What Are Gold Fingers?
Gold fingers are the gold-plated columns that you see along the connecting edges of Printed Circuit Boards (PCBs). The purpose of gold fingers is to connect a secondary PCB to the motherboard of a computer.
PCB Gold Fingers are also used in various other devices that communicate via digital signals, such as smartphones and smartwatches. Gold is used for the connecting points along a PCB because of the alloy’s superior conductivity.
Other names to call a Gold finger PCB are Gold Connector, Edge Connector, Edge-Board Connector, Connector Finger, Contact Fingers, Gold Taps or Gold Tips.
Gold Fingers PCB Board
The gold finger bevel default value: 45 angle, As following figure. The default plating for gold finger does not support the hard gold.
How are gold fingers applied?
Gold fingers can be used for many different things. Their use would be based on the designer’s purpose. Some common applications of gold fingers are:
- 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.
Are there specific design specifications?
Yes. As we mentioned previously, there are some specifications depending on the need and use of the board. However, despite this, there are some design rules that must be followed no matter the board’s intended purpose. This includes:
- No plated through holes can be included anywhere near the gold fingers.
- No soldermask or screen printing can be included near the gold fingers.
- The gold fingers should always be placed facing outward of the board’s center.
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