Printed circuit soldermask
have a coating that protects the copper from corrosion and reduces the chances of solder shorting between traces or unwanted electrical Controlled impedance contact with possible loose wires. For its function of helping to prevent solder shorts, the coating is called a solder mask. Soldermask is generally green in color but can have different colors: green, red,
Printed circuit board assembly
inner layers would occupy impedance Controlled the space between the components. The increase in the need for multilayer printed circuit boards with more than two, four and especially more than six layers of copper has been concurrent with the adoption of surface mount technology. "Through holes" components are assembled by their legs passing through
Printed circuit board construction
on Controlled impedance a flat surface) that provide electrical connections on that conductive layer. Another manufacturing process adds plated or metallized holes that allow interconnections between layers. PCBs mechanically support electronic components using pads for bonding the component terminals and electrically connect them using traces of one or more layers of copper sheets