We have recently received a few memory assemblies from an off-shore vendor
that exhibit a copper or bronze hue to the terminations of the bypass caps.
There are only 2 caps on the assembly, and they both show this anomaly. Very
light scraping exposes good looking terminations just under the surface of
the discoloration. All other terminations and leadframes look fine (TSOPs,
Resistors, Tantalum), just this one component looks 'funny'. In addition,
the board appears clean (to the eye) under high magnification. This is a new
one on me, what could be the cause of this?

Mike McMonagle
PCBA Process Engineering
Telxon Corporation
(713) 307-2443 Phone
(713) 307-2581 Fax
www.telxon.com

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