PCB Gold fingers are the gold-plated columns that you see along the connecting edges of printed circuit boards (PCBs). Used for inserting a card slot into contact with a metal spring piece in the card slot. In addition, the gold finger is to protect the printed circuit board prototypes from wear and tear.
Gold finger detail processing in PCB:
1) In order to increase the abrasion resistance of gold fingers, gold fingers usually require hard gold plating.
2) Gold fingers need to be chamfered, usually 45 °, other angles such as 20 °, 30 °, etc.
Problems if there are no chamfers in the design
3) The gold finger needs to be treated as a whole piece of solder resist window, and the PIN does not need to open the steel mesh;
4) The minimum distance from the top of the finger to the pad of Shen Tin and Shen Silver is 14mil; recommended design
When the pad is more than 1mm away from the finger, including via pads;
5) Do not lay copper on the surface of gold fingers;
6) All layers of the inner layer of the gold finger need to be copper-cut, usually the width of the copper is 3mm larger;
You can cut copper with half fingers and copper with whole fingers. In the pci-e design, it also refers to
All copper in the finger area of Ming gold should be cut off;
The resistance of the gold finger will be relatively low. Cutting copper (hollowing under the finger) can reduce the gold finger.
The difference between the impedance and the impedance line is also good for ESD;