1N4473

Single Zener Diodes Overview

The Microchip Technology 1N4473 is a military-qualified, void-less hermetically sealed glass Zener diode with a steady-state power dissipation of 1.5 W. It features a nominal Zener voltage of 22 V and a standard tolerance of ±5%. The device operates within a junction temperature range of -65 °C to +175 °C. Electrical characteristics include a maximum dynamic impedance of 14 Ohms at the test current of 11.5 mA, a maximum reverse current of 0.05 µA, and a continuous regulator current of 65 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using void-less hard glass with tungsten slugs for high reliability.
• Qualified per MIL-PRF-19500/406 standards for JAN, JANTX, JANTXV, and JANS levels.
• Robust internal metallurgical bonds ensure resistance to mechanical stress and failure.

Single Zener Diodes Applications

• High-reliability aerospace systems where component failure is not tolerated.
• Military electronic circuits requiring radiation hardness and ESD robustness.
• Voltage regulation in harsh environments with broad operating temperature ranges.

Single Zener Diodes Procurement Notes

Verify the specific reliability level (JAN, JANTX, JANTXV, or JANS) required for the application, as this determines the qualification standard. Confirm RoHS compliance status if applicable, noting that commercial versions may differ from military specifications. Ensure ordering suffixes match the desired tolerance and packaging format before finalizing procurement.

Single Zener Diodes Selection Notes

Select the 1N4473 when a 22 V reference is needed in a 1.5 W axial lead package. Consider tighter tolerances (±2% or ±1%) by adding specific suffixes if precision is critical. Evaluate thermal derating requirements based on ambient temperature and lead length to ensure the 1.5 W rating is maintained safely.

Single Zener Diodes Part Context

This component belongs to the 1N4460–1N4496 series of 1.5 W Zener diodes manufactured by Microsemi (now Microchip Technology). The series provides extensive voltage selections from 3.3 V to 200 V in a DO-41 package. These devices are industry-recognized for their use in demanding applications requiring hermetic sealing and strict adherence to military performance standards.

Single Zener Diodes Replacement Considerations

Direct substitutes must meet MIL-PRF-19500/406 qualifications. Verify pinout compatibility with the DO-41 package and confirm equivalent electrical parameters, specifically the 22 V Zener voltage and 1.5 W power rating.