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June 2011

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 20 Jun 2011 15:53:11 -0500
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Hi Phil - the solderability of a pwb is typically accountable for 12 
months as tested per the IPC-JSTD-003 specification. After 12 months, you 
are own your own - some finishes will last longer, some will not and it 
all depends on the initial quality of the applied surface finish and the 
type of longer term storage experienced. Having boards that were stored 
for 24  months  means that the solderability may not be acceptable.

Dave Hillman
Rockwell Collins
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Phil Bavaro <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
06/20/2011 12:12 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
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Subject
[TN] Using PWBs instead of test coupons to meet IPC-6012 Class 3






I recently came across a situation where PWBs were used in lieu of test
coupons to meet a contractual 3rd party micro-section test requirement
for IPC-6012 Class 3 hardware. 

This decision was made after having the PWBs stored in the stockroom for
two years. 

I was asked to get involved when the PWB "coupon" failed for
Solderability testing by the 3rd party test house.

I checked and the original PWB micro-section report from the fabricator
indicated that the test coupons all passed at the time of manufacture.

So I am left wondering about the requirement that is intended by 6012 to
use test coupons.

I would have thought at the very least, the PTH hole locations of PWB
which would correspond to the test coupon sections would have to have
been identified and approved. 

I can rationalize why the stored board would not meet Solderability
requirements after two years in a stockroom, but I cannot get past the
requirement to use actual test coupons for acceptance testing.

Am I missing something or do we have a choice whether to test the
coupons vs the actual PWB? 




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