usually in the range of several thousand hertz to several hundred megahertz. High-frequency circuits are very important in applications such as communications, radars, and satellites.

Differences between high frequency and low frequency in PCB design

Power supply design: In high-frequency PCB design, the power supply design is usually one layer, which can minimize signal loops and thus reduce noise.

Signal integrity: High-frequency PCB design requires special attention to signal integrity, including signal transmission delay, reflection and crosstalk.

Is RF high or low-frequency?

RF (radio frequency) is high frequency. It refers to the electromagnetic frequency that can be radiated into space. Its frequency range is from 300kHz to 30GHz, so it belongs to the high-frequency category. Alternating current that changes less than 1000 times per second is called low-frequency current, while alternating current that changes more than 10,000 times per second is called high-frequency current. RF is such a high-frequency current.

Basic characteristics of RF

Frequency and wavelength: The frequency of RF is between 300kHz and 30GHz. The wavelength is inversely proportional to the frequency, that is, the shorter the wavelength, the higher the frequency. The frequency of RF is higher, so the wavelength is shorter.

Amplitude and phase: The amplitude signal of RF represents the measure of the change of electric field oscillation, and the phase represents the position of a single time point in the wave cycle.

Modulation: In order to achieve communication, the RF signal needs to be modulated. Modulation includes analog modulation and digital modulation, which uses frequency, phase and amplitude to transmit data.

What is the highest RF frequency?

The highest frequency of RF (radio frequency) is 300GHz. Within this frequency range, RF is widely used in fields such as radar and wireless communication.

The basic characteristics of RF include frequency, wavelength, amplitude and phase. Frequency refers to the frequency of electromagnetic field oscillation, measured in Hertz (Hz). Wavelength is inversely proportional to frequency, that is, wavelength is equal to the speed of light divided by frequency. The amplitude of RF refers to the measure of the change in electric field oscillation, while the phase indicates the position of a single time point in the wave cycle.

How do you know if the frequency is high or low?

In PCB design, judging whether the frequency is high or low is mainly based on the frequency range of the signal.

Definition of frequency range

High frequency: usually refers to signals with frequencies between 3MHz and 300GHz. In PCB design, signals greater than 50MHz are generally considered high-speed signals, and signals with rising/falling edges less than 50ps are also considered high-speed signals.

Low frequency: usually refers to signals with frequencies between hundreds of Hz and hundreds of kHz.

Specific applications in PCB design

High-frequency PCB design: In high-frequency PCB design, the power supply design is usually one layer, which can minimize the signal loop and thus reduce noise. In addition, high-frequency signals are susceptible to interference, so special attention should be paid to noise issues in the design.

Low-frequency PCB design: Low-frequency circuit design usually does not need to consider signal loops and noise issues too much, but it is still necessary to pay attention to signal integrity and electromagnetic compatibility.

Measurement methods and tools

Oscilloscope: Oscilloscope is a common tool for measuring signal frequency. The frequency range of the signal can be judged by observing the waveform.

Spectrum analyzer: Spectrum analyzer can measure the frequency component of the signal more accurately and is suitable for occasions requiring high-precision measurement.

What is high-frequency PCB?

High-frequency PCB is a special type of circuit board designed specifically for processing high-frequency signals, and its operating frequency can reach hundreds of megahertz (MHz) to tens of gigahertz (GHz). High-frequency PCB occupies a key position in high-frequency application scenarios such as wireless communication, 5G, Wi-Fi, radar, and high-speed data transmission.

High-frequency PCB has a low dielectric constant, which leads to less signal loss during transmission. It is suitable for efficient transmission. It uses special materials to ensure a small dielectric constant, thereby ensuring transmission speed and meeting the needs of high-speed data transmission. In the field of precision metal material heating treatment, high-frequency PCB can achieve heating of components of different depths to meet various heating needs.

What is RF PCB?

RF PCB is a printed circuit board specially used for RF circuit design and manufacturing. It has unique characteristics and requirements in high-frequency signal transmission, impedance control, shielding and isolation, miniaturization and high-density wiring.

It is mainly used to process high-frequency signals, usually above 100MHz, and is widely used in wireless communications, radar systems and other application scenarios that need to receive and send wireless signals.

What is microwave PCB?

Microwave PCB (microwave printed circuit board) is a circuit board specially designed to process microwave frequency band signals. Microwave PCB usually works in microwave bands with a frequency greater than 2GHz. It uses a specific microwave substrate copper clad board and is produced through a special manufacturing process to meet the low-loss and low-delay transmission requirements of high-frequency signals. Its characteristics include:

Low loss: Microwave PCB uses materials with low dielectric constants to reduce energy loss during signal transmission.

