SOFT GOLD PLATING
Manufacturer, Importer or Master Wholesaler
https://rushpcb.com/soft-gold-plating-2/
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Manufacturers traditionally use a thick layer of soft gold on PCBs for Gold ball wire bonding. This requires plating the Copper traces on the PCB with a layer of Nickel, followed with an electroplated layer of soft Gold, measuring about 30-50 µin in thickness. The properly plated Gold layer forming an excellent surface for wire bonding. Although the method is eminently suitable for fine-pitch Gold ball bonding, it is expensive.
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