1N4979US

Single Zener Diodes Overview

The Microchip Technology 1N4979US is a surface mount Zener voltage regulator with a nominal breakdown voltage of 75 V and a maximum power dissipation of 5 W. It operates within a junction temperature range of -65°C to +175°C. The device features a standard voltage tolerance of ±5%, a test current (IZT) of 20 mA, and a maximum reverse leakage current of 2 µA at 56 V. Its dynamic impedance (ZZT) is 55 Ohms at the test current, while the voltage temperature coefficient is 0.100 %/°C. The component utilizes a D-5B-2 package.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds for high reliability
• Military qualification compliant with MIL-PRF-19500/356 standards
• Inherently radiation hard design suitable for harsh environments
• ESD robustness verified per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Radiation-hardened circuit protection
• Precision voltage regulation in extreme temperature environments

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military qualification level and package style. Confirm compliance with MIL-PRF-19500/356 specifications during acquisition. Ensure the supplier provides documentation validating the hermetic seal and metallurgical bond integrity. Check for any specific environmental testing requirements relevant to the intended deployment scenario.

Single Zener Diodes Selection Notes

Select this component when a 5 W surface mount Zener diode with military-grade reliability is required. The 75 V rating suits applications needing stable reference voltages under varying load conditions. Consider the wide operating temperature range for designs exposed to thermal extremes. Verify that the D-5B-2 footprint aligns with the PCB layout constraints.

Single Zener Diodes Part Context

This device belongs to the 1N4954US through 1N4996US series of surface mount Zener regulators. These components are manufactured by Microchip Technology's Scottsdale Division. The series offers various voltage options from 3.3 V to 390 V, all sharing the same 5 W power rating and hermetic glass package construction designed for demanding industrial and defense applications.

Single Zener Diodes Replacement Considerations

JAN1N4979, JANTX1N4979, JANTXV1N4979