Here is more background on MLCC
http://www.calce.umd.edu/whats_new/2001/design.pdf

Dave Fish

----- Original Message -----
From: "Ed Hare" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 03, 2002 8:21 AM
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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