1N4731AUR

Overview

The Microchip Technology 1N4731AUR is a surface mount Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%. The device operates in the DO-213AB (SMA) package and dissipates up to 1 W of power. Key electrical parameters include a maximum reverse leakage current of 10 µA, a Zener impedance of 9 Ω, and a test current of 58 mA. It supports a maximum operating temperature of +175 °C and a forward current of 200 mA.

Feature Summary

• Provides stable voltage regulation using silicon Zener breakdown characteristics.
• Utilizes glass hermetic sealing for high reliability and environmental stability.
• Offers surface mount compatibility via the DO-213AB outline for automated assembly.

Applications

• Voltage reference circuits requiring low parasitic effects
• High-density electronic board designs
• General purpose voltage regulation tasks

Procurement Notes

Verify the specific manufacturer source, as this component has been produced by multiple entities including Microsemi and Microchip Technology. Confirm RoHS compliance status and exact suffix designations, as these determine lead-free certification and packaging type. Ensure the supplier provides valid traceability documentation matching the requested manufacturing origin before finalizing procurement orders.

Selection Notes

Select this component when a surface mount solution is required for 4.3 V regulation. The DO-213AB package is suitable for space-constrained layouts. Verify that the 1 W power dissipation rating meets thermal requirements. Consider the ±5% voltage tolerance if tighter precision is not critical. Check availability of equivalent through-hole parts if redesigning existing PCB footprints.

Part Context

This part belongs to the widely recognized 1N47xx series of 1-watt Zener diodes. Originally JEDEC registered, the series offers extensive voltage selection from 3.3 V to 100 V. The 1N4731AUR represents the surface mount variant, electrically equivalent to the axial 1N4731A but optimized for modern SMT production lines and high-reliability applications.

Replacement Considerations

Equivalent surface mount parts include the SMAJ4731A series. For axial replacements, the 1N4731A is the direct electrical counterpart. Verify package dimensions and pinout compatibility when substituting with components from other manufacturers such as Nexperia or Rectron.