1N4992US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4992US/TR is a military-qualified, surface-mount Zener voltage regulator with a nominal breakdown voltage of 270 V at a test current of 5 mA. It features a 5 W power dissipation rating and a standard 5% voltage tolerance. The device operates within a junction temperature range of -65°C to +175°C and utilizes a voidless hermetically sealed glass package (D-5B). Key electrical limits include a maximum reverse leakage current of 2 µA at 25 V and a dynamic impedance of 800 Ω.

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 and resistant to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace and defense circuits
• Critical voltage regulation where failure is not tolerated
• Harsh environment electronics requiring extended temperature operation

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing origin against the latest official datasheet before integration. Confirm that the ordering suffix matches the required tolerance and packaging configuration. Ensure compliance with relevant military specifications and environmental requirements for the intended deployment.

Single Zener Diodes Selection Notes

Select this component for applications requiring robust surface-mount voltage regulation in extreme thermal conditions. The D-5B package facilitates automated assembly while maintaining high power handling. Consider the specific leakage and impedance characteristics when designing precision reference circuits.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5-watt Zener regulators. These components are designed as direct surface-mount replacements for traditional axial-leaded equivalents, offering identical electrical performance in a compact form factor suitable for modern PCB layouts.

Single Zener Diodes Replacement Considerations

Direct axial-leaded equivalents exist within the same series by removing the US suffix. Verify pinout compatibility and mechanical footprint differences when substituting with non-surface-mount variants.