Hard Gold Plating Hard Electrolytic Gold consists of a layer of gold plated over a barrier coat of nickel. Usually its applied to edge connector

PCBs with Embedded Copper Coin Dissipating heat through a PCB can be done with thermal vias or MCPCB but sometimes thermal vias are not sufficient

Why ENIG is the most popular surface finish in PCB industry ENIG is Electroless Nickel Immersion Gold ( Au / Ni ), contains two layer