1N4737AUR

Overview

The Microchip Technology 1N4737AUR is a high-reliability Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 7.5 V with a tolerance of 5%. The device is constructed from silicon and housed in a hermetically sealed glass DO-213AB (MELF-2) package, ensuring isolation. It supports a power dissipation of 1 W and operates within a temperature range of -65 °C to +175 °C. The component is unidirectional and utilizes double slug type construction for robust performance in demanding environments.

Feature Summary

• Hermetically sealed glass MELF package for environmental protection
• High reliability construction suitable for critical applications
• Wide operating temperature range extending to +175 °C
• Isolated case connection for thermal management

Applications

• Military aerospace electronic systems
• Spacecraft power regulation circuits
• High-reliability industrial control equipment
• Harsh environment sensor biasing

Procurement Notes

Verify the specific suffix UR indicates the hermetic glass MELF package configuration distinct from plastic or axial variants. Confirm RoHS status as non-compliant due to lead content typical for hermetic seals. Validate that the supplier provides traceability documentation required for high-reliability procurement standards. Ensure the ordering part number matches the exact voltage and package requirements for the target design.

Selection Notes

Select this component when hermetic sealing and wide temperature operation are mandatory. The DO-213AB package requires appropriate surface mount footprints compatible with cylindrical glass components. Consider the 1 W power rating and thermal resistance when designing heat dissipation paths. Verify compatibility with existing circuit layouts against similar axial or plastic SMD Zener alternatives.

Part Context

This device belongs to the standard 1N47xx series of Zener diodes manufactured by Microchip Technology. The 'A' designation typically denotes a tighter voltage tolerance compared to non-suffixed versions. The 'UR' suffix specifically identifies the hermetic glass MELF form factor, distinguishing it from the standard plastic or axial leaded packages found in the broader series.

Replacement Considerations

• MSP1N4737AUR
• 1N4737AUR/TR

FAQ

What is the maximum operating temperature for the 1N4737AUR?

The maximum operating temperature is +175 °C.

Is the case connection isolated?

Yes, the case connection is isolated.