1N4743UR/TR

Overview

The Microchip Technology 1N4743UR/TR is a surface mount glass Zener diode with a nominal voltage of 13 V and a power dissipation rating of 1.0 W at 25 °C. It utilizes the DO-213AB (MELF) package and offers a standard voltage tolerance of ±5%. The device operates within a temperature range of -65 °C to +175 °C, features a maximum reverse current of 5 µA at 9.9 V, and has a dynamic impedance of 10 Ohms at a test current of 19 mA.

Feature Summary

• Hermetically sealed glass MELF package for high reliability
• Surface mount design suitable for high density mounting
• Inherently radiation hard per MicroNote 050
• ESD nonsensitive construction

Applications

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

Procurement Notes

Verify the specific manufacturer origin, as the part number appears in listings for both Microchip Technology and Microsemi. Confirm RoHS compliance status by checking for the e3 suffix or specific datasheet revision, as non-compliant versions exist within this series. Ensure the TR suffix indicates tape and reel packaging if required for automated assembly processes.

Selection Notes

Select this component when a 13 V reference is needed in a surface mount form factor. The DO-213AB package provides an alternative to axial leads while maintaining electrical equivalence to the 1N4743A registration. Consider the thermal resistance characteristics and derating curves if operating near the maximum steady-state power limits on FR4 substrates.

Part Context

This component belongs to the 1N4728UR through 1N4764AUR series of surface mountable 1 watt Zener diodes. These devices are electrically equivalent to the JEDEC registered 1N4728A through 1N4764A series but utilize the DO-213AB outline instead of the DO-41 package. The series covers Zener voltages from 3.3 V to 100 V.

Replacement Considerations

The 1N4743A is the direct axial lead equivalent. Surface mount equivalents include MLL4743A. SMAJ4743A is available as a plastic body surface mount option.