1N4739A

Overview

The Microchip Technology 1N4739A is a single silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 9.1 V with a tolerance of 5%. The device is rated for a maximum power dissipation of 1 W and operates within a temperature range from -65 °C to +175 °C. Key electrical characteristics include a maximum reverse leakage current of 10 µA, a Zener impedance of 5 Ohms, and a test current of 28 mA. It utilizes an axial DO-41 glass package.

Feature Summary

• Provides stable voltage regulation through controlled Zener breakdown characteristics.
• Constructed with a glass encapsulated body for environmental protection.
• Designed for through-hole mounting in standard axial configurations.

Applications

• General purpose voltage reference circuits
• Overvoltage protection stages
• Power supply regulation modules

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the 1N4739A part number is utilized by multiple semiconductor vendors including onsemi, Rectron, and Diodes Inc. Ensure the selected component matches the required thermal and electrical specifications for your design. Confirm RoHS compliance status and packaging type directly with the supplier prior to procurement.

Selection Notes

Select this component based on its 9.1 V nominal voltage rating and 1 W power handling capability. Consider the 5% voltage tolerance and 5 Ohm impedance for precision requirements. Verify that the operating environment stays within the specified -65 °C to +175 °C junction temperature range. Ensure the DO-41 axial package fits the available board space and mounting constraints.

Part Context

This component belongs to the widely recognized 1N47xx series of Zener diodes, which are standardized for general-purpose voltage regulation. The 1N4739 variant specifically targets the 9.1 V segment of this family. While Microchip Technology produces versions of this part, the industry-standard part number is shared across various manufacturers offering equivalent performance profiles.

Replacement Considerations

Equivalent parts include the 1N4739A manufactured by onsemi, Rectron, and Diodes Inc. These components share identical electrical ratings and mechanical dimensions. Verify pinout compatibility and thermal characteristics before substitution.