High stability: stable performance in high temperature and high humidity environments, ensuring reliable signal transmission.

Low latency: suitable for high-speed data transmission needs, ensuring signal accuracy and stability.

The frequency range of RF components covers low frequency and high frequency, with unique characteristics and a wide range of application scenarios. As the key foundation for supporting the operation of high-frequency RF components, the characteristics and design of high-frequency PCB directly affect the performance of RF components. From signal integrity to system stability to miniaturization integration capabilities, they are inseparable from the careful design and optimization of high-frequency PCB.

What does the term PWB mean?

PWB refers to Printed Wiring Board, which is a carrier that uses conductors on an insulating substrate to form interconnected circuits between devices. PWB is an important component of electronic equipment and is used to achieve electrical connections between electronic components.

In the field of electronic manufacturing, PCB (Printed Circuit Board) and PWB (Printed Wiring Board) have a close connection and a specific historical evolution. Today, in most parts of the world, PCB and PWB actually refer to the same item, but the term PCB is more commonly used. They are all circuit boards made by laminating one or more layers of copper foil onto a non-conductive plastic panel. Their main function is to provide support and connection for components with conductive tracks.

However, in some countries such as Japan, since PCB happens to be the name of a common poison, polychlorinated biphenyls, in order to avoid confusion, people prefer to use PWB to refer to this circuit board.

Looking back at the development of the electronics manufacturing industry, PWB has been used in the early days of the industry. At that time, the circuit connection method was relatively simple, mainly in the form of point-to-point connection. With the continuous advancement of technology, wires began to cross from one side of the board to the other, and even from one layer to another. The design of circuit boards is no longer limited to simple point-to-point connections, but has been given specific functions to meet the needs of increasingly complex electronic equipment.

In this process, PCB gradually emerged and eventually replaced the traditional point-to-point wiring board. In 1999, the IPC committee made a decision to clarify the unified use of the term PCB in the future, thus establishing the dominant position of PCB in industry specifications.

In the context of modern electronic manufacturing in most parts of the world, PWB can be regarded as the old name of PCB, while PCB has become a common and standard name for bare circuit boards without components. The unification of this term helps the global electronic manufacturing industry to standardize and normalize in terms of technical exchanges, production and manufacturing, and market circulation.

What is a PCB?

PCB, or printed circuit board, is an indispensable and important component in electronic equipment, used to achieve electrical connections between electronic components. It forms electrical connections between electronic components and supports and fixes components by laying conductive copper foil patterned on insulating materials.

PCB mainly consists of the following parts:

Substrate: Usually made of glass fiber or epoxy resin, providing mechanical support and insulation functions.

Conductive layer: Made of copper foil, responsible for transmitting current and signals.

Solder mask: Protects the copper foil of the circuit board from oxidation and prevents short circuits.

Character layer: Marks the position of components on the circuit board for easy assembly and maintenance.

According to the number of conductive layers, PCBs can be divided into the following categories:

Single-sided board: Only one side is a conductive layer, suitable for low-complexity circuits, such as simple home appliances or electronic toys.

Double-sided board: Both sides have conductive layers, suitable for more complex circuits, such as computers, automotive electronics, etc.

Multilayer board: There are four or more conductive layers, connected by internal wires, suitable for highly integrated circuits, such as communication equipment, high-end servers, etc.

What is the difference between PWB and PCB?

PWB (Printed Wiring Board), PCB (Printed Circuit Board), the difference between them is mainly reflected in the following aspects:

1. Origin of the name and emphasis on the meaning

PWB: In the early days, it mainly emphasized the printing of circuits, focusing on forming conductive circuits on the substrate through printing technology to achieve electrical connections between electronic components, and focusing more on the layout and construction of circuits.

PCB: It emphasizes the concept of circuits more, not only including conductive circuits, but also covering various electrical characteristics, signal transmission paths, and circuit function realization in circuit design. It is a more comprehensive term, involving the entire scope from circuit principles to actual physical layout.

2. Historical development context

PWB: It was widely used in the early stages of the development of the electronic manufacturing industry. At that time, electronic equipment was relatively simple, and the circuit was mainly a relatively simple point-to-point connection method. PWB could meet the basic line connection needs and provided a basic support platform for the assembly of early electronic products.

PCB: With the rapid development of electronic technology, the functions of electronic products have become more and more complex. PCB has gradually developed. It is not just a simple line connection, but also incorporates more circuit design concepts and technologies, thus gradually occupying a dominant position in the industry and largely replacing the early PWB.

