MIL-PRF-19500-523 Semiconductor Device, Transistor, Npn, Silicon, Power Darlington Types 2N6383, 2N6384, 2N6385, Jan, Jantx, And JantxvThis specification covers the performance requirements for NPN silicon, power Darlington transistors. Three levels of product assurance are provided for each device type as specified in MIL–PRF–19500.