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March 2004

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Subject:
From:
"Wenger, George M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sat, 27 Mar 2004 14:49:54 -0500
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Paul,

You're not going to find any information on statistical occurrences of
Black-Pad events.  Those that have had them don't want to talk about
them.  It's almost impossible to quantify how prevalent the problem is.
Certainly if your board fabricator does a poor job of controlling ENIG
you'll see more occurrences. I know of three occurrences of Black-Pad in
my former company (Lucent) over a five year period and one occurrence in
my current company (Andrew) in the past three years.  If I were to take
the number of occurrences and divide by the number of boards the
prevalence would be well down in the noise.  However, when your customer
finds out that his customer's communications or internet system when
down because a component fell off your board, your customer gets
emotional and that one event is too much.  If you haven't experienced
that one event yet it's hard to believe that immersion silver is a
better way to go.  I'm biased.  Eight years ago I believed that
immersion silver was a better way to go to insure reliability and
product quality and our experience has substantiated that belief.  There
are two kinds of immersion silver users that I know of.  One kind has
done their homework and decided that immersion silver works and the
other kind of immersion silver user is they type that just can't stand
another Black-Pad event.

Regards,
George
George M. Wenger Andrew Corporation
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Truit
Sent: Saturday, March 27, 2004 10:03 AM
To: [log in to unmask]
Subject: [TN] Black Pad Prevalence

I have searched the archives and have found lot's of good info but
nothing in regard to the prevalence or the statistical occurrences of
this event.

I have run tens of thousands of ENIG boards and I haven't observed this
defect but I am concerned enough to ask.  Is this a board fabricator
controllable issue that has been minimized?

Have you observed this phenomenon?  How often will this occur?  Is
immersion silver the better way to go to assure the reliability and
quality of the products?
--
Paul Truit, Mfg. Eng.
RBB Systems, Inc.
4265C E. Lincolnway
Wooster, OH  44691
Ph. (330) 567-2906 ext 514
Fax (330) 263-5324
Email: [log in to unmask]

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