Hi Roger,

My copy of IPC-6012 says "coverage and solderable" ( I don't have the J-STD
in front of me.) So like all things that may be a moot point. But two things
bother me more.  1) Every procurment doc I ever received from my customers
state similar requirements to yours and 2) Shouldn't they default to the
Customer s(aka: Your) specification (or better), particulalrly when it is
that reasonable? Why can't they put on more than half a mil?

Steve

----- Original Message -----
From: "Roger Stoops" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, December 06, 2002 08:27
Subject: [TN] Minimum Acceptable Solder Coverage on PCB


> Greetings and Felicitations!
>
> We currently specify a finished solder coverage for pcbs using HASL of
.0003" to .002".  A vendor has stated that (according to IPC-6012, which
refers to J-STD-003) for HASL the range in solder coverage is .00005" to
.0001".  I was under the impression that anything under .0001" was not good
due to the intermetallics from a previous TechNet discussion.  Help!!!
>
> TIA.
> Sincerely,
>
> Roger M. Stoops, CID
> Trimble Navigation Ltd., Dayton, OH, USA
> Ph: 937.233.8921  or  937.233.4574  ext 288
> Fax: 937.233.7511
>
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