1N4681UR-1/TR

Overview

The Microchip Technology 1N4681UR-1/TR is a 0.5 W glass surface mount Zener voltage regulator in the DO-213AA package. It provides a nominal Zener voltage of 2.4 V with a standard tolerance of ±5%. The device operates with a test current of 50 µA and features an internal metallurgical bond for high reliability. Electrical characteristics include a maximum reverse leakage current of 2.0 µA at 1.0 V and a maximum DC Zener current of 190 mA. The component supports a junction temperature range from -65 °C to +175 °C.

Feature Summary

• Hermetically sealed glass DO-213AA MELF style surface mount package
• Internal metallurgical bond between metal slugs and silicon die
• Voltage regulation across a broad operating current and temperature range
• Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020

Applications

• Voltage regulation over broad operating current and temperature ranges
• High-reliability applications requiring radiation hardness
• Surface mount equivalents for JEDEC registered axial-leaded series

Procurement Notes

Verify the specific suffix configuration against official datasheets, as ordering suffixes determine tolerance levels, RoHS compliance status, and screening options. Confirm that the TR suffix corresponds to tape and reel packaging requirements. Ensure compatibility with MIL-PRF-19500 up-screening if required for the intended application environment.

Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for high-reliability designs. The internal metallurgical bond offers superior performance compared to standard commercial packages. Consider the 2.4 V nominal voltage and 50 µA test current for low-power regulation circuits. Verify thermal resistance values relative to the FR4 PCB footprint used in the design.

Part Context

This part belongs to the 1N4678UR-1 through 1N4717UR-1 series of 0.5 W Zener voltage regulators. The series provides a selection of voltages from 1.8 V to 43 V in the DO-213AA surface mount package. These devices serve as surface mount equivalents to the JEDEC registered 1N4678 through 1N4717 axial-leaded series.

Replacement Considerations

Equivalent axial-leaded versions are available within the same series by removing the UR suffix (e.g., 1N4681-1). Surface mount variants without the metallurgical bond (-1) or tighter tolerances may be considered if specifications allow.