1N5277BUR-1

Single Zener Diodes Overview

The Microchip Technology 1N5277BUR-1 is a 0.5 W Zener voltage regulator in a DO-213AA (SOD80/MLL34) MELF surface mount package. It provides a nominal Zener voltage of 170 V with a test current of 0.74 mA and a maximum impedance of 190 Ohms at IZT. The device features a 10% tolerance, a temperature coefficient of +0.110 %/°C, and a maximum reverse leakage current of 1900 µA at 180 V. It operates within a junction temperature range of -65°C to +175°C.

Single Zener Diodes Feature Summary

• Hermetically sealed glass MELF package with internal metallurgical bond for environmental stability.
• Surface mount equivalent to JEDEC registered axial-leaded series for direct footprint compatibility.
• Inherently radiation hard per Microsemi documentation and non-sensitive to ESD.

Single Zener Diodes Applications

• Voltage regulation in harsh environments requiring hermetic sealing.
• Radiation-hardened electronic systems.
• Precision reference circuits where low capacitance is required.

Single Zener Diodes Procurement Notes

Verify the specific suffix letters on the part number to confirm the exact voltage tolerance level (e.g., B for 5%, C for 2%, D for 1%) as indicated in the nomenclature guide. Confirm RoHS compliance status if required, noting that commercial versions may differ from military screening options. Ensure the ordering suffix matches the desired reliability level and plating type.

Single Zener Diodes Selection Notes

Select this component when a ruggedized, surface-mount Zener diode is needed to replace traditional axial leads without changing the PCB layout. Consider the thermal resistance and power derating curves for high-temperature applications. Verify that the operating current stays within the specified limits to maintain accurate voltage regulation and prevent overheating.

Single Zener Diodes Part Context

This part belongs to the 1N5221BUR-1 through 1N5281BUR-1 series, which covers a wide voltage range from 2.4 V to 200 V. These devices are designed as surface-mount alternatives to the popular JEDEC registered 1N5221 to 1N5281 series, offering similar electrical characteristics in a compact, metallurgically bonded glass package suitable for automated assembly.

Single Zener Diodes Replacement Considerations

Direct replacement parts include other 1N5277 variants in different packages or tolerances, such as 1N5277B or 1N5277A, provided the voltage and power ratings match. Cross-reference with other manufacturers' MELF-style Zener diodes only if they meet the same hermetic sealing and radiation hardness requirements.