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November 2004

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Subject:
From:
"Newland, Scott" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Newland, Scott
Date:
Mon, 22 Nov 2004 17:38:45 -0500
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I'm looking for processes to augment our conformal coating in protecting
non-underfilled BGA's against harsh wet environments (salt fog, condensation,
etc).  Although it hasn't happened yet, I think it's a matter of time before
moisture will penetrate my imperfect conformal coating and start a corrosion
experiment under one of my fine pitch BGAs.  Parylene is a natural, but comes
with its problems and currently would require going to a sub-contractor. Other
suggestions have included thicken our traditional urethane conformal coating and
dispense a fillet around the part, sealing it from the external environment.  We
have done some testing that shows using urethane conformal coating as an
underfill does not lower reliability.

Any suggestions / comments.

Scott Newland
Harris GSCD
E-Mail [log in to unmask]
For a brain teaser try:
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