This specification covers the performance requirements for an N-channel, enhancement-mode, MOSFET, power transistor intended for use in high density power switching applications. Four levels of product assurance are provided for each encapsulated device type as specified in MIL-PRF-19500, and two levels of product assurance for each unencapsulated device type die, with avalanche energy ratings (E_AS and E_AR) and maximum avalanche current (I_AR).