1N4749AH

Overview

The 1N4749AH is a silicon Zener diode manufactured by Taiwan Semiconductor Corporation, designed for voltage regulation applications. It features a nominal Zener voltage of 24 V with a tolerance of ±5%. The device is housed in the DO-41 (DO-204AL) axial leaded package and supports a maximum power dissipation of 1 W. Key electrical characteristics include a maximum reverse leakage current of 5 μA at 18.2 V and a Zener impedance of 25 Ω. The component operates within a temperature range of -55 °C to +150 °C.

Feature Summary

• Hermetically sealed glass passivation for environmental protection
• High thermal stability suitable for demanding environments
• Low leakage current characteristics for precision regulation

Applications

• Low voltage stabilizers
• Voltage reference circuits
• Overvoltage protection

Procurement Notes

Verify the specific suffix 'H' against the manufacturer's official datasheet to confirm if it denotes a specific tape-and-reel packaging variant or a distinct quality grade compared to the standard 'A' suffix. Ensure the procurement documentation explicitly references Taiwan Semiconductor Corporation as the source to avoid generic equivalents that may lack identical hermetic sealing specifications.

Selection Notes

Select this component when a robust, through-hole Zener diode with a 24 V nominal rating is required. The DO-41 package provides reliable mechanical mounting for industrial equipment. Consider the 1 W power dissipation limit and the need for adequate heat sinking or PCB copper area to maintain junction temperatures within the specified operating range during continuous operation.

Part Context

This part belongs to the standard 1N47xx series of one-watt Zener diodes, widely used in general-purpose electronics. The 'H' suffix typically indicates specific packaging or handling attributes defined by Taiwan Semiconductor, distinguishing it from other variants like the 1N4749A while maintaining core electrical performance parameters consistent with the series.

Replacement Considerations

Direct substitutes include the 1N4749A from manufacturers such as onsemi, NXP, Vishay, and Continental Device India Limited. Verify that replacement parts meet the same 24 V, 1 W, and DO-41 package requirements.