3. Application scope and industry habits

PWB: Although it is no longer dominant in modern electronic manufacturing, the term PWB may still be used in some specific fields or traditional electronic equipment manufacturing, especially in some cost-sensitive, relatively simple circuit functions and low requirements for the application of new technologies. Some companies or engineers may continue to use the name PWB.

PCB: Currently widely used in the manufacture of various electronic equipment worldwide, PCB has become an indispensable basic component in the electronic manufacturing industry and a common standard term in the industry, which helps to improve the communication efficiency and standardization of the industry.

4. Technical standards and specifications

PWB: Due to its early application background and relatively simple technical characteristics, the relevant technical standards and specifications are relatively basic and simple, mainly focusing on basic circuit printing quality, line width and line spacing, and conduction performance. With the gradual reduction of PWB usage scenarios, the update and development of its technical standards are also relatively slow.

PCB: With the continuous advancement of technology and the continuous expansion of application fields, the technical standards and specifications of PCB have become extremely rich and strict. These standards and specifications are formulated and updated by international organizations (such as IPC – International Electronics Industry Connecting Association) and industry associations in various countries to ensure that the quality and performance of PCB can meet the needs of electronic products in different industries and different application scenarios.

Although there may be no essential difference between modern PWB and PCB in actual physical products, they have the above-mentioned differences and characteristics from multiple dimensions such as the origin of the term, historical development, scope of application, industry habits, and technical standards. In today’s electronic manufacturing industry, PCB is a more commonly used and widely recognized term, representing advanced electronic circuit manufacturing technology and complex circuit design concepts.

What are the common circuit board terms?

PB is the standardized name for bare board, which stands for printed board; PCBA is the abbreviation for printed circuit board assembly. When the PCB is assembled, it is called PCBA or PCB assembly. PCBA has been the term for all assembled circuit boards since the change in 1999. From users to technical committees, PCBA is also the preferred term for assembled boards.

PWA is the abbreviation for printed wiring assembly. It is an old term for PCB assembly or PCBA.

CCA is the abbreviation for circuit card assembly. CCA is the same as PCBA, but CCA is a less used term.

PCA is the abbreviation for printed circuit assembly. PCA is also the same as PCBA and is not common now.

From this we can conclude that PWB, PCB, circuit board are the same thing, referring to bare printed circuit boards; while PCA, CCA, PWA, PCBA are the same thing, referring to assembled circuit boards. Among them, PCB and PCBA are the two most widely used terms.

In short, although PWB, as a printed circuit board, has some subtle differences in terminology from PCB, in essence they are both indispensable basic components in electronic devices. They have witnessed the development of electronic technology together and will continue to play an important role in the future technological wave.

What is high copper thickness PCB?

High copper thickness PCB refers to a printed circuit board that uses thicker copper foil as the conductive material. In the standard PCB manufacturing process, the thickness of the copper foil is usually determined according to the application requirements, but when the thickness of the copper foil is greater than or equal to 3 ounces, this PCB is called a high copper thickness PCB.

Usually compatible with FR-4 dielectric, mainly used for inner layers rather than outer layers, plated through holes (PTH) usually need to be plugged/filled, and careful registration and lamination are required

Common heavy copper PCB thickness:

2 oz (70 microns)
3 oz (105 microns)
4 oz (140 microns)
6 oz (210 microns)
8 oz (280 microns)
10 oz (350 microns)

Application areas of heavy copper PCB:

Automotive electronics: widely used in key electronic devices such as automotive control modules, engine control systems, airbags, etc., because they can withstand high temperature, low temperature, corrosion and other environmental factors.

Power circuit: widely used in power modules, DC-DC converters and high power distribution boards, etc., capable of handling high current and high power requirements.

Industrial control system: used in high power motor drives, automation equipment and large mechanical control to meet the needs of high conductivity and mechanical strength.

Renewable energy systems: used in solar and wind energy systems to ensure stable system operation and reduce failure rates.

What are the advantages of heavy copper PCBs?

High conductivity: High copper PCB uses heavy copper foil as the conductive layer. Compared with ordinary PCB, its conductivity is significantly improved, which can carry larger current, reduce resistance loss and improve circuit efficiency.

High mechanical strength: Due to the increase in the thickness of copper foil, the mechanical strength of high copper PCB is also improved accordingly, which can withstand greater mechanical stress and impact, and is not easy to deform or damage.

Good heat dissipation performance: High copper PCB can quickly transfer heat from the circuit to the surrounding environment, effectively prevent components from overheating and damage, and improve the reliability and service life of the equipment.

