PCB manufacturer make pcb circuit board impedance reasons

The impedance of the PCB board refers to the resistance and the parameters of the reactance, which hinder the AC. Impedance processing is essential in PCB board production. Why do PCBA manufacturers have to make impedance to the pcb board? The following FASTPCBA PCBmanufacturer introduce to yousimply.

The bottom of the PCB circuit board should be plugged and mounted with electronic components. After pcb manufacturer plugging, the conductive performance and signal transmission performance should be planned. Therefore, the impedance is lowerthe better, and the resistivity should be less than 0.000001 per square centimeter.

In the production process of PCB circuit boards, there are also technics process linkssuch as immersioncopper, electroplating tin, and soldering of connectors. The materials used by pcb mnaufacturer in these links must ensure low resistivity, so that the overall impedance of the circuit board can meet the quality requirements of the products.

Tin plating is the most prone to problems in the entire PCB circuit board manufacturing process. This part has a great impact on the impedance. The electroless tin plating layer has a large defect - easy oxidation or deliquescence, poor solderability, which makes the PCB circuit board difficult to solder, and the impedance is too high, resulting in poor conductivity and instability of the entire board.

There will bevarious signal transmissions in the conductors of the PCB circuit board. The pcb manufacturer must increase its frequency in order to increase its transmission rate. If the circuit itself is different due to etching, laminate thickness, wire width, etc., the impedance value will change. The signal is distorted, resulting in decreaseperformance of the board, so the pcb manufacturer needs to control the impedance value within a certain range.