1N4743AUR/TR

Overview

The Microchip Technology 1N4743AUR/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 13 V with a standard tolerance of ±5%. Electrical characteristics are defined at a test current (IZT) of 19 mA, featuring a maximum dynamic impedance (ZZT) of 5 Ohms and a maximum reverse leakage current (IR) of 5 µA at 9.1 V. The device supports a maximum regulator current (IZM) of 344 mA and withstands a maximum surge current (IS) of 700 mA. Operating temperatures range from -65°C to +175°C.

Feature Summary

• Hermetically sealed glass MELF package for high reliability applications
• Surface mount design suitable for high density mounting
• Inherently radiation hard per MicroNote 050
• Electrically equivalent to JEDEC registered 1N4743A

Applications

• Voltage regulation in high density circuits
• High reliability applications requiring source control drawings
• Low parasitic requirement designs

Procurement Notes

Verify the specific manufacturer origin, as the part number history involves transitions between Microsemi and Microchip Technology. Confirm that the 'TR' suffix indicates tape and reel packaging per EIA-481-B standards. Ensure compliance requirements match the intended application environment, particularly regarding RoHS status and hermetic sealing specifications.

Selection Notes

Select this component when a 13 V reference is required in a surface mount form factor. The DO-213AB package offers lower parasitics compared to axial leads. Consider the thermal resistance of 130°C/W junction-to-ambient on FR4 boards for power derating calculations. Verify that the ±5% voltage tolerance meets circuit precision needs.

Part Context

This device belongs to the 1N4728AUR through 1N4764AUR series of surface mount Zener diodes. Originally documented under Microsemi Scottsdale Division, these parts are electrically similar to the traditional DO-41 axial equivalents but utilize the leadless DO-213AB outline. The series covers Zener voltages from 3.3 V to 100 V.

Replacement Considerations

The 1N4743AUR/TR is electrically equivalent to the 1N4743A registration in the DO-41 package. Surface mount equivalents such as SMAJ4743A are also available within the broader product family.