1N4981

Single Zener Diodes Overview

The Microchip Technology 1N4981 is a 5-watt Zener voltage regulator diode with a nominal breakdown voltage of 91 V. It operates within a temperature range of -65°C to +175°C and features a maximum reverse leakage current of 2 µA at 69.2 V. The device exhibits a dynamic impedance of 90 Ohms at the test current of 15 mA, with a forward voltage of 1.5 V at 1 A. It utilizes a voidless hermetically sealed glass package with axial leads.

Single Zener Diodes Feature Summary

• Military qualified to MIL-PRF-19500/356 for high-reliability applications
• Hermetically sealed voidless-glass construction with internal metallurgical bonds
• Inherently radiation hard per Microsemi MicroNote 050
• ESD nonsensitive per MIL-STD-750 Method 1020

Single Zener Diodes Applications

• High-reliability aerospace systems
• Military electronic circuits
• Radiation-hardened power regulation
• Critical voltage reference protection

Single Zener Diodes Procurement Notes

Verify that the component matches the specific military qualification level required by the design specification. Confirm the package type corresponds to the intended mounting method, as surface-mount equivalents exist under different part numbers. Ensure compliance with material restrictions applicable to the target deployment environment.

Single Zener Diodes Selection Notes

Select this component when a robust 5-watt Zener regulator is needed for extreme thermal environments up to 175°C. Consider the 91 V nominal rating and 90 Ohm impedance for circuit stability. Evaluate the axial lead configuration against available board space and mechanical stress requirements in the assembly layout.

Single Zener Diodes Part Context

This device belongs to the 1N4954 through 1N4996 series of 5-watt glass Zener diodes manufactured by Microsemi (now Microchip). The series provides a wide selection of voltages from 3.3 V to 390 V. These regulators are designed for demanding applications requiring high reliability and radiation hardness.

Single Zener Diodes Replacement Considerations

Equivalent parts include JAN1N4981, JANTX1N4981, JANTXV1N4981, and JANS1N4981. Surface-mount alternatives are available as 1N4981US or 1N4981US/TR. Verify pinout compatibility and thermal derating curves before substitution.

Single Zener Diodes FAQ

Is the 1N4981 radiation hard?

Yes, the device is inherently radiation hard as described in Microsemi MicroNote 050.

What is the maximum operating temperature?

The junction temperature range is -65°C to +175°C.