1N4746UR-1

Overview

The Microchip Technology 1N4746UR-1 is a silicon unidirectional Zener voltage regulator diode designed for robust circuit protection and voltage reference applications. It operates within a wide temperature range, supporting minimum working temperatures of -65°C and maximum working temperatures up to +175°C. The component features a surface-mount DO-213AA-2 package with a power dissipation rating of 1 W. It exhibits a forward voltage of 1.2 V and maintains a voltage tolerance of 10%. The device weighs approximately 40 mg and is constructed for high-reliability environments requiring stable voltage regulation under varying thermal conditions.

Feature Summary

• Hermetically sealed glass MELF construction ensures environmental durability and long-term stability in harsh operating conditions.
• Wide thermal operating range supports reliable performance across extreme low and high temperature environments.
• Surface-mount DO-213AA-2 package facilitates automated assembly and compact PCB layout integration.

Applications

• Voltage regulation in industrial control systems
• Overvoltage protection circuits in aerospace electronics
• Reference voltage sources in high-temperature sensor interfaces

Procurement Notes

Verify the specific suffix UR-1 against official Microchip documentation to confirm the hermetic seal status and exact package variant. Confirm RoHS compliance details as indicated in manufacturer records. Ensure the ordering part number matches the required voltage tolerance and power dissipation specifications for your design. Cross-reference the datasheet revision date to validate current manufacturing parameters before procurement.

Selection Notes

Select this component when a hermetically sealed surface-mount Zener diode is required for high-reliability applications. The 1W power rating and wide temperature range make it suitable for demanding industrial or aerospace environments. Verify that the DO-213AA-2 footprint aligns with your PCB design constraints. Consider the 10% voltage tolerance if tighter regulation is not critical for the specific circuit function.

Part Context

This part belongs to the 1N4746 series of Zener diodes manufactured by Microchip Technology. It shares functional similarities with other variants in the series but differs in packaging and sealing characteristics. The UR-1 designation typically indicates a specific surface-mount configuration distinct from through-hole or standard commercial versions. This series is widely used in applications requiring stable voltage regulation with high reliability standards.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Consult Microchip Technology's official cross-reference guides or contact technical support for verified alternatives. Ensure any replacement matches the hermetic seal requirement, package dimensions, and electrical specifications of the original 1N4746UR-1 component.