1N4739UR

Overview

The Microchip Technology 1N4739UR 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 DO-41 axial leaded package and dissipates up to 1 W of power. Key electrical parameters include a maximum reverse leakage current of 10 uA, a Zener impedance of 5 Ohms, and a test current of 28 mA. It supports an operating temperature range from -65 C to +175 C.

Feature Summary

• Provides stable voltage regulation at a nominal 9.1 V level
• Constructed with glass encapsulation for environmental protection
• Capable of handling high thermal loads up to 175 C

Applications

• Voltage reference circuits
• Overvoltage protection stages
• Power supply regulation modules

Procurement Notes

Verify the specific suffix UR against official Microchip documentation to confirm tape-and-reel packaging and RoHS compliance status. Ensure the ordering part number matches the exact manufacturer specifications before procurement to avoid discrepancies in package type or regulatory certification.

Selection Notes

Select this component when a standard 9.1 V regulation point is required within a through-hole design. Consider the 1 W power dissipation limit and the 5 Ohm dynamic impedance for circuit stability. Verify that the DO-41 package dimensions fit the target PCB layout constraints.

Part Context

This component belongs to the JEDEC-standardized 1N47 series of Zener diodes manufactured by Microchip Technology. The series offers various voltage options within the same physical footprint, allowing for consistent mechanical design across different voltage regulation requirements in electronic assemblies.

Replacement Considerations

Cross-reference with other manufacturers' 1N4739 equivalents such as Vishay or Nexperia variants. Confirm that substitute parts meet the identical 9.1 V nominal voltage, 1 W power rating, and DO-41 package specifications.