1N4746AH

Overview

The 1N4746AH is a single Zener diode manufactured by Taiwan Semiconductor, designed for through-hole mounting in DO-41-2 packages. It features an 18 V nominal Zener voltage with a 5% tolerance and operates at a test current of 14 mA. The device dissipates up to 1 W of power and maintains a maximum reverse leakage current of 5 uA. Its dynamic impedance is specified at 20 Ohms. The component supports an operating temperature range from -55 C to +150 C and holds AEC-Q101 qualification.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• Automotive-grade reliability via AEC-Q101 qualification
• Low leakage current characteristics for stable regulation

Applications

• Voltage reference circuits
• Overvoltage protection systems
• Power supply regulation

Procurement Notes

Verify the specific suffix AH against official datasheets to confirm package dimensions and marking codes. Confirm RoHS compliance status and REACH SVHC declarations directly with the manufacturer or authorized distributors before procurement. Ensure the ordering quantity aligns with factory packaging requirements.

Selection Notes

Select this component when a hermetically sealed, automotive-qualified Zener diode is required for high-reliability applications. Verify that the 18 V breakdown voltage and 1 W power dissipation meet circuit requirements. Consider the DO-41-2 package size for PCB layout constraints and thermal management needs.

Part Context

This part belongs to the 1N4746AH series of low-voltage regulator diodes. These components are widely used in industrial and automotive electronics where long-term stability and resistance to harsh environments are critical. The series offers various voltage options within a standardized package format.

Replacement Considerations

Cross-reference with Vishay 1N4746A or Nexperia 1N4746A for similar specifications. Verify pinout compatibility and ensure equivalent voltage tolerance and power ratings before substitution.