1N4731AUR/TR

Overview

The Microchip Technology 1N4731AUR/TR is a single silicon Zener diode with a nominal voltage of 4.3 V and a tolerance of 5%. It operates in the DO-213AB (SMA) surface-mount package, dissipating up to 1 W. Key electrical parameters include a maximum reverse leakage current of 10 uA, a Zener impedance of 9 Ohms, and a test current of 58 mA. The device supports an operating temperature range from -65 C to +175 C.

Feature Summary

• Provides stable voltage regulation at 4.3 V with tight 5% tolerance for precision circuits.
• Features low reverse leakage current of 10 uA to minimize power loss in standby modes.
• Constructed with high-reliability silicon technology suitable for demanding environments.

Applications

• Voltage reference sources in precision measurement equipment
• Overvoltage protection circuits for sensitive semiconductor inputs
• Clamping applications in signal conditioning pathways

Procurement Notes

Verify the specific manufacturer lot and RoHS compliance status directly with the supplier, as documentation indicates potential variations. Confirm the reel quantity matches production requirements, noting that factory packaging quantities may differ from standard retail units. Ensure the component meets all environmental regulations applicable to your final assembly region before procurement.

Selection Notes

Select this component when a surface-mount Zener diode with a 4.3 V breakdown is required in the DO-213AB form factor. It is appropriate for designs needing high-temperature operation up to 175 C. Compare against through-hole alternatives if board space allows, but prioritize this SMD version for automated assembly processes requiring compact footprints.

Part Context

This part belongs to the standard 1N47xx series of Zener diodes, widely used for basic voltage regulation. The 'A' suffix typically denotes a tighter tolerance band compared to non-suffixed variants. The 'UR/TR' designation indicates it is supplied in a tape-and-reel format for surface-mount technology (SMT) manufacturing lines.

Replacement Considerations

Direct substitutes include other manufacturers' 1N4731A devices in the DO-213AB package, such as Vishay or Rectron equivalents. Verify that replacement parts maintain the same 4.3 V nominal voltage, 5% tolerance, and 1 W power dissipation rating to ensure circuit compatibility.