4 Layer Prototype Golden Finger PCB with UL US&Canada

4 Layer Prototype Golden Finger PCB with UL US&Canada

♦ What's Golden Finger PCB?

Golden Finger PCB refers to a printed-circuit board whose edge carries a row of gold-plated contact pads. These pads (the “fingers”) are inserted into a mating connector to provide a low-resistance, corrosion-free, high-wear path for power and high-speed signals between boards or sub-systems.

♦ Key Points of Gold Finger PCB?

1. Structure

• Located on the board edge; can be single- or double-sided
• 3–6 µm nickel under-layer + 30–100 µin (0.75–2.5 µm) hard gold (Au-Co or Au-Ni alloy)
• 20°–45° bevel is normally ground on the tip to ease insertion and reduce abrasion

2. Function

• Acts as a pluggable edge connector that can survive ≥1 000 insertion/removal cycles
• Provides excellent conductivity (<10 mΩ contact resistance) and long-term oxidation resistance

3. Typical uses

RAM modules (DDR4/DDR5), graphic cards, PCIe cards, disk-drive carriers, industrial backplanes, USB sticks, smart-card sockets—any application where a sub-board must be quickly and repeatedly connected to a motherboard or backplane

4. Manufacturing note

After solder-mask, only the finger area is exposed; nickel is electroplated first, then hard gold; finally the edge is bevelled. The rest of the board can receive any normal surface finish (ENIG, OSP, etc.)

♦ Technical Parameters

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4 layer golden finger PCB

UL certified prototype PCB

US Canada compliant PCB

4 Layer Prototype Golden Finger PCB with UL US&Canada Images