1N4749A_NT50A

Overview

The onsemi 1N4749A is a silicon unidirectional voltage regulator diode housed in a DO-41 glass package. It provides a nominal Zener voltage of 24 V with a maximum tolerance of ±5%. The device dissipates up to 1 W at lead temperatures below 50°C and operates within a temperature range of -65°C to +200°C. Electrical characteristics include a test current of 10.5 mA, a maximum dynamic impedance of 25 Ω, and a leakage current of 5 µA at 18.2 V.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• High thermal stability across extended operating ranges
• Low leakage current for efficient voltage regulation

Applications

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

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm packaging details such as tape and reel or bulk quantities. Confirm RoHS compliance status and date code requirements directly with the manufacturer or authorized distributor before finalizing procurement orders.

Selection Notes

Select this component when a stable 24 V reference is required in through-hole designs. Ensure the circuit design accommodates the 1 W power dissipation limit and derating factors above 50°C. Verify that the ±5% tolerance aligns with the precision requirements of the target application.

Part Context

This part belongs to the 1N4728A through 1N4758A series of low-voltage regulator diodes manufactured by onsemi. The series utilizes a standardized DO-41 axial leaded package and offers a wide range of nominal voltages from 3.3 V to 56 V, providing designers with consistent electrical characteristics across different voltage ratings.

Replacement Considerations

Compatible substitutes include other manufacturers' 1N4749A parts meeting identical DO-41 specifications. Cross-referencing requires matching the 24 V nominal voltage, 1 W power rating, and ±5% tolerance limits.