Interesting comments...taking it a bit further, why not stick with
HASL...it is by far the less expensive of the more prominent finishes.

Yes, the OSP process is the easiest to maintain for the fabricator;
however, this finish does not provide for much flexibility to the
assembler, i.e. thermal cycles, risk of contamination, etc. The
immersion tin solves a few of these by increased thermal cycles in
comparison to OSP as well as providing a surface prior to wave/uv solder
that is more forgiving of contaminates found in even the most spot-free
assembly shop. Just those two conditions alone make the immersion tin a
more attractive finish over OSP.

Actually, when the process is well maintained, immersion tin is not much
more costly to the fabricator or the assembler...again, when it is well
maintained and in control.

Franklin

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