1N4763UR-1

Overview

The Microsemi Corporation 1N4763UR-1 is a high-reliability Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 91 V with a tolerance of 10% and a maximum power dissipation of 1 W. The device utilizes silicon as the semiconductor material and is housed in a hermetically sealed glass MELF-2 package, identified by the JEDEC code DO-213AB. This unidirectional component supports an operating temperature range extending up to 150 °C, ensuring stability in demanding environments.

Feature Summary

• Hermetically sealed glass construction ensures environmental protection and long-term reliability
• High-reliability design suitable for critical electronic systems
• Unidirectional configuration provides stable voltage regulation across a broad operating current range

Applications

• Military and aerospace electronic systems requiring high reliability
• Harsh environment industrial equipment
• Critical voltage reference circuits in defense applications

Procurement Notes

Verify that the specific part number matches the required hermetic sealing and package type, as standard plastic equivalents exist within the same family. Confirm that the 10% tolerance aligns with circuit requirements. Ensure compliance with relevant military specifications if the application demands MIL-PRF-19500 screening levels, which may require specific ordering prefixes distinct from the base commercial designation.

Selection Notes

Select this component when hermetic sealing is mandatory for environmental resistance. The MELF-2 package offers a compact form factor compared to traditional axial leads while maintaining robust isolation. Consider the 1 W power rating and 91 V breakdown voltage to ensure compatibility with the target circuit's voltage and thermal constraints before finalizing the design.

Part Context

This component belongs to the 1N47xx series of Zener diodes manufactured by Microsemi. While many variants use plastic DO-41 packages, the UR-1 suffix indicates a specialized hermetically sealed glass MELF-2 construction. This distinction separates it from standard commercial versions, positioning it for applications where moisture ingress or mechanical stress could compromise standard plastic encapsulated devices.

Replacement Considerations

Direct substitutes include other hermetically sealed Zener diodes with identical 91 V ratings and MELF-2 packaging. Verify that any replacement maintains the same hermetic seal integrity and power dissipation capabilities to ensure equivalent performance in high-reliability contexts.