1N4979

Single Zener Diodes Overview

The Microchip Technology 1N4979 is a military-qualified, voidless hermetically sealed glass Zener diode rated for 5 watts of power dissipation. It provides a nominal Zener voltage of 75 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and features an axial lead 'E' package construction. Key electrical characteristics include a maximum reverse leakage current of 2 µA at 56 V, a Zener impedance of 55 Ohms at the test current of 20 mA, and a forward voltage of 1.5 V at 1 A.

Single Zener Diodes Feature Summary

• Military qualification per MIL-PRF-19500/356 for high-reliability applications
• Voidless hermetically sealed glass package with internal metallurgical bonds
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military electronic circuits
• Critical voltage regulation in harsh environments

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military grade (e.g., JAN, JANTX, or JANTXV) as suffixes define the quality level. Confirm compliance with MIL-PRF-19500/356 standards. Ensure the ordering suffix aligns with the desired tolerance and packaging configuration before procurement.

Single Zener Diodes Selection Notes

Select this component when a robust, hermetically sealed Zener regulator is required for extreme temperature environments up to 175°C. The 5W rating supports significant power handling. Verify that the 75V breakdown voltage and 55 Ohm impedance meet the circuit design specifications for the intended load conditions.

Single Zener Diodes Part Context

This component belongs to the industry-standard 1N4954 through 1N4996 series of 5-watt Zener diodes. These devices are widely recognized for their durability and consistent performance in demanding sectors. The series offers a broad selection of voltage ratings from 3.3V to 390V, all sharing the same robust mechanical and thermal construction profile.

Single Zener Diodes Replacement Considerations

JAN1N4979, JANTX1N4979, JANTXV1N4979