1N4740AUR/TR

Overview

The Microchip Technology 1N4740AUR/TR is a surface mount Zener diode designed for voltage regulation applications. It utilizes the DO-213AA (SMB) package and offers a nominal Zener voltage of 9.1 V with a standard tolerance of ±5%. The device handles a maximum power dissipation of 1 W at ambient temperatures up to +75°C, extending to 175°C in derated conditions. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 8 Ω at the test current of 28 mA.

Feature Summary

• Provides stable voltage regulation through avalanche breakdown in the DO-213AA surface mount package.
• Features glass passivation for reliable operation across extended industrial temperature ranges.
• Designed for high-density circuit layouts with low parasitic requirements.

Applications

• Voltage reference circuits requiring precise potential levels.
• Overvoltage protection stages in sensitive electronic systems.
• Clamping applications within general-purpose power supplies.

Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging when sourcing from distributors. Confirm RoHS compliance status directly with the manufacturer or authorized suppliers, as environmental declarations can vary by production batch. Ensure the ordering quantity aligns with the minimum reel size specified in the official datasheet to avoid partial reel handling fees or availability issues.

Selection Notes

Select this component when a 9.1 V regulation point is required in a compact surface mount footprint. Compare against axial equivalents like the 1N4739A if through-hole mounting is mandatory. Evaluate thermal management needs based on the 1 W power rating and ensure the PCB copper area supports adequate heat dissipation for continuous operation near maximum ratings.

Part Context

This part belongs to the 1N47xx series of 1 Watt Zener diodes manufactured by Microchip Technology. The 'AUR' designation typically denotes the specific voltage variant and surface mount configuration within the broader family of registered Zener regulators. These components serve as fundamental building blocks for biasing and stabilization in analog and digital electronics.

Replacement Considerations

Direct functional substitutes include the 1N4739A for axial packages or other manufacturers' SMB-encapsulated 9.1V 1W Zener diodes. Verify pinout compatibility and thermal resistance values before swapping brands to ensure equivalent performance under identical load conditions.