MIL-PRF-19500-413 Semiconductor Device, Transistor, Npn, Silicon, High-Power, Types 2N3771 And 2N3772, Jan, Jantx, And JantxvThis specification covers the performance requirements for NPN silicon, high-power transistors for use in high-speed power-switching applications. Three levels of product assurance are provided for each device type as specified in MIL-PRF-19500.