Question

In the process of making PCB, how to determine the PCB material and thickness?

Answer 1

In the process of making PCB, it is very important to choose the appropriate PCB material and thickness, because they directly affect the performance, reliability, cost and manufacturing difficulty of the PCB.

First of all, the selection of PCB materials should be determined based on specific application scenarios and requirements. Common PCB materials include FR4, CEM-1, aluminum substrate, ceramic substrate, etc. Among them, FR4 is a commonly used glass fiber reinforced epoxy resin substrate with good electrical properties, mechanical properties and processing properties, and is suitable for ordinary electronic products. CEM-1 is a composite substrate made of fiberglass cloth and resin. It has good electrical and mechanical properties and is suitable for high-density, multi-layer PCBs. Aluminum substrate is a PCB based on aluminum plate. It has good thermal conductivity and mechanical properties and is suitable for high-power electronic equipment. Ceramic substrate is a PCB based on ceramics. It has high electrical properties, high temperature resistance and corrosion resistance, and is suitable for high-precision and high-reliability electronic equipment.

Secondly, the choice of PCB thickness should also be determined based on specific application scenarios and requirements. Common PCB thicknesses range from 0.5mm to 6.4mm, of which 0.5mm and 1.5mm PCBs are often used in double-sided designs with golden fingers. 1.8mm and 3.0mm are non-standard sizes and need to be determined according to specific design requirements. When selecting PCB thickness, you need to consider the following points: mechanical strength requirements, cost considerations, circuit performance requirements, processing difficulty, etc. Generally speaking, thicker PCBs have better mechanical strength and circuit performance, but are more costly and more difficult to process; thinner PCBs have lighter weight and lower costs, but have lower mechanical strength and circuit performance. Probably worse.

Finally, choosing the appropriate PCB material and thickness requires comprehensive consideration of specific application scenarios and requirements, as well as its own technical strength and production capabilities and other factors. It is recommended that when selecting PCB materials and thicknesses, preliminary evaluation and screening should be conducted first, and then final determination should be made based on factors such as specific design requirements and manufacturing processes. At the same time, it is also necessary to pay attention to factors such as the availability of PCB materials and ease of processing.

Answer 2

Determining PCB material and thickness requires comprehensive consideration of the following factors:

1. Heat and chemical resistance: These properties depend on the material the board is made of. Boards should be selected with a heat resistance of no less than 130°C, and should have properties such as acid resistance, alkali resistance, salt spray resistance, and mold resistance.

2. Machinability: Ensure that the board is easy to drill, cut and bend, and is not prone to cracking.

3. Electrical properties: Boards with high insulation resistance, low dielectric constant and dielectric loss should be selected.

4. Dimensional stability: Boards with good dimensional stability should be selected to ensure that no warping deformation occurs during manufacturing and use.

5. Environmental protection: Boards that meet environmental protection requirements should be selected, such as halogen-free, low-lead, etc.

6. Cost: Factors such as material cost and service life should be comprehensively considered to select boards with high cost performance.

As for the thickness, it needs to be determined according to the specific requirements of PCB design. Generally speaking, the thickness should be selected based on factors such as the purpose of the circuit board, the power of the devices installed, and the manufacturing process. For example, if the design is a single panel, the minimum thickness should not be less than 0.5mm; if it is a double panel, the minimum thickness should not be less than 1.0mm. If larger devices need to be installed, thicker boards should be selected. In addition, if you need to meet certain special manufacturing process requirements, such as using high-precision drilling processes, you also need to choose thicker plates.

To sum up, determining the PCB material and thickness requires comprehensive consideration of the above factors, and the final determination needs to be combined with specific design requirements and manufacturing processes. It is recommended that when selecting PCB materials and thicknesses, preliminary evaluation and screening should be conducted first, and then final determination should be made based on factors such as specific design requirements and manufacturing processes.