1N4988US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4988US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 180 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 test current of 5 mA, a maximum reverse leakage current of 2 µA at 100 V, and a dynamic impedance of 450 Ohms at the test current. It utilizes a voidless hermetically sealed glass package with tungsten slugs.

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 non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• High-reliability aerospace systems
• Defense electronics requiring failure-intolerant components
• Radiation-hardened circuit protection

Single Zener Diodes Procurement Notes

Verify that the ordering suffix matches the required military specification level and tape-and-reel packaging format. Confirm compliance with specific environmental requirements and ensure the component meets the necessary radiation hardness levels for the intended operational environment.

Single Zener Diodes Selection Notes

Select this component for applications demanding robust surface mount regulation in extreme thermal conditions. Ensure the design accommodates the specific thermal resistance characteristics and power derating curves defined for the E-package configuration.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5-watt Zener regulators. These devices are designed as industry-standard replacements for axial-leaded versions, offering equivalent electrical performance in a compact surface mount footprint suitable for automated assembly.

Single Zener Diodes Replacement Considerations

Direct axial-leaded equivalents exist within the same series (e.g., 1N4988 without the US suffix). Verify pinout compatibility and mechanical mounting constraints when substituting between package types.