1N4987US/TR

Single Zener Diodes Overview

The Microchip Technology 1N4987US/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 160 V and a test current of 8 mA. It features a maximum dynamic impedance of 350 Ohms at the test current and 1650 Ohms at 1 mA. The device supports a maximum continuous current of 29.4 mA and a surge current of 0.7 A. Rated for 5 Watts power dissipation, it operates within a junction temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless glass construction with internal metallurgical bonds
• Military qualification per MIL-PRF-19500/356 for high-reliability applications
• Inherently radiation hard design

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify the specific revision level and manufacturing origin when sourcing this component. Confirm that the supplier provides traceability documentation required for military-grade parts. Ensure the ordering suffix matches the exact package and tolerance requirements specified in the design. Check for any RoHS or environmental compliance declarations relevant to the procurement region.

Single Zener Diodes Selection Notes

Select this component for applications demanding hermetic sealing and radiation hardness. The 160 V rating suits mid-to-high voltage regulation tasks. Consider the thermal resistance and derating curves for high-power environments. Verify that the surface mount footprint aligns with the PCB layout constraints.

Single Zener Diodes Part Context

This part belongs to the 1N4954US through 1N4996US series of 5 Watt Zener diodes. These devices are characterized by their robust glass encapsulation and metal slug construction. They are designed to replace older axial-leaded equivalents while providing superior mechanical stability for surface mount assembly processes.

Single Zener Diodes Replacement Considerations

Direct replacements include other variants within the 1N4954US-1N4996US series from Microsemi/Microchip. Verify pinout compatibility and ensure the substitute meets the same MIL-PRF-19500/356 qualification standards.