This Zener Diode is packaged in DIGI B, which has a power dissipation of 5W. "Available as High Reliability device per MIL-PRF-19500 indicate –HR suffix after the part number. Contact for -HR flow. Add ""PBF"" suffix for Pb-free lead finish."
Zener diodes provide voltage regulation over a broad range of operating voltages, currents and temperatures.