1N4731A

Overview

The onsemi 1N4731A is a single silicon Zener diode housed in a DO-41 glass axial package. It provides a nominal Zener voltage of 4.3 V with a tolerance of ±5%. The device dissipates up to 1.0 W at a lead temperature of 50°C, requiring a derating of 6.67 mW/°C above this threshold. Electrical characteristics include a maximum dynamic impedance of 9 Ω and a leakage current of 10 µA at 1 V reverse bias. It operates within a junction and storage temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction
• Features a hermetically sealed glass body for environmental protection
• Supports high thermal stability with an extended operating temperature range

Applications

• Voltage reference circuits
• Overvoltage protection
• Clipping and clamping applications

Procurement Notes

Verify the manufacturer marking code matches ON Semiconductor specifications. Confirm the package type is DO-41 glass. Ensure the part number suffix aligns with the required packaging format. Check RoHS compliance status if restricted substances are a constraint. Validate that the specific batch meets the electrical parameters listed in the datasheet.

Selection Notes

Select this component when a 4.3 V regulation point is required in through-hole designs. Consider the 1.0 W power dissipation limit and the need for heat sinking or derating at elevated ambient temperatures. The DO-41 package suits standard PCB mounting techniques. Evaluate the 9 Ω impedance for low-current precision requirements.

Part Context

This component belongs to the 1N4728A through 1N4758A series of general-purpose Zener diodes manufactured by onsemi. The series covers a wide voltage selection from 3.3 V to 56 V. These devices are designed for robust performance in industrial and commercial electronics, utilizing established silicon planar technology.

Replacement Considerations

Cross-reference with other manufacturers offering the 1N4731A designation. Verify pinout compatibility and physical dimensions of the DO-41 package. Ensure equivalent electrical parameters, specifically the 4.3 V Zener voltage and 1.0 W power rating.