This specification covers the performance requirements for a N-channel, enhancement-mode, MOSFET, radiation hardened (total dose and single event effects (SEE)), power transistor. Two levels of product assurance (JANTXV and JANS) are provided for each encapsulated device. Two levels of product assurance (JANHC and JANKC) are provided for each unencapsulated device. Three levels (R, F and G) of radiation hardness assurance (RHA) are provided for product assurance levels JANTXV, JANS, JANHC, and JANKC.