What type of copper is PCB?

There are mainly the following types of copper on PCB: red copper, copper clad plate and inner layer copper.

Red copper: Red copper is the earliest material used in circuit boards, and is widely used due to its good processing performance and conductivity. The main component of red copper is copper, and the other components are less, but the disadvantage is that it is easily oxidized and corroded.

Copper clad laminate: Copper clad laminate is a layer of copper foil on an inorganic substrate, usually used for double-sided and multi-layer circuit boards. The copper foil ensures the conductivity and connectivity of the circuit board, while the inorganic substrate provides mechanical strength and heat resistance.

Inner copper: Inner copper is used in multi-layer circuit boards, which are made of multiple layers of inorganic substrate and copper foil. It is usually used in high-density or high-speed design circuit boards, with better signal transmission performance and higher mechanical strength, but the manufacturing cost is higher.

In addition, there are different types of copper foil in PCB, including electrodeposited copper and rolled copper. Electrodeposited copper has a vertical grain structure and a rougher surface, which is suitable for rigid PCB boards; while rolled copper has a horizontal grain structure and a smoother surface, which is suitable for flexible and high-speed circuit boards.

How thick is 2 oz copper on PCB?

The thickness of 2 oz copper is about 70 microns. In PCB design, copper thickness is usually expressed in ounces (oz), and the thickness of 1 ounce of copper is about 35 microns, so the thickness of 2 ounces of copper is about 70 microns.

The copper thickness standard of PCB board is usually expressed in oz/ft² (ounces/square foot) or um (micrometer). The copper thickness of PCB board has an important impact on the performance and stability of the circuit board. The outer copper thickness mainly affects the stability of signal transmission and the ability to resist electromagnetic interference, while the inner copper thickness affects the signal transmission rate and signal-to-noise ratio.

Generally speaking, the thicker the outer copper thickness, the stronger the stability and signal strength of the circuit board, which is suitable for high-frequency and high-speed occasions; while the thinner the inner copper thickness, the more suitable for high-speed transmission signals, and the thicker the inner copper thickness, the more suitable for low-speed transmission signals and high signal-to-noise ratio signals.

Why use heavy copper PCB?

The main reasons for using heavy copper PCB include the following aspects:

Enhanced current carrying capacity: Heavy copper PCB uses a thicker copper layer, which can carry a larger current and reduce resistance and voltage drop. This is especially important for high-power applications or circuits that require high current transmission.

Optimize heat dissipation performance: Copper has good thermal conductivity, and a thicker copper layer can more effectively conduct heat away from hot spots and improve heat dissipation efficiency.

Improve signal transmission efficiency: Thicker copper layers can reduce losses and reflections during signal transmission and improve signal integrity.

Enhance mechanical strength: Thicker copper layers can increase the overall structural strength of PCBs, making them more resistant to physical shock and deformation.

Adapt to complex process requirements: Heavy copper PCBs can meet complex circuit design requirements through special process treatments, such as etching, drilling, gold plating, etc., to ensure the accuracy and reliability of circuit boards during manufacturing.

What is the most common copper thickness for PCB?

The most common PCB copper foil thickness is 35 microns. This thickness of copper foil is suitable for most consumer electronics products, can meet daily current and heat requirements, and has a relatively low cost and is suitable for large-scale production.

How are heavy copper PCBs made?

In the initial stage of making heavy copper PCBs, relatively heavy copper foil materials are selected. These copper foils are usually produced by electrolytic copper. During the electrolysis process, copper foils of different thicknesses can be produced by controlling the conditions of electrolysis, such as current density, electrolyte composition, and electrolysis time.

For situations where thicker copper foil is required, multiple lamination methods are used. Multiple layers of copper foil and insulating substrate materials are laminated according to design requirements, and then the copper foil and substrate are tightly combined through a high-temperature, high-pressure lamination process.

Next, the circuit pattern is manufactured on the outer layer of the heavy copper PCB, usually using a photolithography process. After that, according to the design requirements, holes are drilled on the heavy copper PCB to provide conditions for installing components and connecting circuits.

After the drilling is completed, a metal layer is covered on the hole wall using electroplating technology to achieve a connection between the layers, and a layer of copper foil is electroplated on the hole wall to increase the thickness of the conductor and the surface pad. Next, the dry film and excess copper foil are removed, and chemical etchants are generally used to make the circuit pattern clearer.

Subsequently, the heavy copper PCB is subjected to surface treatment, such as gold plating, tin spraying, etc., to improve welding performance and corrosion resistance. Finally, the finished heavy copper PCB is strictly inspected and tested to ensure that its electrical and mechanical properties are consistent with the design requirements.

