Good Day to all,

Hope you can assist with a HASL question (Werner are you out there?)

We are considering some new vendors and they are requesting we reduce our
HASL thickness requirements.
We presently spec 100 to 500 microinches and vendors say they would like to
see 40 to 1000 microinches.
Now the questions:

1. Will 40 microinches cause intermetallic issues?
2. Will 40 microinches cause major shelf live issues?
     Expected shelf life 3mos, 6mos, 1 year for sealed in plastic, low
humidity?
3. Since I am not comfortable with 1 mil of tin/lead should 500 microinches
be enough?


I appreciate you comments (Steve, Dave, everyone).
Thanks in Advance,
FNK


Frank N Kimmey, C.I.D.
Senior PCB Designer
Powerwave Technologies
PH. 916-941-3159
Fax 916-941-3195

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