In PCBA processing, many procedures are more complicated, and sometimes it is easy to increase the production cost if the operation is improper. At this time, it is necessary to make impedance on the PCBA board. At this point, everyone may be curious, what is impedance? The following Sanjing will give you a brief introduction.

PCBA motherboard impedance refers to the hindering effect of resistance and reactance parameters on alternating current. So why do impedances? In the PCB circuit board processing, electrical conductivity, signal transmission and other problems will occur after the electronic components are plugged in. Therefore, the lower the impedance, the better. Generally speaking, the probability of impedance is less than 0.000001 per square centimeter to be qualified. In the actual PCBA motherboard processing process, if the technology is not good or the operation is inaccurate, it will easily lead to an increase in electrical impedance and ultimately lead to circuit board impedance failure.

There are various signal transmission media on the PCBA motherboard. In order to increase its transmission rate, it is necessary to increase its overall frequency. If the impedance value changes due to etching, stack thickness, wire width and other factors during this process, it will also cause signal distortion and degradation of PCBA motherboard performance.

In addition, in the PCB circuit board processing, there are some process links that also need special attention, such as copper sinking, connector soldering, tin electroplating, etc.

Tinning is the most problematic link in the PCBA motherboard processing process, because this link has a great impact on impedance, and chemical tinning has a big defect that is easy to oxidize, deliquescent, and poor solderability, which leads to PCBA motherboard processing. It is difficult to weld and the impedance is too high, which in turn leads to poor electrical performance and unstable overall board performance.

Therefore, the materials required during the operation of these links must be low-resistivity. Only in this way can the electronic enterprises' demand for the overall resistance of the circuit board be met, and the quality of electronic products can be guaranteed.

The above is the reason why PCBA needs impedance, I hope it can be helpful to everyone!