What is Gold Finger?
PCB Gold Fingers refer to a row of gold-plated strips at the edge of a PCB, which are commonly used to connect different electronic devices and transmit digital signals, especially in computers for peripheral cards of expansion slots , such as PCI, PCI Express, and AGP cards.
Gold Fingers are normally coated with a layer of gold through an electroplating process. Because gold is extremely resistant to oxidation, it can protect the internal circuit from corrosion; Moreover, its conductivity is also very good, so there is basically no signal loss based on it. At the same time, gold has very strong ductility, the contact area between the contacts can be made larger under proper pressure, thereby improving the signal transmission efficiency.
Why it’s called Gold Finger?
Look at the golden yellow conductive contacts: the surface is gold-plated and the conductive contacts are arranged just like fingers. Alright, you may not think so, but that’s indeed the reason why. Weird but interesting.