Gold tips or fingers, usually refer to the terminals on a card-edge connector of a PCB.
The application of gold fingers to an edge connector provides an ideal surface finish for high-wear applications, such as an insertion connector. This is partly due to the fact that hardened gold provides a very planar surface that is resistant to wear from repeated insertions. For the manufacture of printed circuit boards, a bright hard gold with a mixture of nickel and/or cobalt is often used for card edge connector fingers plated over a nickel underlayment.
There are several advantages to using Hard Gold compared to other surface finishes for the usability of untreated contact surfaces such as contact points or membrane switches.
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