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March 2004

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 31 Mar 2004 16:41:24 EST
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Hi All!

I'm just wondering if I'm missing something. Is there any performance reason
whatsoever, that requires solder mask over Tin/Lead instead of using SMOBC
(Solder Mask Over Bare Copper)?

Got a board in receiving inspection that I got called back to look at because
the mask was failing tape test. When I saw the board, it was solder mask over
Tin/Lead, just like it was called out on the drawing. The mask had already
lost adhesion in a few places, but we hadn't done anything to it yet
assembly-wise...

I see didn't see this particular boards drawing before we went out and bought
it, otherwise I would have thrown-up a red flag then. What suprised me
though, is that our fab vendor didn't say anything before they built it. Is anything
other than SMOBC being used regularly. I thought solder mask over Tin/Lead
was ancient stuff, and that everybody learned not to do that anymore...

-Steve Gregory-

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