pcb gold fingers

On the computer's memory bar and graphics card, we can see a row of golden conductive contacts, which are called "gold fingers". The Gold Finger (or Edge Connector) in the PCB design and production industry uses the connector connector as an outlet for the board to connect to the external network. Next, let's understand the processing method of the gold finger in the PCB and some details.

Gold finger PCB surface treatment
1. Nickel electroplating: thickness up to 3-50u", because of its superior conductivity, oxidation resistance and wear resistance, it is widely used in gold finger PCBs that require frequent insertion or removal or PCBs that require frequent mechanical friction Above, but because the cost of gold plating is extremely high, it is only used for local gold plating such as gold fingers.

2. Immersion gold: conventional thickness 1u", up to 3u" due to its superior conductivity, flatness and solderability, it is widely used in high-precision PCB boards with buttons, IC, BGA and other designs. For gold finger PCBs that do not require high wear resistance, you can also choose the entire board immersion gold process. The immersion gold process cost is much lower than the electrical gold process cost. The color of the immersion gold process is golden yellow.

PCB gold finger detail processing
   1) In order to increase the wear resistance of gold fingers, gold fingers usually need to be plated with hard gold.

   2) The gold finger needs to be chamfered, usually 45°, other angles such as 20°, 30°, etc. If there is no chamfer in the design, there is a problem; 45° chamfer in the PCB.

     3) The gold finger needs to be processed with a whole piece of solder mask to open the window, and the PIN does not need to be smt stencil;

   4) The minimum distance between the immersion tin and immersion silver pads is 14mil from the top of the finger; it is recommended to design the pad to be more than 1mm from the finger, including via pads;

   5) Do not lay copper on the surface of the gold finger;

   6) All layers of the inner layer of the gold finger need to be cut copper, usually the width of the cut copper is 3mm larger; it can be used to cut copper with half fingers and whole fingers.
If you have PCB to produce, please send Gerber to sales@pcbsky.com.cn .Thank you.


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