1N5257BUR-1

Single Zener Diodes Overview

The Microchip Technology 1N5257BUR-1 is a surface mount Zener voltage regulator with a nominal breakdown voltage of 33 V. It operates within a test current range of 3.8 mA and maintains a maximum dynamic impedance of 58 Ohms at the specified test point. The device dissipates up to 0.5 W of power and features a temperature coefficient of +0.092 %/°C. Electrical characteristics are guaranteed within a junction temperature range of -65 °C to +175 °C, with a maximum reverse leakage current of 0.1 µA.

Single Zener Diodes Feature Summary

• Hermetically sealed glass DO-213AA (MELF style) package with internal metallurgical bond
• Surface mount equivalent of JEDEC registered 1N5221 thru 1N5281 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
• Reference voltage generation in electronic circuits
• Protection against voltage transients

Single Zener Diodes Procurement Notes

Verify that the ordering suffix 'B' confirms the required 5% voltage tolerance for your specific design requirements. Confirm whether RoHS compliance is necessary, as commercial grade versions offer compliant plating options while others may use tin-lead terminals. Ensure the selected variant matches the hermetic sealing specifications required for your environmental conditions.

Single Zener Diodes Selection Notes

Select this component when a surface mount solution is needed to replace traditional axial-leaded Zener diodes without altering board layout significantly. Consider the positive temperature coefficient for applications where voltage increases with heat. Evaluate the low capacitance characteristics if high-speed switching or signal integrity is critical in the circuit design.

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. The series offers various tolerance levels identified by suffix letters, allowing designers to choose precision levels ranging from 10% down to 1%. These devices serve as direct surface mount replacements for popular industry-standard axial components.

Single Zener Diodes Replacement Considerations

Direct surface mount equivalents exist for the 1N5257B axial-leaded version. Verify pinout compatibility and thermal dissipation capabilities on the target PCB footprint when transitioning from through-hole designs.