Professional Heavy copper PCB manufacturers – BEST Technology

The minimum width and thickness of the heavy copper PCB conductor are mainly determined based on the required current carrying capacity and the maximum temperature rise allowed for the conductor. From the perspective of its size specifications and actual manufacturing process, the routing of the circuit board may not be a regular rectangular shape.

It is worth noting that the thicker copper conductor will significantly increase the overall thickness of the circuit board to a large extent. In terms of manufacturing process, the additive method (electroplating) process has certain advantages over the subtractive method (etching) process, but at the same time, its cost is relatively higher.

BEST Technology process capabilities:

Substrate: FR4/Aluminum

Copper thickness: 4OZ~10OZ

Extremely heavy copper thickness: 20~200 OZ

Contour: Milling, Punching, V-Cut

Solder mask: White oil/Black oil/Blue oil/Green oil/Red oil

Surface treatment: Immersion gold, tin spraying, OSP

Maximum panel size: 580*480mm(22.8″*18.9″)

Heavy copper PCB occupies an important position in the electronics field with its unique characteristics. With high current carrying capacity, good heat dissipation performance, higher mechanical strength and excellent reliability, it has become an ideal choice for many high-demand application scenarios. From power electronics to automotive electronics, from aerospace to medical equipment and communications, heavy copper PCB plays a key role.

What is a CCA Circuit Card Assembly?

A circuit card assembly, often abbreviated as CCA, is a fundamental component in modern electronic devices. It is essentially a populated printed circuit board (PCB). A PCB is a flat board made of insulating material with conductive pathways etched or printed on it. The CCA takes this a step further by having electronic components such as resistors, capacitors, integrated circuits, and connectors mounted and soldered onto the PCB. These components are carefully placed and connected according to a specific circuit design, which enables the board to perform a particular function or set of functions within an electronic system. For example, in a smartphone, the CCA might be responsible for handling the communication functions, power management, or display control.

CCAs are essential in transforming electronic designs into physical devices. Without them, modern technology would lack the precision and functionality we rely on daily. They are not standalone products but rather building blocks for larger systems. Whether in smartphones, automotive controls, or industrial machinery, CCAs ensure devices operate as intended.

Circuit Card Assembly vs. PCB

When comparing a CCA to a PCB, there are several key distinctions. A PCB is the basic platform, typically a flat panel made of non-conductive material like fiberglass epoxy laminate, onto which conductive paths or traces are etched or printed. It serves as the foundation, providing the physical and electrical interconnectivity layout.

On the other hand, a CCA is a more complete and functional entity. It is a PCB that has been populated with various electronic components. These components, such as resistors, capacitors, integrated circuits, and connectors, are carefully mounted and soldered onto the PCB in accordance with a specific circuit design. For example, a PCB for a simple amplifier circuit might just have the etched traces for the signal path, but the CCA would have the actual transistors, resistors, and capacitors attached to perform the amplification function.

In terms of manufacturing, the PCB manufacturing process focuses on creating the board itself. This involves steps like preparing the substrate, imaging the circuit layout, etching the traces, and drilling holes for component mounting. The CCA manufacturing process builds upon this. It requires additional steps such as component sourcing, accurate component placement using pick-and-place machines, and soldering the components to the PCB. The quality of the PCB is vital for the success of the CCA. If the PCB has flaws in its traces, such as breaks or shorts, it can lead to malfunctioning CCAs.

Circuit Card Assembly Diagram

Circuit Card Assembly Design

Designing a circuit card assembly is a meticulous process. It begins with a clear understanding of the product’s purpose and functionality. Engineers follow these steps:

1. Schematic Creation:

The schematic acts as a blueprint, detailing the electrical connections between components. It defines how the circuit should operate.

2. PCB Layout Design:

The layout focuses on arranging components efficiently while ensuring signal integrity. Tools like CAD software help optimize space and performance.

3. Simulation and Testing:

Before physical production, simulations verify that the design meets all specifications. This minimizes errors in the final product.

4. Bill of Materials (BOM):

A BOM lists every component, including specifications and quantities. It ensures all necessary parts are available for assembly.

5. Prototyping:

A prototype is built to test the design under real-world conditions. Any issues are addressed before mass production.

If the prototype are verified, then you can go to next step – PCB mass production.

What is a Circuit Card Assembly Used For?

