I am getting differing information from different suppliers of PWB's with
regard to solder thickness requirements after HASL. Some say 100 to 500
u-inches, others say 500-800 u-inches and yet others say 1200-3000 u-inches
(.0012" to .003"). We are looking for 6 months to one year of solderability
with storage being in an air-conditioned environment with well less than
saturation humidity in the stockroom. (Generally temp is in the 70 to 75
deg F range, relative humidity 50 percentish +/- 10 percentage points.)

Can some one tell me what the height of the "normal" intermetallics is on a
HASLed SMT pad and how much additional solder coating is needed to prevent
deterioration of the solderability of the pads?

Thanks all,

Charlie B.

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