I am designing a PCB that uses castellated edges to connect to the parent board. I would like to use HASL finish to save on costs for prototyping, but I am concerned that the non-planar surfaces of the module may pose assembly issues. Is it common at all to use HASL for castellated boards, or do I need ENIG to ensure successful assembly?
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HASL works fine for PTH, even large holes, I see no reason for it to not work with castelation.
It does somewhat bind you to a solder chemistry, (lead or lead-free) and also has a shorter shelf-life than ENIG
answered Aug 2, 2020 at 10:09