This specification covers the performance requirements for NPN silicon power Darlington, 2N6350, 2N6351, 2N6352 and 2N6353 transistors. Three levels of product assurance (JAN, JANTX and JANTXV) are provided for each encapsulated device type as specified in MIL-PRF-19500/472. One level of product assurance (JANHC) is provided for each unencapsulated device type as specified in MIL-PRF-19500/472.