1N4687UR-1/TR

Overview

The Microchip Technology 1N4687UR-1/TR is a 0.5 W surface mount Zener voltage regulator housed in a hermetically sealed DO-213AA (MELF) package. It provides a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%. The device operates at a test current of 50 µA and features an internal metallurgical bond for high reliability. Electrical characteristics include a maximum reverse leakage current of 4.0 µA and a maximum DC Zener current of 130 mA.

Feature Summary

• Hermetically sealed glass MELF package with internal metallurgical bonding
• Surface mount equivalent to JEDEC registered 1N4678 through 1N4717 series
• Non-sensitive to electrostatic discharge per MIL-STD-750 method 1020
• Inherently radiation hard design

Applications

• Voltage regulation over broad operating current and temperature ranges
• High-reliability electronic circuits requiring radiation hardness
• Applications necessitating minimal capacitance and low leakage current

Procurement Notes

Verify the specific suffix configuration against official documentation, as ordering codes determine tolerance levels and RoHS compliance status. Confirm that the TR suffix indicates tape and reel packaging per EIA-481-1-B standards. Ensure compatibility with MIL-PRF-19500 screening requirements if higher reliability grades are specified in the procurement order.

Selection Notes

Select this component when a 4.3 V reference is required in a compact surface mount form factor. The DO-213AA package offers a direct footprint replacement for through-hole equivalents while maintaining hermetic sealing. Consider the 50 µA test current for low-power biasing applications and verify thermal derating curves for operation above 50°C ambient temperature on FR4 substrates.

Part Context

This part belongs to the 1N4678UR-1 through 1N4717UR-1 series of 500 mW Zener diodes manufactured by Microchip Technology. The series covers a voltage range from 1.8 V to 43 V. The UR-1 designation identifies the metallurgically bonded surface mount construction, while the TR suffix specifies tape and reel packaging availability.

Replacement Considerations

Direct replacements include other manufacturers' DO-213AA Zener diodes rated at 4.3 V with similar power dissipation. Verify pinout polarity, as the cathode is indicated by the band on the banded end. Ensure the substitute component meets the same hermetic sealing and radiation hardness requirements if applicable.