What is a PCB Surface Finish and Why is it Important?

When designing or manufacturing a printed circuit board (PCB), much of the attention understandably goes to layout, components, and electrical performance. However, an often-overlooked decision that plays a critical role in reliability, manufacturability, and long-term performance is the printed circuit board (PCB) surface finish. This protective layer is applied to the exposed copper areas of a PCB. It ensures the board’s pads remain solderable and resistant to environmental damage such as oxidation. If you’re working on PCB prototype projects in Singapore or scaling into PCB assembly, understanding surface finishes is essential.