1N4749AHR1G

Overview

The 1N4749AHR1G is a single silicon Zener diode manufactured by Taiwan Semiconductor. It features a nominal Zener voltage of 24 V with a tolerance of ±5%. The device is designed for through-hole mounting in the DO-41 (DO-204AL) axial leaded package. It has a maximum power dissipation of 1 W and operates within a temperature range of -55 °C to +150 °C. Key electrical characteristics include a maximum reverse leakage current of 5 µA, a Zener impedance of 25 Ω, and a test current of 10 mA. The component holds AEC-Q101 qualification.

Feature Summary

• Glass passivated junction construction for enhanced stability
• AEC-Q101 qualified for automotive reliability standards
• Built-in strain relief in the DO-41 package

Applications

• Voltage regulation circuits
• Voltage reference applications
• Overvoltage protection

Procurement Notes

Verify the specific suffix HR1G against the manufacturer's official datasheet to confirm packaging details and compliance status. Confirm availability directly with Taiwan Semiconductor or authorized distributors as stock levels fluctuate. Ensure the procurement channel provides valid traceability documentation for the AEC-Q101 qualification.

Selection Notes

Select this component when a 24 V Zener voltage with 5% tolerance is required in a through-hole configuration. The 1 W power rating and wide operating temperature range make it suitable for general-purpose regulation. Verify that the DO-41 package dimensions fit the target PCB layout and that the 25 Ω impedance meets circuit sensitivity requirements.

Part Context

This part belongs to the 1N47xx series of glass-passivated silicon Zener diodes from Taiwan Semiconductor. These components are standardized axial-lead devices widely used in low-voltage regulator designs. The 1N4749A variant specifically targets the 24 V segment of this family, offering a balance of voltage precision and power handling in a compact DO-41 housing.

Replacement Considerations

Cross-reference with other manufacturers' 1N4749A parts, such as Vishay or NXP, ensuring identical 24 V nominal voltage, 1 W power rating, and DO-41 package compatibility. Verify that substitute components also meet the required 5% tolerance and thermal specifications.