1N5255BUR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N5255BUR-1/TR is a surface mount Zener voltage regulator featuring a metallurgically bonded glass DO-213AA (SOD80/MLL34) MELF package. It provides a nominal Zener voltage of 28 V with a 5% tolerance at a test current of 4.5 mA. The device dissipates up to 0.5 W and operates within a junction temperature range of -65°C to +175°C. Electrical characteristics include a maximum dynamic impedance of 44 Ohms, a reverse leakage current of 100 nA, and a positive temperature coefficient of 0.091%/°C.

Single Zener Diodes Feature Summary

• Hermetically sealed metallurgically bonded glass construction for reliability
• Surface mount equivalent to the JEDEC registered 1N5221 through 1N5281 series
• Inherently radiation hard design suitable for harsh environments
• Non-sensitive to electrostatic discharge events

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage generation in precision circuits
• Protection against voltage transients in sensitive electronics

Single Zener Diodes Procurement Notes

Verify that the specific part number includes the TR suffix to confirm tape and reel packaging compliance with EIA-481-B standards. Ensure the ordering code matches the required voltage tolerance level, as suffixes define specific manufacturing grades. Confirm RoHS compliance status if restricted materials are prohibited in the assembly process.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount solution is required for high-reliability applications. The DO-213AA package offers a direct footprint replacement for axial leads while maintaining ruggedness. Consider the thermal resistance values and derating curves to ensure adequate heat dissipation under steady-state power conditions.

Single Zener Diodes Part Context

This device belongs to the 1N5221BUR-1 through 1N5281BUR-1 series of 0.5-watt Zener regulators. These parts serve as surface mount equivalents to the widely used axial-leaded JEDEC registered series. The series covers a voltage range from 2.4 to 200 volts, providing options for various standard and tighter voltage tolerances.

Single Zener Diodes Replacement Considerations

Direct surface mount replacements include other devices within the 1N5221BUR-1 to 1N5281BUR-1 series. For axial leaded equivalents, consult the 1N5221B-1 through 1N5281B-1 listings. Verify pinout compatibility and thermal performance before substituting with non-Microsemi components.