Solder Mask Over Bare Copper
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Solder Mask Over Bare Copper, also known under its acronym SMOBC, is a method of finish plating on printed circuit boards (PCBs).
This is done to make the "pads" on PCBs solderable and to protect the bare copper underneath from oxidizing. Several different types of materials may be used, such as tin-lead alloy, silver, nickel, and gold.
