1N4749AT9-E

Overview

The 1N4749AT9-E is a single Zener diode manufactured by Renesas Electronics Corporation, classified under discrete semiconductor products. It operates within the standard 1N47 series and is housed in a DO-41 axial leaded package. The device functions as a voltage regulator diode with a nominal breakdown voltage of 24 V and a maximum power dissipation of 1 W. Key electrical characteristics include a test current of 10.5 mA and a dynamic impedance of 25 Ohms. The component supports an operating temperature range from -65 C to +175 C and features a tolerance series of ±5%.

Feature Summary

• Provides stable voltage regulation through a single unidirectional Zener junction structure.
• Utilizes a hermetically sealed glass passivated construction for environmental durability.
• Supports high-temperature operation suitable for demanding industrial environments.

Applications

• Low voltage stabilizers
• Voltage reference circuits
• Overvoltage protection

Procurement Notes

Verify the specific manufacturer designation on the datasheet, as the 1N4749A part number is widely produced by multiple vendors including NXP and Microchip. Confirm that the 'T9' suffix corresponds to the correct tape-and-reel packaging configuration required for automated assembly processes. Ensure the RoHS status aligns with project compliance requirements before finalizing procurement orders.

Selection Notes

Select this component when a robust 24 V reference is needed in an axial package. The wide thermal range makes it suitable for applications exceeding standard commercial limits. Compare against other 1N4749 variants to ensure the specific manufacturing source meets quality standards. Verify pin compatibility with existing PCB footprints designed for the DO-41 form factor.

Part Context

This component belongs to the broader 1N47xx series of silicon Zener diodes. These devices are standardized for low-voltage regulation tasks across various industries. The specific AT9 variant indicates a particular packaging or processing specification within the Renesas portfolio, distinguishing it from bulk or other reel configurations.

Replacement Considerations

Cross-reference with 1N4749A parts from other manufacturers such as NXP or Vishay. Ensure replacement units maintain the same 24 V nominal voltage and 1 W power rating. Verify that the substitute package matches the DO-41 axial dimensions for mechanical fit.