1N4731AP/TR8

Overview

The Microsemi Corporation 1N4731AP/TR8 is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 4.3 V with a tolerance of 5%. The device operates in a DO-204AL (DO-41) axial through-hole package and dissipates up to 1 W of power. Key electrical parameters include a maximum reverse leakage current of 10 µA at 1 V, a Zener impedance of 9 Ohms, and a test current of 58 mA. It supports an operating temperature range from -65 °C to +150 °C.

Feature Summary

• Provides stable voltage regulation within the 1N4728A to 1N4764A series specifications
• Utilizes plastic encapsulation for moisture classification Level 1 without dry pack requirements
• Offers lower thermal resistance compared to glass-body variants in the same JEDEC numbering

Applications

• General purpose voltage regulation circuits
• Reference voltage sources in electronic systems
• Overvoltage protection stages

Procurement Notes

Verify the specific manufacturer designation as Microsemi or its successor entities like Nexperia or Microchip Technology, as production rights and part numbers may have transferred. Confirm RoHS compliance status, as standard AP suffixes often indicate non-compliant versions requiring separate e3 suffix verification. Check for obsolescence notices or end-of-life declarations before finalizing procurement plans.

Selection Notes

Select this component when a 4.3 V regulated reference is required in a through-hole configuration. Ensure the circuit design accommodates the 1 W power dissipation limit and the specified 5% voltage tolerance. Consider the DO-41 package dimensions for board layout compatibility and verify that the operating temperature range meets the environmental requirements of the target application.

Part Context

This part belongs to the widely recognized 1N47xx series of 1-watt Zener diodes. These components are standardized across multiple semiconductor manufacturers, providing extensive voltage selection options ranging from 3.3 V to 100 V. The 1N4731 variant specifically targets the 4.3 V segment of this broad regulatory spectrum.

Replacement Considerations

Cross-reference with other manufacturers' 1N4731A parts. Verify pinout and package compatibility with DO-41 standards. Check if military screening prefixes are required for specific reliability needs.