1N5279BUR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N5279BUR-1/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 180 V and a maximum power dissipation of 0.5 W. It utilizes a hermetically sealed DO-213AA (MELF) package featuring an internal metallurgical bond. The device operates within a junction temperature range of -65°C to +175°C. Electrical characteristics include a test current of 0.68 mA, a maximum dynamic impedance of 2200 Ohms at the test point, and a maximum reverse leakage current of 6 µA at 130 V. The part exhibits a positive temperature coefficient of +0.110 %/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass MELF package with internal metallurgical bonding for enhanced reliability.
• Surface mount equivalent to the JEDEC registered 1N5221 through 1N5281 series.
• Inherently radiation hard per Microsemi documentation.
• Non-sensitive to electrostatic discharge.

Single Zener Diodes Applications

• Voltage regulation in broad operating current and temperature ranges.
• High-reliability applications requiring up-screening in reference to MIL-PRF-19500.
• Space or aerospace electronics utilizing radiation-hardened components.

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required tolerance level and RoHS compliance status. Confirm whether the 'TR' suffix indicates tape and reel packaging as defined by EIA-481-B standards. Ensure the procurement specification aligns with the manufacturer's nomenclature for the desired reliability level, such as commercial grade versus military screening options.

Single Zener Diodes Selection Notes

Select this component when a ruggedized surface mount solution is required for high-voltage regulation. The DO-213AA package provides a direct footprint alternative to axial-leaded versions while maintaining hermetic sealing. Consider the thermal resistance values and derating curves when designing for ambient temperatures exceeding 50°C on FR4 substrates.

Single Zener Diodes Part Context

This device belongs to the 1N5221BUR-1 through 1N5281BUR-1 series of metallurgically bonded glass surface mount Zeners. The series covers a voltage range from 2.4 V to 200 V. The 1N5279 variant specifically addresses the 180 V segment of this lineup, offering a compact form factor suitable for dense circuit board layouts where traditional axial leads are impractical.

Single Zener Diodes Replacement Considerations

Direct replacements include other manufacturers' 1N5279 variants in DO-213AA packages. Verify pinout polarity and physical dimensions against the DO-213AA datasheet. For higher reliability requirements, confirm if the substitute supports MIL-PRF-19500 screening levels comparable to the original Microchip offering.