Commodity Name: Golden Finger Printed Circuit Board for Communication

Brand Name: HFast

Layers: 8L

Board Thickness: 1.60mm

Minimum Hole Size: 0.20mm

Minimum Line Width: 0.10mm

Minimum Line Spacing: 0.10mm

Surface Treatment: Lead free tin spraying+gold finger plating

Color: Green Oil and White Legend

Advantages: Golden finger chamfering adopts CNC internal inclination and Gold Finger Cover with High Temperature Tape and Spray Tin

Brief Introduction of Golden Finger PCB

The golden finger PCB board is a gold-plated conductive contact on the edge of the circuit board, which is electrically connected to other devices by inserting it into a slot. Its surface is composed of numerous golden touch pads, named after its finger like shape, mainly used for signal transmission between hardware such as memory modules, graphics cards, and motherboards.  

‌

Core functions of Golden Finger PCB

The gold finger transmits data and current through conductive contacts, for example, all data and electronic streams of the memory processing unit are exchanged with the motherboard through the gold finger. Its gold plating layer has high conductivity, wear resistance, and oxidation resistance, which can reduce contact resistance and protect internal circuits.  

‌

Manufacturing Process of Golden Finger PCB

Using electroplating technology to cover a gold layer on copper-clad laminates (usually only a few tens of micrometers thick), common processes include:

Electroplated hard gold: The coating has high hardness and is suitable for frequent insertion and removal scenarios, but the cost is relatively high.

Chemical gold plating (ENIG): High cost-effectiveness, but good soldering performance, suitable for non high frequency insertion and extraction scenarios.  

‌

Design Points of Golden Finger PCB

Oblique edge treatment: It is usually designed with a 45 degree beveled edge to avoid damaging the board edge during insertion and removal.

Solder mask treatment: The gold finger area needs to have a window design to avoid solder mask ink falling off and affecting contact.

Chamfering design: Chamfering the contour line can improve the smoothness of insertion and removal, and reduce stress concentration.