Besides excessive voltage or current what can cause power semiconductor failures?
Another common killer of power semiconductors is heat. Not only does high temperature destroy devices, but operation at elevated, non-destructive temperatures can still degrade useful life. Data sheets specify a maximum junction temperature, which is typically between 100C and 200oC for silicon. Most power transistors have a maximum junction rating of 125oC to 150C, the safe operating temperature is much lower.
