The difference between electroplating and resin hole-plugged in PCB processing

PCB hole-plugged is usually used for the second layer of ink (green oil) after the solder mask layer to fill the heat dissipation hole (Termal pad) with the aperture less than 0.55mm. The purpose of hole-plugged in PCB processing is to avoid short circuit caused by tin penetration in the process of passing through the tin furnace, especially in BGA design, maintaining surface flatness, meeting customer's impedance requirements, and avoiding line signal damage when DIP is used for parts.

What is the difference between electroplating and resin hole plugged?

①Different surface

Electroplating hole-plugged is to fill the through hole by copper plating, and the surface of the hole is full of metal, while resin hole-plugged is to fill the through hole wall with epoxy resin after copper plating, and finally copper plating on the resin surface. The effect is that the hole can be conductive, and the surface is free of dents, which does not affect welding.

②Different production process

Electroplating hole-plugged is to fill the through hole directly through electroplating without any gap. After the hole wall is copper-plated, the resin hole-plugged is filled with epoxy resin to fill the hole, and finally the surface is copper-plated.

③Different prices

The oxidation resistance of electroplating is good, but the process requirements are high and the price is expensive. The resin has good insulation and is cheap.