1N4979US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4979US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 75 V. It operates within a junction temperature range of -65°C to +175°C and dissipates up to 5 Watts at an ambient case temperature of 140°C. The device features a maximum reverse leakage current of 2 µA at 56 V, a dynamic impedance of 55 Ohms at the test current of 20 mA, and a forward voltage of 1.5 V at 1 A. It utilizes a voidless hermetically sealed glass package.

Single Zener Diodes Feature Summary

• Military qualified to MIL-PRF-19500/356 for high-reliability applications
• Voidless hermetically sealed glass construction with internal metallurgical bonds
• Triple-layer passivation for enhanced robustness
• Inherently radiation hard and non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military electronic circuits
• Harsh environment power regulation
• Radiation-hardened equipment

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the TR suffix to confirm tape and reel packaging compliance with EIA-481-B standards. Ensure the procurement documentation explicitly references the MIL-PRF-19500/356 qualification level required for the intended application. Confirm the manufacturer source matches the official datasheet specifications for the Scottsdale Division product line.

Single Zener Diodes Selection Notes

Select this component when a surface mount Zener diode requires military-grade reliability and radiation hardness. The 5 W power rating supports significant current handling in compact layouts. Verify that the 75 V breakdown voltage aligns with circuit requirements and that the D-5B package dimensions fit the available board space constraints.

Single Zener Diodes Part Context

This component belongs to the industry-recognized 1N4954US through 1N4996US series of surface mount Zener regulators. These devices are designed as replacements for traditional axial-leaded packages while providing superior thermal management and physical durability. The series offers extensive voltage selections from 3.3 V to 390 V with standard 5% tolerances.

Single Zener Diodes Replacement Considerations

Public confirmed substitute part numbers include JAN1N4979, JANTX1N4979, and JANTXV1N4979. These variants maintain equivalent electrical parameters but may differ in specific military screening levels or packaging configurations.