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The traditionally green coating which protects copper on PCBs from oxidation and shorting due to solder. Use this tag for PCB design questions and soldering questions which require attention to the mask layer.

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You might want to look into the 'Dog Bone' BGA escape pattern. Basically, the BGA is split into 4 quadrants. Each ball has a single via placed towards the outside of it's respective quadrant. It makes …
answered Oct 30 '18 by Adam