Circuit card assemblies are used in virtually every electronic application. Below are some examples of their widespread utility:

Consumer Electronics
Medical Equipment
Aerospace and Defense
Automotive Systems
Industrial Automation
Communication Devices
Health-care

Circuit Card Assembly HS Code

What is Circuit Card Assembly HS Code? The Harmonized System (HS) Code for circuit card assemblies is 8538.90, which covers parts suitable for use solely or principally with the apparatus of heading 8537. This classification includes CCAs as essential components in various electronic systems. Correctly identifying HS codes ensures compliance with international trade regulations. Here are some commonly used HS codes in the electronics and circuit board industry:

8534.00: Printed circuits (excluding assembly). This code applies to bare PCBs, which have copper tracks and pads but no mounted components.
8537.10: Boards, panels, and consoles with electronic components for controlling electrical circuits.
8542.39: Electronic integrated circuits, including microprocessors and memory chips, which are often used in CCAs.
8473.30: Parts and accessories for computers, which may include PCBs and CCAs.
9030.90: Parts for measuring or testing instruments, often used for CCA inspection during manufacturing.

Circuit Card Assembly Manufacturers

If you are looking for a relibale circuit card assembly manufacturer, then Best Technology is your best-choice. Best Technology located in Shenzhen and Vietnam, it is a professional PCB and PCBA manufacturer. Our complete CCA manufacturing services are tailored to our customers’ needs in assemblies. We mainly focus on saving our clients time and money by delivering the highest quality box build assembly solutions:

Complete Testing and Burn-In
Pin Through-hole Assembly
Selective Wave Soldering
Conformal Coating
Software Loading
Complete box build for a variety of applications

Why Is the Right Nipper Important for Keyboard PCBs?

A keyboard PCB is a delicate and vital component that connects switches, diodes, and other elements. Unlike regular DIY tasks, working on a PCB requires precision and care. Using an improper tool can:

Damage the PCB traces.
Leave sharp edges that cause short circuits.
Stress or crack the board, making it unusable.

This is why professionals and enthusiasts alike rely on specialized nippers. These tools are designed to cut cleanly and precisely, reducing the risk of damage and ensuring your keyboard functions perfectly.

Best Types of Nippers for Cutting PCB

1. Flush Cut Nippers: Precision at Its Best

What Nipper to Cut Keyboard PCB? Flush cut nippers are the go-to tool for most keyboard enthusiasts. They’re designed to cut leads and wires flush with the surface, leaving no protruding edges.

Key Features:

Flat cutting surface: Allows you to cut components as close as possible to the PCB.

Compact design: Easy to use in tight spaces around small components.

Best For:

Trimming component leads after soldering.

Cutting wires that connect switches to the PCB.

Removing small plastic supports or tabs.

Popular Models:

Hakko CHP-170 Micro Cutter: Known for its precision and affordability.

Xuron 170-II Micro-Shear Cutter: Offers excellent durability and a smooth cutting experience.

If your goal is a clean, professional-looking PCB with no rough edges or excess material, flush cut nippers are the best option. They’re especially useful for those who value aesthetics and functionality in their keyboard builds.

2. End Cut Nippers: Ideal for Thick Components

End cut nippers have a different design compared to flush cutters. The cutting edge is perpendicular to the handle, allowing you to cut thicker components or tabs with ease.

Key Features:

Perpendicular cutting edge: Offers better leverage and control.

Heavy-duty construction: Can handle thicker wires and components.

Best For:

Cutting PCB mounting tabs.

Trimming thicker component leads or wires.

Removing solder joints in hard-to-reach areas.

Popular Models:

Klein Tools 7280: A reliable tool for heavy-duty cutting.

IGAN-330 End Cutting Plier: Offers precision and strength for demanding tasks.

These nippers are perfect for situations where flush cutters might struggle, such as cutting through reinforced sections or thick leads. They provide more power and control, making tough cuts easier and safer.

3. Diagonal Cut Nippers: Versatility and Convenience

Diagonal cut nippers are a versatile tool that can handle a wide range of tasks. Their angled design allows you to access tight spaces while providing a clean cut.

Key Features:

Angled cutting edge: Makes it easier to reach confined areas.

Sharp blades: Ensure a clean and precise cut.

Best For:

Cutting component leads in crowded PCBs.

Trimming wires and cables.

Modifying plastic enclosures or cases.

Popular Models:

KNIPEX Diagonal Cutters: Known for their precision and durability.

Wiha Precision Diagonal Cutters: A favorite among professionals for intricate work.

If you need a versatile tool that can handle various tasks beyond just PCB work, diagonal cut nippers are a great choice. They offer a balance of precision and convenience, making them a valuable addition to any toolkit.

How to Cut a Keyboard PCB Safely?

