1N4981US

Single Zener Diodes Overview

The Microchip Technology 1N4981US is a surface mount Zener Voltage Regulator with a nominal voltage of 91 V and a maximum power dissipation of 5 Watts. It features a standard tolerance of ±5% and operates within a temperature range of -65°C to +175°C. The device utilizes a voidless hermetically sealed glass package (SQ-MELF, E or D-5B) with copper end caps finished in Tin/Lead (Sn/Pb). Electrical characteristics include a maximum dynamic impedance of 90 Ohms at the test current of 15 mA and a maximum reverse leakage current of 2 µA at 69.2 V.

Single Zener Diodes Feature Summary

• Hermetically sealed construction using voidless-glass technology with internal metallurgical bonds for high reliability.
• Military qualification compliant with MIL-PRF-19500/356 standards.
• Robust design inherently resistant to electrostatic discharge (ESD) per MIL-STD-750 Method 1020.
• Radiation hard performance suitable for demanding environments.

Single Zener Diodes Applications

• High-reliability electronic systems where component failure is not tolerated.
• Voltage regulation circuits requiring broad operating current stability.
• Military and aerospace applications utilizing military qualified components.

Single Zener Diodes Procurement Notes

Verify that the specific part number matches the required military qualification level and suffix specifications. Confirm compliance with material declarations such as RoHS and REACH requirements relevant to the procurement region. Ensure the ordering documentation explicitly references the correct datasheet revision to guarantee alignment with the specified electrical parameters and mechanical dimensions.

Single Zener Diodes Selection Notes

Select this component when a 5 Watt surface mount Zener regulator with a 91 V nominal breakdown is required. The SQ-MELF package is suitable for automated assembly processes. Consider the thermal resistance and derating curves if the application involves elevated ambient temperatures exceeding the standard case temperature limits defined in the datasheet.

Single Zener Diodes Part Context

This component belongs to the 1N4954US through 1N4996US series of surface mount Zener diodes manufactured by Microsemi (now Microchip Technology). These devices are designed for the Scottsdale Division production line and share common packaging and construction methodologies across the series, offering various voltage options from 3.3 V to 390 V in the same form factor.

Single Zener Diodes Replacement Considerations

JAN1N4981CUS

Single Zener Diodes FAQ

What is the maximum continuous forward current rating?

The maximum continuous forward current is 1.0 A.

How is polarity indicated on the device?

Polarity is indicated by a band marking on the cathode end of the package.