1N5256BUR-1/TR

Single Zener Diodes Overview

The Microchip Technology 1N5256BUR-1/TR is a surface mount Zener voltage regulator with a nominal breakdown voltage of 30 V and a maximum power dissipation of 0.5 W. It features a metallurgically bonded glass DO-213AA package, offering hermetic sealing for reliability. The device provides a 5% voltage tolerance and operates within a junction temperature range of -65°C to +175°C. Electrical characteristics include a test current of 4.2 mA, a maximum reverse leakage current of 0.1 µA, and a dynamic impedance of 49 Ohms at the test point.

Single Zener Diodes Feature Summary

• Hermetically sealed metallurgically bonded glass surface mount package
• Surface mount equivalent to JEDEC registered 1N5221 series
• Inherently radiation hard design
• Non-sensitive to electrostatic discharge

Single Zener Diodes Applications

• Voltage regulation over broad operating current and temperature ranges
• Reference voltage sources in harsh environments
• Protection circuits requiring ESD robustness

Single Zener Diodes Procurement Notes

Verify that the specific ordering suffix matches the required RoHS compliance status and tape-and-reel packaging configuration. Confirm that the manufacturer designation aligns with current corporate ownership structures following industry acquisitions. Ensure the component lot meets any necessary screening requirements relative to MIL-PRF-19500 if specified for the application.

Single Zener Diodes Selection Notes

Select this component when a hermetically sealed surface mount Zener diode is required for high-reliability applications. The DO-213AA package serves as a direct footprint-compatible alternative to axial-leaded equivalents. Consider the positive temperature coefficient at 30 V for thermal stability in precision reference designs compared to lower voltage alternatives.

Single Zener Diodes Part Context

This part belongs to the 1N5221BUR-1 through 1N5281BUR-1 series, which provides a comprehensive range of Zener voltages from 2.4 V to 200 V in a standardized surface mount form factor. The series maintains electrical and mechanical compatibility with legacy through-hole JEDEC types while enabling automated assembly processes.

Single Zener Diodes Replacement Considerations

Direct parameter-equivalent replacements within the same series include 1N5255BUR-1/TR (28 V) or 1N5257BUR-1/TR (33 V) if voltage adjustment is permissible. Verify package dimensions and terminal plating specifications against existing board layouts before substitution.

Single Zener Diodes FAQ

What is the polarity indication on the DO-213AA package?

The cathode is indicated by a band on the device. For Zener regulation operation, the banded end must be connected positive with respect to the opposite end.

Is the 1N5256BUR-1/TR radiation hard?

Yes, the device is inherently radiation hard per Microsemi MicroNote 050 documentation.