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Acronym HAL, which is the process of putting solder on exposed copper of the circuit board. Approx. 60/40 Tin/Lead mix is used. Also known as a SMOBC which is an acronym for Solder Mask Over Bare Copper.

PCB Glossary

  • Pad Sizes

    Your outer layer pads need to be 0.017″ larger than the finish tool size (0.010” for vias). Your inner layer pads need to be 0.018″ larger than your finished tool size. If your design has any pad to trace junction minimum requirement, add that to the above numbers [0.017″ pad + 0.002″ junction should have 0.019″ pad].