This specification covers the performance requirements for NPN, silicon, low power, ultra-high frequency transistors. Four levels of product assurance (JAN, JANTX, JANTXV and JANS) are provided for each device type. Two levels of product assurance (JANHC and JANKC) are provided for unencapsulated devices as specified in MIL-PRF-19500. RHA level designators “M”, “D”, “P“, “L”, “R”, “F”, “G”, and “H” are appended to the device prefix to identify devices, which have passed RHA requirements.