1N4740AH

Overview

The 1N4740AH is a glass-passivated junction silicon Zener diode manufactured by Taiwan Semiconductor Corporation. It provides a nominal Zener voltage of 10 V with a tolerance of 5%. The device is designed for through-hole mounting in the DO-204AL (DO-41) axial leaded package. It features a maximum power dissipation of 1 W and operates within a temperature range from -65 °C to +200 °C. Key electrical characteristics include a maximum reverse leakage current of 10 µA, a Zener impedance of 7 Ohms, and a test current of 25 mA.

Feature Summary

• Glass passivated chip junction for enhanced environmental stability
• High thermal performance supporting operation up to 200 °C
• Low leakage current characteristics above 11 V

Applications

• Voltage regulation circuits
• Overvoltage protection systems
• Reference voltage generation

Procurement Notes

Verify the specific suffix 'H' against official datasheets to confirm compliance with RoHS directives and halogen-free status as defined by IEC 61249-2-21. Confirm that the packaging code prefix aligns with the required material specifications, such as green compound or AEC-Q101 qualification if automotive standards are necessary for the application.

Selection Notes

Select this component when a standard 10 V Zener reference is required in an axial package capable of handling high temperatures. Ensure the circuit design accommodates the 7 Ohm dynamic impedance and 1 W power rating. Verify that the 5% voltage tolerance meets the precision requirements of the target application compared to tighter tolerance alternatives.

Part Context

This part belongs to the 1N47xx series of 1-watt Zener diodes widely used in general-purpose electronics. The 'H' suffix typically denotes specific manufacturing attributes regarding materials or compliance, distinguishing it from standard variants like the 1N4740A while maintaining identical core electrical parameters.

Replacement Considerations

Direct substitutes include the 1N4740A from onsemi or Microchip Technology. Cross-reference the 'H' suffix requirements with generic equivalents to ensure environmental compliance matches the original specification.