MIL-PRF-19500-251 Semiconductor Device, Transistor, Npn, Silicon, Switching, Types 2N2218, 2N2218A, 2N2218Al, 2N2219, 2N2219A, And 2N2219Al, Jan, Jantx, Jantxv, Jans, Jansm, Jansd, Jansp, Jansl, Jansr, Jansf, Jansg, And JanshThis specification covers the performance requirements for NPN, silicon, switching transistors. Four levels of product assurance are provided for each device type 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.