Cutting a keyboard PCB requires more than just the right tool. Proper technique and safety precautions are equally important. Here are some tips to ensure a smooth and successful cutting process:

1. Select the Right Nipper

Choose a nipper based on the specific task. Flush cutters are ideal for precision work, while end cutters handle thicker components. Diagonal cutters are great for general-purpose use.

2. Inspect the PCB

Before making any cuts, inspect the PCB for reinforcement layers or sensitive components. Some boards have metal or thicker copper layers that require more durable tools.

3. Apply Even Pressure

When cutting, apply even pressure to avoid stressing or cracking the board. Twisting or excessive force can cause damage.

4. Cut at the Right Angle

Position the nipper at the correct angle to ensure a clean cut. For flush cutters, align the flat surface with the PCB for the best results.

5. Clean Up After Cutting

Once the cuts are made, inspect the PCB for any leftover debris or sharp edges. Use a small brush or compressed air to clean the area and ensure there are no loose particles.

Common Mistakes to Avoid

While cutting a keyboard PCB may seem straightforward, there are some common mistakes to watch out for:

1. Using the Wrong Tool

Using regular wire cutters instead of specialized nippers can lead to rough cuts and potential damage.

2. Cutting Too Close

Cutting too close to the PCB can damage traces or solder joints, leading to functionality issues. Always leave a small buffer if unsure.

3. Applying Too Much Force

Excessive force can crack the PCB or damage nearby components. Use gentle, even pressure for clean cuts.

4. Ignoring Safety Gear

Always wear safety glasses to protect your eyes from flying debris, especially when cutting thicker components.

Frequently Asked Questions

1. Can I Use Wire Cutters for PCB Work?

Wire cutters can be used in some cases, but they lack the precision of flush or diagonal cutters. For best results, use tools specifically designed for PCB work.

2. How Do I Know If My Nippers Are Dull?

Dull nippers may leave rough or uneven cuts. If you notice decreased precision or increased effort, it’s time to replace them.

3. What Is the Best Nipper for Beginners?

Flush cut nippers like the Hakko CHP-170 are affordable, easy to use, and provide excellent results, making them ideal for beginners.

4. Can Nippers Be Used for Desoldering?

Nippers can trim excess solder after desoldering but should not replace proper desoldering tools.

5. How Often Should I Replace My Nippers?

Replace nippers when they lose precision or show signs of wear, such as dull blades or misalignment.

Cutting a keyboard PCB may seem like a small task, but it can make a big difference in the final result of your keyboard build. The right nipper ensures clean cuts, preserves the integrity of the board, and enhances the overall functionality of your keyboard.

At Best Technology, we have over 18 years in the PCB cutting and PCB manufacturing. Choose us for your PCB cutting needs and experience the difference in quality and performance.

What Is the Standard PCB File?

The Gerber file is recognized as the industry standard for PCB manufacturing. It serves as the blueprint that fabricators follow to build a PCB. Originally developed by Ucamco, the Gerber format has undergone multiple updates to enhance its functionality. Nowadays, the Gerber file is supported by virtually all PCB manufacturers and CAM (Computer-Aided Manufacturing) tools.

The standard gerber file format can be divided into RS-274 and RS-274X, Gerber X2 (gerber X2 is the latest version). The gerber file in RS-274 format is a separate file from aperture. aperture in RS-274X format is integrated into the gerber file. Generally speaking, a complete PCB Gerber file should include:

Copper layers (top and bottom)
Solder mask layers
Silkscreen layers
Drill files for holes

And below are some common terms used in a PCB file.

.APR Aperture Data
.GKO Keep Out Layer
.GTO Top Overlay
.GBO Bottom Overlay
.GPT Top Pad Master
.GPB Bottom Pad Master
.GTS Top Solder Mask
.GBS Bottom Solder Mask
.GTL Top Layer
.GBL Bottom Layer
.GTP Top Solder Paste
.GBP Bottom Solder Paste
.G1 MidLayer1
.G2 MidLayer2
.G3 MidLayer3
.G4 MidLayer4
.GP1 Internal Plane1
.GP2 Internal Plane2
.GM1 Mechanical1
.GM2 Mechanical2
.GM3 Mechanical3
.GM4 Mechanical4
.GD1 Drill Drawing or NC
.DRL Drill Data
.TXT Drill Position
.DRR Drill Tool size
.LDP Drill Report

What Files Are Needed to Make a PCB?

