1N4735UR-1

Overview

The Microchip Technology 1N4735UR-1 is a silicon Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 6.2 V with a tolerance of 5%. The device is rated for a power dissipation of 1 W and utilizes the DO-213AB (MELF) surface-mount package. Key electrical characteristics include a maximum reverse leakage current of 5 uA, a Zener impedance of 2 Ohms, and a test current of 41 mA. It operates within a temperature range of -65°C to +175°C.

Feature Summary

• Provides stable voltage regulation at a nominal 6.2 V reference point
• Utilizes hermetically sealed glass MELF construction for environmental protection
• Supports high-temperature operation up to 175°C junction temperature

Applications

• High-reliability aerospace electronic circuits
• Military-grade voltage reference stages
• Harsh environment power supply regulation

Procurement Notes

Verify the specific suffix UR-1 against official Microchip documentation to confirm the hermetic sealing status and MIL-spec compliance requirements. Ensure that the DO-213AB footprint matches the design constraints. Confirm RoHS exemption status if applicable for the specific manufacturing lot.

Selection Notes

Select this component when a hermetically sealed surface-mount Zener diode is required for high-reliability environments. The 1W power rating and 6.2V nominal voltage make it suitable for precision regulation where standard plastic packages are insufficient. Consider the MELF form factor for automated assembly in ruggedized designs.

Part Context

This part belongs to the 1N47 series of Zener diodes manufactured by Microchip Technology. While the base 1N4735 designation refers to a through-hole DO-41 variant, the UR-1 suffix indicates a specific surface-mount configuration in the DO-213AB package. This variant is often associated with high-reliability or military specifications compared to commercial equivalents.

Replacement Considerations

Direct substitutes include other hermetically sealed 6.2V Zener diodes in the DO-213AB package from qualified manufacturers. Verify compatibility with space-constrained PCB layouts requiring MELF footprints.