1N4479/TR

Single Zener Diodes Overview

The Microchip Technology 1N4479/TR is a 39 V Zener voltage regulator diode with a 5% tolerance, rated for 1.5 W power dissipation in a DO-41 axial lead package. It operates within a junction temperature range of -65 °C to +175 °C and features a maximum reverse leakage current of 0.05 µA at 31.2 V. The device exhibits a dynamic impedance of 30 Ohms at a test current of 6.5 mA and supports a maximum continuous current of 37 mA.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction utilizing internal metallurgical bonds for robust performance.
• Qualified per MIL-PRF-19500/406 standards for high-reliability military applications.
• Inherently radiation hard as described in Microsemi MicroNote 050.

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• High-reliability aerospace and defense circuits where failure cannot be tolerated
• Military-grade electronic systems requiring strict environmental resilience

Single Zener Diodes Procurement Notes

Verify the specific suffix configuration against official datasheets to confirm exact qualification levels and compliance status. Confirm that the requested variant matches the required military or commercial grade specifications before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 39 V reference is required in an axial lead package. Ensure the design accommodates the 1.5 W steady-state power dissipation limits and the specified thermal resistance characteristics under expected operating conditions.

Single Zener Diodes Part Context

This part belongs to the 1N4460–1N4496 series of industry-recognized 1.5 W Zener voltage regulators. The series provides extensive selections from 3.3 to 200 volts with standard 5% tolerance options available in both through-hole and surface mount configurations.

Single Zener Diodes Replacement Considerations

Direct replacements must match the 39 V nominal Zener voltage, 1.5 W power rating, and DO-41 package dimensions. Verify equivalent MIL-PRF-19500/406 qualification if military reliability is required.

Single Zener Diodes FAQ

Is the 1N4479/TR inherently radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.

What is the maximum operating junction temperature for this diode?

The maximum operating junction temperature is +175 °C.