To manufacture a PCB, several files are required, each serving a unique purpose. The essential files include:

Schematic file

This is the start for PCB design. It shows the connection relation and component symbol of electronic circuit. For example, in a simple schematic diagram of the power supply circuit, it will clearly show the connection between the transformer, the rectifier diode, the filter capacitor and the voltage regulator chip. Through the schematic file, designers can clarify the function and signal flow of the entire circuit, providing the basis for subsequent PCB layout.

PCB design file

This kind of file is generated on the basis of the schematic. It describes in detail the physical size of the PCB, the layer structure (such as 2-layer PCB, 4-layer PCB board, etc.), the component layout, the direction of the line and the holes. Take a four-layer PCB design file as an example, which will clearly indicate the distribution of signal layers, power layers, and ground plane layers. For component placement, it will be accurate to the coordinate position of each chip, resistor, capacitor and other components on the PCB board surface and their placement direction.

Gerber file

These define the copper traces, pads, and component outlines for each layer.

Drilling file

The drill file is used to indicate the drill location and dimensions on the PCB. In multilayer PCBS, the location and size of the holes are very critical. The drilling file tells the PCB manufacturing device exactly where the center coordinates of each hole are and the size of the aperture.

Component coordinate file (.csv or.txt etc.)

The component coordinate File is also known as the “Pick and Place File”, which facilitates PCB assembly plants to perform component placement and plug-in operations.

This file contains the coordinate position of each component on the PCB board (X, Y coordinates), rotation Angle, component package type and other information. In an automated SMT production line, the mounter can accurately pick up the component from the strip and place it in the correct position on the PCB board based on the information in the component coordinate file.

Bill of Materials (BOM)

A listing of all components’ details required for assembly, including part numbers, manufacturers, quantities and some marks.

What Is the Difference Between Gerber File and Board File?

A Gerber file is a manufacturing file. It describes the physical layout of the PCB layers, ready for fabrication. In contrast, a board file is a design file used within the PCB design software, such as Altium Designer, Eagle, or KiCad. Their key Differences are:

Gerber File: Used for manufacturing; contains 2D layout data.
Board File: Used for design; editable and contains schematic and layout information.

Manufacturers don’t use board files directly. They need Gerber files to fabricate the PCB.

What Is the Extension for a PCB File?

PCB files come with different extensions based on the software used to design them. Some common extensions include:

.BRD: Used by Eagle and other design tools.
.PCB: Common for Altium Designer and some older software.
.GBR: The standard extension for Gerber files.
.PcbDoc: Native to Altium Designer for saving PCB projects.

Each extension represents a different type of file, but they all contribute to the PCB design process.

How to Open a .PCB File?

How to open a .PCB file? Opening a .PCB file depends on the design software it was created with. Firstly, you should determine the software used to create the file. Common tools include Altium Designer, Eagle, and KiCad. Let’s take Altium as an example:

1. Install the Software: If you don’t have this software on your windows, please download and install the corresponding software firstly.

2. Open the File: Use the “Open” option within the software to load the .PCB file.

3. Choose the .PCB file what you want to open, and click “open”

4. Then you can check the PCB file by Altium Designer.

If you don’t have access to the original software, you can use a viewer like Gerbv or an online PCB viewer to inspect the file. However, these viewers may only provide a limited preview of the file and cannot edit it.

How Do I Convert a .PCB File to PDF?

Converting a .PCB file to a PDF is useful for sharing designs with clients or team members who don’t have design software. Here’s a simple way to do it with Altium Designer:

1. Open the .PCB File

Open a .PCB file; Click “File” → “Smart PDF(M)” in the toolbar successively, and the “Smart PDF Wizard” page pops up, as shown in FIG. 1 and FIG. 2 below;

(FIG.1)

(FIG.2)

2. Export as PDF

In the smart PDF screen, click “Next” to enter the configuration selection screen for output PDF – including the following:

1). “Export Target File” + storage path and name of the output PDF file;

2). Whether to export the BOM table: If this parameter is selected, select the BOM table template. If it is not selected, click Next to go to the next step.

3). Set PDF printing parameters, according to the Settings of this page to determine the output of the entire PCB file or output a specific layer of files separately;

4). Set the “color” of PDF, there are “Color”, “monochrome”, “gray” options can be selected;

“Color” option means the PDF file is output in accordance with the original color of each layer;
“Monochrome” means the actual output of the file is all black;
“Gray” means the actual output of the file is all gray display;

Below I choose the “Monochrome” option:

3. Enter “Print” and save the PDF: Choose a location and save the file.

Above are the end of this sharing, whether you’re dealing with Gerber files, board files, or converting formats, I hope this post is useful for you. If you have any other questions, welcome to e-mail with us at sales@bestpcbs.com, we are happy to help you.

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