# PCB Solder Mask Clearance Every Engineer Should Know

**URL:** <https://sierraconnect.protoexpress.com/t/pcb-solder-mask-clearance-every-engineer-should-know/3704>\
**Category:** Design and Layout\
**Tags:** solder-mask-clearanc, solder-mask-opening, solder-mask-expansio\
**Created:** [November 18, 2025, 2:04pm UTC](https://sierraconnect.protoexpress.com/t/pcb-solder-mask-clearance-every-engineer-should-know/3704 "2025-11-18T14:04:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mohamed\_Faheemuddin](https://avatars.discourse-cdn.com/v4/letter/m/4da419/32.png) [@Mohamed\_Faheemuddin](https://sierraconnect.protoexpress.com/u/Mohamed_Faheemuddin)\
**Post date:** [November 18, 2025, 2:04pm UTC](https://sierraconnect.protoexpress.com/t/pcb-solder-mask-clearance-every-engineer-should-know/3704/1 "2025-11-18T14:04:54Z")

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Originally published at: [https://www.protoexpress.com/blog/pcb-solder-mask-clearance-every-engineer-should-know/](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…