1N4746A_S00Z

Overview

The onsemi 1N4746A is a single-channel general-purpose Zener voltage regulator diode designed for through-hole mounting in the DO-41 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. The device operates within a temperature range of -65°C to +200°C, ensuring reliability under extreme conditions. Key electrical characteristics include a maximum reverse leakage current of 5 µA at 13.7 V and a Zener impedance of 20 Ω measured at a test current of 14 mA.

Feature Summary

• Provides stable voltage regulation using a single unidirectional silicon junction
• Capable of handling high thermal loads up to 200°C junction temperature
• Constructed in a hermetically sealed glass DO-41 axial package

Applications

• Voltage reference circuits requiring stable DC levels
• Overvoltage protection stages in electronic systems
• General-purpose clipping and clamping applications

Procurement Notes

Verify the specific manufacturer marking against official datasheets, as multiple vendors produce this standard part number. Confirm RoHS compliance status and packaging type (bulk or reel) prior to ordering, as these attributes vary by supplier. Ensure the procurement source provides traceability documentation matching the required quality standards for your application.

Selection Notes

Select this component when a robust 18 V regulation point is needed in high-temperature environments. The DO-41 package offers superior thermal performance compared to smaller surface-mount alternatives. Verify that the circuit's operating current remains within the specified test current limits to maintain accurate voltage regulation and prevent excessive power dissipation.

Part Context

This component belongs to the widely recognized 1N47xx series of 1 Watt Zener diodes. The 'A' suffix typically denotes a ±5% voltage tolerance. While the base part number is standardized across the industry, specific manufacturing details such as lead plating composition and exact thermal resistance values may differ between onsemi and other authorized distributors.

Replacement Considerations

Compatible substitutes include the Vishay 1N4746A, Microchip 1N4746A, and Taiwan Semiconductor 1N4746A. These parts share identical electrical ratings and mechanical dimensions. Ensure the replacement maintains the same DO-41 package style and verify that any alternative meets the required operating temperature range.