PCBA factory do circuit board impedance reason

PCB circuit board impedance refers to the parameters of resistance and reactance, which hinder the alternating current. Impedance processing is essential in PCB circuit board production. Why does PCBA factory impedance circuit board? Below jing bang electronic xiaobian simple to introduce you.

The electrical components should be connected and installed at the bottom of the PCB, and electrical conductivity and signal transmission should be planned after the connection, so the impedance should be as low as possible, and the resistivity should be below 0.000001 per square centimeter. In the production process of PCB circuit board, there are other processes such as sinking copper, electroplating tin, welding tin and so on. The materials used in these processes should be guaranteed with low resistivity, so that the overall impedance of the circuit board can meet the quality requirements of the product. However, tin plating is the most prone to problems in the whole PCB manufacturing process, which has a great impact on impedance. Electroless tin coating has a big defect -- easy oxidation or delisting, poor brazing, which will make the PCB board difficult to weld, high impedance and lead to poor electrical conductivity and the whole board performance instability.

PCB circuit boards in the conductor will have all kinds of signal transmission, when in order to improve the transmission rate and must improve its frequency, if the line itself due to factors such as etching, laminated thickness, wire width is different, will cause resistance to change, make the signal distortion, resulting in a decline in circuit board using performance, so they need to control the impedance value within a certain range.

The above is shenzhen xinsheng electronic technology co., ltd. to provide you with industry consulting, hope to help you!