Do PCB circuit boards have to be with impedance?

- Feb 13, 2020-

It’s certain the PCB circuit board must be with impedance in the manufacturing process. FASTPCBA introduces the reasons from four points:


1. PCB circuit (board bottom) should consider plug-in installation of electronic components. Consideration of issues such as conductivity and signal transmission after plugging, the lower the impedance, the better. The resistivity should be lower than 1 & TImes; 10 per square centimeter. Below -6


2. During PCB circuit boards production process, it is necessary to go through the process of immersion copper, electroplating tin (or chemical plating, or thermal spraying), connector soldering and other process manufacturing, and the materials used in these links must ensure low resistivity to ensure the overall impedance of the circuit board is low enough to meet product quality requirements and can operate normally.



3. The tinning of the pcb circuit board is the most prone to problems in the production of the entire circuit board, and it is the key link that affects the impedance. The biggest drawbacks of electroless tin plating are easy discoloration (both easy to oxidize or deliquesce), poor solderability, which will make circuit boards difficult to solder, high impedance, poor electrical conductivity or instability of the entire board.


4. There will be various signal transmissions in the conductors of the PCB circuit board. The frequency must be increased in order to increase its transmission rate, if the circuit itself is different due to factors such as etching, stack thickness, and wire width, it will cause the impedance to change to make its signal distorted, leading to the degradation of the performance of the circuit board, it is necessary to control the impedance value within a certain range.


The above information is provided by FASTPCBA. If you have any questions about the circuit board, you can leave a message at any time. Thank you

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