1N4749A

Overview

The Lumimax Optoelectronic Technology 1N4749A is a silicon unidirectional voltage regulator diode housed in a JEDEC DO-41 glass package. It provides a nominal Zener voltage of 24V with a tolerance of ±5%. The device supports a maximum power dissipation of 1W and features a low dynamic impedance of 25Ω. Electrical characteristics include a maximum reverse leakage current of 5µA at 18.2V and a forward voltage of 1.2V at 200mA. The junction temperature rating reaches 200°C, ensuring reliability under high thermal stress.

Feature Summary

• Glass passivated junction for enhanced stability
• Low Zener impedance for effective regulation
• High temperature soldering capability up to 260°C

Applications

• Low voltage stabilizers
• Voltage reference circuits
• Surge suppression applications

Procurement Notes

Verify the manufacturer designation matches Lumimax Optoelectronic Technology when sourcing components. Confirm the specific part number includes the standard suffix indicating the required tolerance level. Ensure the package type corresponds to the axial leaded DO-41 configuration. Check datasheet revisions for any updates regarding electrical limits or mechanical specifications before finalizing procurement orders.

Selection Notes

Select this component for designs requiring a precise 24V reference point within a through-hole assembly. The DO-41 package offers robust mechanical mounting options suitable for general-purpose electronics. Consider the 1W power rating when designing heat dissipation strategies. Verify that the operating environment remains within the specified storage and junction temperature ranges to maintain performance integrity.

Part Context

This component belongs to the 1N47xxA series of Zener diodes manufactured by Lumimax Optoelectronic Technology. The series covers a wide range of nominal voltages from 3.3V to 75V, all sharing similar mechanical and electrical construction standards. The 1N4749A specifically addresses the 24V segment of this lineup, providing a standardized solution for voltage regulation tasks across various industrial and consumer electronic applications.

Replacement Considerations

Compatible substitutes include Vishay Semiconductors 1N4749A-TAP and NXP 1N4749A. Verify pinout compatibility and ensure equivalent electrical parameters such as voltage tolerance and power dissipation are met before substitution.