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July 2003

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Subject:
From:
Paul Signorelli <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 10 Jul 2003 09:56:29 -0500
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Has anyone done any Interconnect Stress Testing on PWB's ?

There is an article by Ron Carter (Alion Science & Technology Corp) in
The Journal of the Reliability Analysis Center, this month (Second
Quarter).
and a history at  http://www.pwbcorp.com or
http://www.pwbcorp.com/FrameDoc.html

It is a highly accelerated  test using special coupons and high current
trace/PTH heating with forced air cooling.

My question is: Is this test a predictor of long term reliability and
within the design limits of a PWB
or is it just a method to find exceptionally good PWB's that exceed
design requirements ?

HALT and HASS can be designed to operate parts above rated limits and
precipitate 'failures' that are just parametric failures because the
test exceeds the manufacturers rating. (That is a process of finding the
better parts by operating them above their design limits).


Paul Signorelli

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