1N4746A-T

Overview

The Vishay 1N4746A-T is a single silicon planar Zener diode housed in the DO-41 glass axial leaded package. It provides an 18 V nominal Zener voltage with a 5% tolerance at a test current of 14 mA. The device dissipates up to 1.3 W of power and maintains operation across a temperature range from -65 °C to +175 °C. Key electrical characteristics include a maximum reverse leakage current of 5 µA and a Zener impedance of 20 Ω.

Feature Summary

• Hermetically sealed glass axial construction for environmental stability
• High thermal dissipation capability within the DO-41 form factor
• Precise voltage regulation with tight manufacturing tolerances

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in electronic systems
• Clamping applications for transient suppression

Procurement Notes

Verify the specific manufacturer designation, as Vishay acquired General Semiconductor assets. Confirm the exact suffix matches your bill of materials, as variations exist between standard 1W and 1.3W rated versions. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability.

Selection Notes

Select this component when a through-hole solution is required for robust voltage regulation. The DO-41 package offers superior heat dissipation compared to surface-mount alternatives. Verify that the 18 V breakdown aligns with the circuit's operating limits and that the 1.3 W power rating accommodates the expected thermal load.

Part Context

This part belongs to the standardized 1N47xx series of Zener diodes, widely used for general-purpose voltage regulation. The 'T' suffix typically indicates tape-and-reel packaging, facilitating automated assembly processes while maintaining the performance characteristics of the standard axial leaded device.

Replacement Considerations

Equivalent parts include Nexperia 1N4746A and onsemi 1N4746A. These substitutes share identical electrical ratings and DO-41 packaging, ensuring direct pin-to-pin compatibility without circuit modification.