MIL MIL-PRF-19500/533J

Semiconductor Device, Diode, Silicon, Voltage Regulator, Types 1N6309 through 1N6355; 1N6309US through 1N6355US, Plus C and D Tolerance Suffix, JAN, JANTX, JANTXV, and JANS
standard by Military Specifications and Standards, 09/04/2007