1N4731UR/TR

Overview

The Microchip Technology 1N4731UR/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB package. It provides a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%. Electrical characteristics include a test current of 58 mA, maximum dynamic impedance of 9 Ω at IZT, and maximum reverse current of 10 μA at 1 V. The device supports a maximum regulator current of 217 mA and withstands surge currents up to 400 mA. Operating temperatures range from -65°C to +175°C.

Feature Summary

• Hermetically sealed glass MELF package for high reliability applications
• Electrically equivalent to JEDEC registered 1N4728 thru 1N4764 series
• Leadless design suitable for high density mounting
• Inherently radiation hard per MicroNote 050

Applications

• Voltage regulation in high density circuits
• Applications requiring low parasitic requirements
• High reliability systems specified by source control drawings

Procurement Notes

Verify the specific suffix configuration against official documentation before procurement. Confirm that the 'TR' suffix indicates tape and reel packaging as defined in the datasheet. Ensure compatibility with RoHS compliance requirements if applicable, noting that 'e3' suffixes denote RoHS compliant devices. Cross-reference the manufacturer's current part numbering conventions to avoid ordering errors.

Selection Notes

Select this component when a 1.0 W surface mount Zener diode with a 4.3 V breakdown voltage is required. The DO-213AB package offers an alternative to axial leads for space-constrained designs. Consider the ±5% tolerance standard unless tighter specifications are needed. Verify thermal derating curves for steady-state power dissipation based on ambient temperature and mounting conditions.

Part Context

This part belongs to the 1N4728AUR through 1N4764AUR series of surface mount glass Zener diodes. The series covers Zener voltages from 3.3 V to 100 V. These devices are electrically similar to the traditional 1N4728A through 1N4764A registrations but utilize the DO-213AB outline. The series includes options for various tolerances and screening standards.

Replacement Considerations

The 1N4731AUR is the direct electrical equivalent without the tape and reel suffix. Surface mount equivalents such as MLL4731A may be considered. Axial leaded versions like 1N4731A are electrically similar but differ in package type.