1N4731UR

Overview

The Microchip Technology 1N4731UR is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V with a standard tolerance of 10%. The device supports a maximum power dissipation of 1 W and operates within a temperature range extending up to 175 °C. Electrical characteristics include a dynamic impedance of 9 Ω and a test current of 58 mA. The component utilizes a surface mount DO-213AB package, offering high-density mounting capabilities suitable for low parasitic requirements.

Feature Summary

• Provides stable voltage regulation in surface mount configurations
• Features glass hermetic sealing for high reliability applications
• Electrically equivalent to JEDEC registered 1N4728A through 1N4764A series

Applications

• High density circuit board voltage regulation
• Low parasitic requirement designs
• High reliability applications requiring source control drawings

Procurement Notes

Verify the specific suffix configuration against official datasheets to ensure compatibility with required voltage tolerances and packaging formats. Confirm RoHS compliance status as it varies by manufacturing batch and suffix designation. Cross-reference electrical parameters such as dynamic impedance and test current with the target application specifications before finalizing procurement decisions.

Selection Notes

Select this component when a 4.3 V reference is needed in a compact surface mount form factor. Ensure the design accommodates the 1 W power dissipation limit at elevated temperatures. Consider the 10% voltage tolerance unless an 'A' suffix variant with tighter 5% tolerance is explicitly required for precision regulation tasks.

Part Context

This part belongs to the 1N47xx series of 1-watt Zener diodes manufactured by Microchip Technology. The series offers extensive voltage selection from 3.3 V to 100 V. The UR suffix indicates a surface mountable version in the DO-213AB package, providing an alternative to traditional axial-lead packages while maintaining similar electrical performance profiles.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4731 variants in DO-213AB or DO-41 packages. Verify pinout compatibility and thermal resistance characteristics when replacing with components from different suppliers to ensure reliable operation.