Safety Folks -

I have a question for the group on the effects of temperature rating and
deterioration.  If a pcb is rated X degrees C, and the sizing of the power
traces on an inner layer is such that the pcb temperature is now (X-1)
degrees C, 

What effect does this have on the longevity of the pcb?
At what %of the temperature board rating X will discoloration occur?

I would appreciate all comments, so please fee free to respond to the group
or to me directly.  Thanks.

Regards,

Mark F. Gill, PE
Sr. Engineer
C-MAC Design Corporation, A Solectron Company
4222 Emperor Blvd, Suite 300
RTP, NC  27703
P: (919)-474-3569
markg...@solectron.com


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