1N4743ADO41E3

Overview

The Microsemi Corporation 1N4743ADO41E3 is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 13 V with a tolerance of 5%. The device is rated for a steady-state power dissipation of 1 W at ambient temperature and operates within a junction temperature range extending up to +200 °C. It utilizes the DO-41 axial leaded package, providing robust mechanical stability for through-hole mounting. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 10 Ω at the specified test current.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction structure
• Features hermetic glass encapsulation suitable for high reliability environments
• Offers low thermal resistance compared to plastic molded equivalents in the same series

Applications

• Voltage reference circuits requiring stable DC levels
• Protection against voltage transients and spikes in sensitive electronics
• Power supply regulation and clipping applications

Procurement Notes

Verify that the specific suffix 'DO41' confirms the axial leaded package configuration required for your board layout. Ensure the 'E3' suffix indicates RoHS compliance if environmental regulations apply to your manufacturing process. Cross-reference the manufacturer's latest datasheet to confirm the exact test conditions for Zener impedance and leakage current specifications before finalizing component selection.

Selection Notes

Select this component when a standard 13 V regulation point is needed with high reliability requirements. The glass body construction offers superior performance over plastic variants regarding thermal resistance and hermetic sealing. Consider the DO-41 package dimensions for PCB spacing and verify that the 1 W power rating aligns with the expected thermal environment of the application circuit.

Part Context

This part belongs to the JEDEC registered 1N47xxA series of 1 Watt Zener diodes manufactured by Microsemi (now Microchip Technology). The series covers a wide voltage range from 3.3 V to 100 V. The 1N4743A designation specifically identifies the 13 V variant within this extensive lineup of general-purpose and high-reliability voltage regulators.

Replacement Considerations

Equivalent surface mount options are available in the MLL47xxA series (e.g., MLL4743A) for space-constrained designs. Plastic axial equivalents exist as the 1N4743AP series, though they exhibit higher thermal resistance. Verify compatibility with military screening standards if JAN or JANTX prefixes were originally specified.