PCB News - What are the layout requirements of PCB board components?

What are the layout requirements of PCB board components?

In PCB design, reasonable layout of components is a prerequisite for designing excellent PCB circuit diagrams. The layout requirements of PCB board components generally have five aspects: installation, force, heat, signal, and beauty. The following editor briefly introduces these five requirements to you.

1. Installation requirements

That is, in specific applications, the PCB board can be installed smoothly into the chassis, shell, and slot without space interference, short circuit and other faults, and a series of basic requirements for the designated connector in the designated position on the chassis or shell .

2. Force requirements

PCB circuit boardsmust be able to withstand various external forces and vibrations during installation and work. Therefore, the PCB circuit board must have a reasonable shape, and the positions of the various holes (screw holes, special-shaped holes) on the PCB board must be reasonably arranged. Generally, the distance between the hole and the edge of the board should be at least greater than the diameter of the hole.

At the same time, it should be noted that the weakest section of the plate caused by the special-shaped hole should also have sufficient bending strength. In particular, it is necessary to reasonably fix the connectors on the circuit board that directly "extend" from the device shell to ensure long-term reliability.

3. Heating requirements

For components with high power and severe heat generation, in addition to ensuring the heat dissipation conditions, they should also be placed in appropriate locations. Especially in a sophisticated analog system, it is necessary to pay special attention to the adverse effects of the temperature field generated by these components on the fragile preamplifier circuit. Generally, the part with very high power should be made into a module separately, and certain thermal isolation measures should be taken between it and the signal processing circuit.

4. Signal requirements

Signal interference is the most important factor to be considered in PCB board design. The most basic aspects are: the weak signal circuit is separated or even isolated from the strong signal circuit; the AC part is separated from the DC part; the high frequency part is separated from the low frequency part; pay attention to the direction of the signal line; the layout of the ground line; proper shielding and filtering And other measures.

5. Aesthetic requirements

In addition to placing the components in a neat and orderly manner, a beautiful and smooth wiring design is also important. In the case of low performance requirements, the beautiful design of the PCB board can be given priority, which is conducive to improving the product image.

The above is an introduction to the layout requirements of five PCB board components, I hope it will help you in the layout of components.