1N4731A-T50A

Overview

The onsemi 1N4731A-T50A is a silicon planar power Zener diode designed for voltage regulation and reference applications. It features a nominal Zener voltage of 4.3 V with a tolerance of 5%. The device is rated for a maximum power dissipation of 1 W at an ambient temperature of 25°C, with a derating factor of 6.67 mW/°C above this threshold. It operates within a junction temperature range of -65°C to +200°C. The component utilizes a DO-41 axial leaded package, suitable for through-hole mounting. Key electrical characteristics include a maximum reverse leakage current of 10 µA and a Zener impedance of 9 Ohms.

Feature Summary

• Provides stable voltage regulation using silicon planar technology
• Capable of handling high power dissipation up to 1 Watt
• Features wide operating temperature range for harsh environments
• Utilizes robust glass axial leaded construction

Applications

• Voltage reference circuits in precision measurement equipment
• Overvoltage protection stages in power supply inputs
• Clamping applications in signal conditioning paths
• Biasing networks in transistor amplifier stages

Procurement Notes

Verify the specific suffix T50A against the manufacturer's current datasheet to confirm packaging details and compliance status. Ensure the procurement channel provides valid traceability documentation. Confirm that the component meets RoHS and REACH requirements for the intended market. Check for any obsolescence notices or lifecycle changes from onsemi before finalizing orders.

Selection Notes

Select this component when a 4.3 V regulated reference is required in a through-hole design. Consider the 1 W power rating for thermal management capabilities. Evaluate the 5% voltage tolerance against circuit precision needs. Compare the DO-41 package dimensions against available PCB real estate constraints.

Part Context

This part belongs to the standard 1N47xx series of power Zener diodes, widely used in industrial and consumer electronics. The 1N4731A variant specifically targets the 4.3 V segment of this family. The T50A suffix typically denotes a specific tape-and-reel or bulk packaging configuration defined by the manufacturer. This series is known for its reliability and standardized JEDEC outline.

Replacement Considerations

Cross-reference with other manufacturers' 1N4731A parts ensuring identical 4.3 V Zener voltage and 1 W power rating. Verify compatibility of the DO-41 package footprint. Confirm equivalent Zener impedance and leakage current specifications for critical circuit performance.