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Mon, 3 Jun 2002 14:52:14 -0700 |
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Phil and John,
I appreciate your replies to my question. I agree this is not an acceptable
condition for any number of reasons. I wonder if it might relate to the
relatively new push for all tin terminations to support lead-free. The
condition of the terminations on these caps looks much more susceptible to
creating loose metal debris than caps with fused tin-lead finish.
Ed
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Crepeau, Phil
Sent: Monday, June 03, 2002 9:30 AM
To: [log in to unmask]
Subject: Re: [TN] Extraneous Metal On MLCCs
hi,
in my not so humble opinion, these parts should be scrapped. looks like a
disaster waiting to happen. you should ask the manufacturer of these parts
what caused this condition and ask them why they didn't reject them.
phil
-----Original Message-----
From: Ed Hare [mailto:[log in to unmask]]
Sent: Monday, June 03, 2002 8:22 AM
To: [log in to unmask]
Subject: [TN] Extraneous Metal On MLCCs
Fellow Technetters,
I recently found extraneous metal on the surface of several MLCCs on an
assembly. I examined stock parts and found this condition pre-existed on
the stock caps (tape & reel). These caps have pure tin terminations. There
is a picture of this condition at the link below ...
http://www.eskimo.com/~ehare/MetOnCap.bmp
What is your opinion of the acceptability of this condition?
What might be the root cause?
Are there any specifications that address this issue?
Best regards,
Ed
--
SEM Lab, Inc.
Scanning Electron Microscopy
and Failure Analysis
Snohomish, WA
Ph. (425)335-4400
Fax (603)658-4519
http://www.semlab.com
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