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Gold Fingers: A Guide to Understanding Gold-Plated PCB Connectors

A prototype PCB's legend assists design engineers in determining the component designators, switch settings and test points of the PCB, which are very important for assembling, testing and servicing them. While there are three separate ways to print a prototype PCB's legend with respect to PCB assembly and production, there are more things that go into the legend. One of those things is gold plating. This article is a brief backgrounder to the gold plating PCB connector process, commonly call gold fingers.

What are gold fingers?

Gold fingers are the common name for gold-plated connectors that run on the edges of a PCB prototype. Since they are gold, long, and thin, they resemble fingers, hence, the name gold fingers.

What materials are used to manufacture gold fingers?


What do gold fingers do?


How are gold fingers applied?

  • Provide an interconnection point for transferring network data.
  • A place for attaching daughter boards or specialized adapters.
  • Connect external components to the prototype PCB.
  • Function as an audio adapter.

Do gold fingers have any unique design specifications?

Yes. This article previously cited that certain specifications depend on the gold finger’s use and application. Beyond that, there are a few design rules that should be adhered to no matter how they are applied, including:
  • Do not locate plated through holes near the gold fingers.
  • The gold fingers should not have solder mask or screen printing near them.
  • Always orient the gold fingers so they face opposite the center of the PCB.









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