Originally published at: https://www.protoexpress.com/blog/pcb-solder-mask-clearance-every-engineer-should-know/
PCB solder mask clearance is the space between a copper pad and the surrounding solder resist. It typically ranges from 2 to 7 mil depending on the component. Different parts, such as resistors, BGAs, and ICs, have distinct clearance requirements to ensure efficient soldering. For instance, BGAs need about 3 mil of clearance per side, whereas surface-mount resistors require around 2 to 3 mil. As a circuit board designer, understanding these component-specific rules helps you prevent manufacturing defects like solder bridging, mask peeling, and misregistration. In this article, you’ll learn the importance of solder mask clearance and the recommended values…