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What should we pay attention to in PCB assembly design?

What should we pay attention to in PCB assembly design?

In the process of PCB assembly and production, PCB design is a crucial link, which is related to the performance and quality of the whole circuit board. Therefore, in the process of PCB design, care should be taken carefully.Avoid mistakes, resulting in post-production failure.So what should you pay attention to in PCB assembly design?The following is an introduction to the analysis by the FASTPCBA technician:

PCB assembly design

PCB assembly design

1. Reasonable trend
In order to prevent the lines from interfering with each other, the route layout should be reasonable.For example, input/output, ac/dc, strong/weak signal, high/low frequency, high/low pressure, etc., their trend shall be linear (or separated) and shall not be merged.In general, the best alignment is a straight line, but not easy to achieve, and the worst alignment is a loop, but the technology is now available to improve through isolation.
2.Choose a good pickup location
The welding plate grounding of PCB assembly is an electrical safety measure to ensure the normal operation and personal safety of electrical equipment.In general, common point, such as forward amplifier of multiple ground lines should be joined before connecting to the main line, and so on.In reality, it is difficult to fully do because of various restrictions, but you should try to follow them.
3. Reasonably arrange power filter/decoupling capacitance
In general, only a few power filter/decoupling capacitors are shown in the schematic diagram, but it is not indicated where they should be connected.In fact, these capacitors are set for switching devices (gate circuits) or other components that need to be filtered/decoupled, and these capacitors should be arranged as close as possible to these components as far away from them as possible.
4. The line and diameter should be reasonable
Generally speaking, the welding board assembled by PCB should not be made into thin wire if it has the condition to make wide wire.The ground should be as wide as possible, preferably with a large area of copper coating, which can also improve the problem of receiving site.If the wire is too thin, and the large area of unwired area is not equipped with copper coating, it is easy to cause uneven corrosion, the thin wire is likely to be overcorroded, or seems to be broken, or completely broken, and cannot be used.For high pressure and high frequency line should be sleek, no sharp chamfer Angle, no right Angle.

5. The bore hole size should be appropriate
If the size of solder pan or wire hole is too small, it will be very inconvenient when manual drilling. If the size of solder pad and drill hole are not properly matched, it will be adverse to CNC drilling, and it is easy to drill the weld disc out of shape, or drill off the pad, resulting in waste.
6. Number of solder joints and wire density through holes
In the initial stage of PCB manufacturing, if there is no control over the number of holes and the density of solder joints and wires, various problems will occur in the later stage.If there are too many wire holes, if the copper sinking process is careless, there will be hidden trouble. Therefore, the wire holes should be reduced as much as possible in the design.The distance of welding spot is too small, which is not conducive to manual welding, and the speed will be reduced during welding, which is not conducive to mass production.
The above is the professional knowledge provided by FASTPCBA. I hope it can help you

9月-30-2018

FASTPCBA