1N4746A-T50A

Overview

The onsemi 1N4746A-T50A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 18 V with a tolerance of ±5%. The device is rated for a maximum power dissipation of 1 W and operates within an extended temperature range from -65 °C to +200 °C. Packaged in the DO-41 axial through-hole format, it exhibits a maximum reverse leakage current of 5 µA and a Zener impedance of 20 Ohms at a test current of 14 mA.

Feature Summary

• Provides stable voltage regulation with a nominal 18 V reference point
• Capable of handling up to 1 W of power dissipation
• Operates reliably across a wide temperature spectrum from -65 °C to +200 °C
• Constructed in a glass DO-41 axial package for through-hole mounting

Applications

• General-purpose voltage regulation circuits
• Overvoltage protection stages
• Reference voltage sources in electronic systems

Procurement Notes

Verify the specific manufacturer designation when sourcing this component, as the 1N4746A part number is utilized by multiple semiconductor producers including Central Semiconductor, Vishay, and Microchip. Confirm that the selected unit matches the required electrical parameters and physical package dimensions. Ensure compliance with relevant environmental standards such as RoHS before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring a robust 18 V reference with high thermal stability. The DO-41 package facilitates easy integration into through-hole PCB layouts. Consider the 20 Ohm impedance and 5 µA leakage characteristics when designing precision regulation loops. Verify that the 1 W power rating aligns with the expected thermal load in the target application environment.

Part Context

This component belongs to the standard 1N47xx series of Zener diodes, widely recognized for their reliability in discrete voltage regulation tasks. The 1N4746A variant specifically targets the 18 V segment of this family. Manufactured by onsemi, it adheres to established JEDEC mechanical outlines, ensuring compatibility with standard automated assembly processes and manual soldering techniques used in industrial electronics manufacturing.

Replacement Considerations

Direct parameter-equivalent substitutes include the 1N4746A from Central Semiconductor Corp, Vishay, and Microchip Technology. Other compatible options are available from Nexperia USA Inc. (e.g., 1N4746A,113). Verify that any replacement maintains the same 18 V nominal voltage, 1 W power rating, and DO-41 package form factor.