Layers of a Printed Circuit Board
Silkscreen.
The silkscreen is a screen-printed layer that provides assembly and reference information for the PCB. The silkscreen is usually white text on the green solder mask.
Solder Mask.
The solder mask is responsible for a PCB’s characteristic green color. The mask is a thin polymer coating that protects the traces and prevents solder bridges.
Copper Layers.
Every PCB contains one or more copper layers, including the etched pathways (traces) that form the circuit.
Substrate.
The substrate is a non-conductive material bound to the copper layers. It serves to insulate electrical traces from one another.
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