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What Solder Mask Expansion Value Should You Use? The solder stop mask layer caps off the PCB and provides a protective film over copper on the surface layers. Solder mask needs to be pulled back from landing pads on the surface layer so that you have a surface where components can be mounted and soldered. This removal of the solder mask from a pad on the top layer should extend some distance around the edge of the pad, creating either NSMD or SMD pads for your components. How far back should Read Article
The Semi-Additive Process (SAP) PCB – Burning Questions Semi-Additive Process (SAP) is an additional tool in the PCB fabricators toolbox that supports low volume, high mix applications. Read this article to see the detailed process on how SAP works and how it can be applicable to your next SAP PCB design. Read Article