1N4731A

Overview

The Fairchild Semiconductor 1N4731A 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 is rated for a maximum power dissipation of 1 W and operates within a temperature range of -65°C to +200°C. Packaged in the DO-41G axial through-hole format, it exhibits a maximum reverse leakage current of 10 µA at 1 V and a Zener impedance of 9 Ohms. The component utilizes a glass encapsulation body.

Feature Summary

• Provides stable voltage regulation using a single unidirectional Zener junction.
• Constructed with a glass encapsulated body for environmental protection.
• Designed for through-hole mounting via an axial lead configuration.

Applications

• Voltage reference circuits
• Overvoltage protection stages
• General-purpose voltage regulation

Procurement Notes

Verify the specific manufacturer designation as Fairchild Semiconductor has undergone corporate restructuring. Confirm that the part number corresponds to the original Fairchild specifications rather than subsequent acquisitions by ON Semiconductor or other entities. Ensure the package variant matches the required DO-41G form factor for your assembly process.

Selection Notes

Select this component when a 4.3 V reference point is required with moderate power handling capabilities. The DO-41G package suits standard through-hole PCB layouts. Consider the 5% voltage tolerance and 9 Ohm impedance characteristics against circuit sensitivity requirements. Verify thermal derating needs if operating near the maximum power dissipation limit.

Part Context

This component belongs to the 1N47xx series of 1 W Zener diodes, widely utilized in discrete semiconductor designs. The 1N4731A specifically targets the 4.3 V segment of this family. It serves as a fundamental passive element for establishing fixed potential levels in analog and digital power supply architectures.

Replacement Considerations

Equivalent parts include the NXP/Nexperia 1N4731A,113 and Rectron 1N4731A-B. Vishay offers the 1N4731AD9 variant. These substitutes share identical electrical ratings and DO-41 packaging, ensuring functional interchangeability in standard applications.