This specification covers the performance requirements for two electrically isolated, matched NPN radiation hardened silicon transistors as one dual unit. Four levels of product assurance (JAN, JANTX, JANTXV, and JANS) are provided for each encapsulated device type, and two levels of product assurance (JANHC and JANKC) are provided for each unencapsulated device, as specified in MIL-PRF-19500. Provisions for radiation hardness assurance (RHA) to eleven radiation levels (“E”, “K”, “U”, \"M\", \"D\", \"P\", \"L\", \"R”, “F”, “G” and “H”) are provided for JANTXV, JANS, JANHC, JANKC, JANHCD, and JANKCD product assurance levels.