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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