1N4739UR-1

Overview

The Microchip Technology 1N4739UR-1 is a 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 operates in the SMD/SMT form factor within a DO-213AA-2 package, also known as SOD-80C. It supports a maximum power dissipation of 1 W and functions across an extended temperature range from -65 °C to +175 °C. Key electrical characteristics include a test current of 28 mA, a maximum reverse leakage current of 10 µA, and a Zener impedance of 5 Ohms.

Feature Summary

• Provides stable voltage regulation using a single Zener junction structure.
• Engineered for surface-mount assembly to facilitate automated PCB placement.
• Capable of operation in extreme thermal environments up to 175 °C.

Applications

• Voltage reference circuits requiring precise potential levels
• Overvoltage protection stages in sensitive electronic systems
• General-purpose voltage regulation in industrial equipment

Procurement Notes

Verify the specific manufacturer source, as the 1N4739UR-1 designation appears primarily associated with onsemi in public databases. Confirm that the supplied component matches the Microchip Technology specification sheet regarding the DO-213AA-2 package and 9.1 V rating. Ensure authenticity through official distribution channels to avoid counterfeit parts.

Selection Notes

Select this component when a compact surface-mount solution is required for 9.1 V regulation. The DO-213AA-2 package offers space efficiency compared to axial leads. Verify that the 1 W power rating and high-temperature capability meet the specific thermal design requirements of the target application environment.

Part Context

This part belongs to the standard Zener diode category used for maintaining constant voltage levels. It serves as a fundamental passive semiconductor component in power management and signal conditioning circuits. The industry-standard 1N4739 designation ensures broad compatibility with existing circuit designs and replacement strategies.

Replacement Considerations

Direct substitutes include the 1N4739A series from various manufacturers such as onsemi or Microchip (e.g., 1N4739AG). Ensure any replacement maintains the 9.1 V nominal voltage, 5% tolerance, and compatible package footprint for mechanical interchangeability.