MIL-PRF-19500-168 Semiconductor Device, Thyristors \(Controlled Rectifiers\), Silicon, Types 2N1771A, 2N1772A, 2N1774A, 2N1776A, 2N1777A, 2N1778A, And 2N2619A, Jan, Jantx, And JantxvThis specification covers the performance requirements for PNPN, silicon power, reverse-blocking triode thyristors. Three levels of product assurance are provided for each device type as specified in MIL-PRF-19500.