what is the influence of temperature on microelectronic device failure mechanisms?

Answer 1

Typical operation temps are -40 to 85 degrees C.

Excessive temperature is the main culprit in the failure of micro electronic controls or devises. It can be caused by the ambient temperature or by excessive current through the devise or by insufficient heat sinking.
Proper operation of these devises require precise molecular ordering of the semiconducting materials, and excessive heat breaks these bonds down and usually short circuits the junctions.