1N4685UR-1

Overview

The Microchip Technology 1N4685UR-1 is a Zener diode voltage regulator designed for surface mount applications. It features a DO-213AA (MELF) glass package and provides a nominal Zener voltage of 3.6 V with a standard tolerance of 5%. The device operates at a test current of 50 µA and supports a maximum power dissipation of 500 mW. It utilizes an internal metallurgical bond between the metal slugs and silicon die to ensure high reliability. The component is rated for operation within a temperature range extending from -65°C to +175°C.

Feature Summary

• Surface mount equivalent to JEDEC registered 1N4678 through 1N4717 series components
• Internal metallurgical bond construction for enhanced structural integrity
• Hermetically sealed glass MELF package design

Applications

• Voltage regulation in surface mount circuits
• Reference voltage generation in electronic systems
• Protection against voltage transients

Procurement Notes

Verify the specific suffix configuration when ordering, as it determines the packaging format and screening level. Confirm that the DO-213AA package matches your PCB footprint requirements. Ensure the manufacturer documentation aligns with your quality standards, particularly regarding the metallurgical bond specifications and hermetic sealing requirements for your intended application environment.

Selection Notes

Select this component when a surface mount solution is required for low-voltage regulation tasks. The 3.6 V rating suits applications needing precise reference levels. Consider the 500 mW power handling capability for thermal management. The wide operating temperature range makes it suitable for demanding industrial or military environments where standard commercial parts may fail.

Part Context

This part belongs to the 1N4678UR-1 through 1N4717UR-1 series of 0.5 W glass surface mount Zener diodes manufactured by Microchip Technology. These devices serve as the surface mount equivalents of the traditional axial leaded 1N4678 through 1N4717 series. The series offers a selection of voltages ranging from 1.8 V to 43 V, providing designers with flexible options for various regulation needs in compact form factors.

Replacement Considerations

Direct replacements include other manufacturers' DO-213AA packaged Zener diodes with identical 3.6 V ratings and 500 mW power dissipation. Verify pinout compatibility and thermal characteristics before substitution. Alternative packages such as SOD-80 may require circuit board redesign.