with your kind of application, I'll stay with parylene.  Too much at a
stake...
                          my 1.86 cents
                                    jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Newland, Scott
Sent: Monday, November 22, 2004 5:39 PM
To: [log in to unmask]
Subject: [TN] BGA Environmental Protection


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:
http://pao.gsfc.nasa.gov/science.html
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