1N4731A

Overview

The SMC Diode Solutions 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. It utilizes a DO-41 axial through-hole package, measuring 4.8 mm in length and 2.6 mm in width. Key electrical characteristics include a maximum reverse leakage current of 10 µA at 1 V and a Zener impedance of 9 Ohms. The component is tested at a current of 58 mA.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction.
• Features hermetic sealing in a glass encapsulated body for environmental protection.
• Supports high thermal stability suitable for demanding operating conditions.

Applications

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

Procurement Notes

Verify the manufacturer designation carefully as the 1N4731A JEDEC part number is produced by multiple vendors including NXP, Vishay, Microsemi, and Fairchild. Confirm that the specific batch from SMC Diode Solutions matches the required package dimensions and hermetic sealing specifications. Ensure the procurement documentation explicitly states compliance with the relevant JEDEC registration standards for this component type.

Selection Notes

Select this component when a standard 4.3 V regulation point is required in a through-hole assembly. The DO-41 package offers robust mechanical mounting compared to surface mount alternatives. Consider the 1 W power rating and wide temperature range when designing for environments with significant thermal variations or higher current demands.

Part Context

This component belongs to the widely recognized 1N47xx series of 1-watt Zener diodes. These devices are standardized under JEDEC registrations, ensuring interchangeability across different manufacturers. The 1N4731A specifically targets the 4.3 V segment of this extensive family, which spans voltages from 3.3 V to 100 V.

Replacement Considerations

Direct substitutes include 1N4731A from other manufacturers such as NXP Semiconductors, Vishay Semiconductors, and Microsemi. Verify that replacement parts maintain the same DO-41 package and hermetic glass construction if environmental sealing is critical.