1N5278BUR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N5278BUR-1/TR is a surface mount Zener diode in the 1N5221BUR-1 through 1N5281BUR-1 series. It provides a 0.5 W power dissipation rating with a nominal Zener voltage of 170 V at a test current of 0.74 mA. The device features a 5% voltage tolerance and operates within a junction temperature range of -65°C to +175°C. Packaged in a hermetically sealed DO-213AA (MELF) glass case, it includes an internal metallurgical bond. The TR suffix indicates tape and reel packaging.

Single Zener Diodes Feature Summary

• Hermetically sealed surface mount package with internal metallurgical bond
• Surface mount equivalent of JEDEC registered axial-leaded series
• Inherently radiation hard per Microsemi documentation
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

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

Single Zener Diodes Procurement Notes

Verify that the specific order matches the required tolerance level, as the 'B' suffix denotes a standard 5% tolerance. Confirm the presence of the 'TR' suffix for tape and reel packaging if automated assembly is intended. Ensure compliance requirements are met, noting that RoHS compliant versions are available only on commercial grade parts without military screening prefixes.

Single Zener Diodes Selection Notes

Select this component when a surface mount solution is required for high-voltage regulation applications up to 200 V. The DO-213AA package offers a compact footprint suitable for space-constrained designs. Consider the maximum reverse leakage current and dynamic impedance specifications for precision circuit requirements. Verify thermal derating curves against expected ambient temperatures to ensure safe operation within the 0.5 W limit.

Single Zener Diodes Part Context

This part belongs to the 1N5221BUR-1 through 1N5281BUR-1 series of 0.5 watt Zener voltage regulators. The series covers a voltage range from 2.4 to 200 volts. These devices serve as surface mount equivalents to the popular JEDEC registered 1N5221 to 1N5281 axial-leaded series. They are manufactured using a metallurgically bonded configuration for enhanced reliability.

Single Zener Diodes Replacement Considerations

Direct replacements include other manufacturers' MELF-style Zener diodes rated for 170 V and 0.5 W. Verify pinout compatibility and physical dimensions of the DO-213AA package. For military-grade requirements, check availability of screened variants such as those prefixed with MQ, MX, or MV.