1N4685UR-1/TR

Overview

The Microchip Technology 1N4685UR-1/TR is a 0.5 W surface mount Zener diode in a hermetically sealed DO-213AA package. It features a nominal voltage of 3.6 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65°C to +175°C and includes internal metallurgical bonding for high reliability.

Feature Summary

• Hermetically sealed glass DO-213AA (MELF style) surface mount package
• Internal metallurgical bond between metal slugs and silicon die
• Up-screening available in reference to MIL-PRF-19500
• Non-sensitive to ESD per MIL-STD-750 method 1020

Applications

• Voltage regulation over broad operating current and temperature ranges
• Radiation-hardened applications
• High-reliability electronic circuits requiring minimal capacitance

Procurement Notes

Verify the specific ordering suffix against the manufacturer's nomenclature guide to confirm tolerance, RoHS compliance, and screening level. Ensure the procurement documentation explicitly references the correct part number variant to match the required electrical characteristics and package specifications.

Selection Notes

Select this component when a hermetically sealed surface mount Zener regulator is required. The DO-213AA package serves as the surface mount equivalent of the JEDEC registered 1N4685 series. Consider tighter voltage tolerances or specific up-screening levels if the application demands higher precision or military-grade reliability standards.

Part Context

This device belongs to the 1N4678UR-1 through 1N4717UR-1 series of 0.5 W glass surface mount Zener voltage regulators. The series provides a selection from 1.8 to 43 volts. Standard tolerance is ±5%, with 1% and 2% options available via specific ordering suffixes.

Replacement Considerations

The commercial version is the surface mount equivalent of the JEDEC registered 1N4678 through 1N4717 series. Verify pinout compatibility and thermal resistance values when substituting into existing designs.