Fast thermal fatigue on top metal layer of power devices

摘要

The paper deals with the analysis and the study of rapid temperature variation effects on metal surface of Vipower devices. These Mmos-Dmos smart power mosfets are substituting relays on automotive applications. Their particular characteristics of thermal/max current protection, in overload and/or short circuit condition Produce temperature variation/gradients 9measured by computer aided radiometric techniques), which, if repeated Periodically, generate some fatigue effects o surface metallization. Scaling technologies and consequently Increasing specific power level arise these phenomena (included in Failure Mode category predictable by COFFIN-MANSON model) as a new failure mechanism that needs a life time prediction and assurance criteria.