1N4987US

Single Zener Diodes Overview

The Microchip Technology 1N4987US is a surface mount Zener Voltage Regulator with a nominal voltage of 160 V at a test current of 8 mA. It features a maximum dynamic impedance of 350 Ohms and a maximum reverse leakage current of 2 µA at 121.6 V. The device dissipates 5 Watts at an ambient temperature of 140°C, derating linearly to zero at 175°C. Operating and storage temperatures range from -65°C to +175°C. It utilizes a hermetically sealed voidless glass package (E Package or D-5B) with copper end caps.

Single Zener Diodes Feature Summary

• Hermetically sealed voidless-glass construction with internal metallurgical bonds for high reliability
• Military qualified to MIL-PRF-19500/356 standards
• Inherently radiation hard as described in Microsemi MicroNote 050
• Nonsensitive to electrostatic discharge per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability applications where failure cannot be tolerated
• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened electronic systems

Single Zener Diodes Procurement Notes

Verify the specific manufacturer lineage, as this component series was originally produced by Microsemi Scottsdale Division before acquisition by Microchip Technology. Confirm that the part meets the MIL-PRF-19500/356 specification requirements for your intended application. Ensure the ordering suffix matches the required tolerance level, as standard parts have no suffix while tighter tolerances use C or D designators.

Single Zener Diodes Selection Notes

Select the 1N4987US when a 160 V breakdown voltage is required in a surface mount configuration. This component is suitable for designs needing robust thermal performance up to 175°C junction temperature. Consider the 5 Watt power dissipation capability and the specific thermal resistance values provided in the datasheet for heat sink calculations. Verify compatibility with the E Package dimensions during PCB layout.

Single Zener Diodes Part Context

This component belongs to the 1N4954US through 1N4996US series of surface mount Zener diodes. These devices are characterized by their voidless hermetically sealed glass packages and tungsten slugs. The series offers extensive voltage selections ranging from 3.3 to 390 volts, catering to diverse industrial and aerospace voltage regulation needs.

Single Zener Diodes Replacement Considerations

Axial-leaded equivalents such as the 1N4987 are available by deleting the US suffix. Other series members like the 1N4986US (150 V) or 1N4988US (180 V) may serve as adjacent voltage options within the same package family.