1N4746AHR1G

Overview

The Taiwan Semiconductor Corporation 1N4746AHR1G is a single silicon unidirectional Zener voltage regulator diode designed for through-hole mounting in the DO-41 (DO-204AL) axial leaded package. It features a nominal Zener voltage of 18 V with a tolerance of ±5% and a maximum power dissipation of 1 W. Key electrical parameters include a test current of 14 mA, a maximum dynamic impedance of 20 Ω, and a maximum reverse leakage current of 5 μA. The device operates within a temperature range of -65°C to +200°C.

Feature Summary

• Provides stable voltage regulation at a nominal 18 V level using a single silicon junction configuration.
• Engineered for high thermal stability with an extended operating temperature range up to 200°C.
• Constructed in a robust DO-41 axial leaded package suitable for reliable through-hole circuit integration.

Applications

• Voltage reference circuits requiring precise 18 V stabilization
• Overvoltage protection stages in electronic systems
• General-purpose voltage regulation in industrial equipment

Procurement Notes

Verify that the specific part number suffix HR1G corresponds to the required RoHS compliance status and packaging format, as manufacturer specifications may vary by production batch or regional regulatory requirements. Confirm the package type matches the intended PCB footprint before procurement.

Selection Notes

Select this component when a 1 W power rating and 18 V regulation are required in an axial package. Ensure the application current does not exceed limits defined by the 1 W dissipation capability at the expected ambient temperature. Verify that the ±5% tolerance meets the circuit's precision requirements.

Part Context

This component belongs to the standard 1N47xx series of Zener diodes, widely used for basic voltage regulation tasks. The 1N4746A variant specifically denotes the 18 V version within this family, manufactured by Taiwan Semiconductor Corporation for general discrete semiconductor applications.

Replacement Considerations

Compatible substitutes include the onsemi 1N4746A and Microsemi 1N4746AUR-1. When replacing, ensure the alternative part maintains the same 18 V nominal voltage, 1 W power rating, and compatible package dimensions for mechanical fit.