MIL-PRF-19500-343 Semiconductor Device, Transistor, Npn, Silicon, Low Power, Types 2N2857 And 2N2857Ub, Jan, Jantx, Jantxv, And Jans, Jansm, Jansd, Jansp, Jansl, Jansr, Janhcf, Janhcg, Jansh, Janhc, And JankcThis specification covers the performance requirements for NPN, silicon, low power, ultra-high frequency transistors. Four levels of product assurance are provided for each device type. Two levels of product assurance are provided for unencapsulated devices as specified in MIL-PRF-19500. RHA level designators "M", "D", "P", "L", "R",