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Date: | Wed, 20 Dec 95 12:23:30 CST |
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The discussion concerning cracked MLC capacitors has by now brought up
a number of possible failure mechanisms which should be considered
when dealing with the problem.
In our experience, cracked capacitor failures had been almost always
found on boards where some type of standoffs or bulkheads were secured
to the boards after electrical components were installed, and/or on
boards which were populated with IC sockets. It was fairly easy to
see that physical stresses were applied to the boards as the
mechanical components and IC's were being installed. What was not so
easy to accomplish was to convince the production people that such
stresses could in fact fracture the capacitors.
Implementing several simple fixture to relieve stresses acting on the
boards took care of our problems very nicely. I can't remember the
last time I saw a cracked MLC capacitor.
Regards,
Myron Papiz
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