1N4757UR-1

Overview

The JANTXV1N4757UR-1 is a high-reliability silicon Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 51 V with a tolerance of 10% and a power dissipation rating of 1 W. The component utilizes a DO-213AB (MELF-2) glass package and is hermetically sealed for robust performance in demanding environments. Designed as a unidirectional single-element device, it operates within a junction temperature range of -55°C to +200°C. The unit contains two terminals and is classified under ECCN code EAR99.

Feature Summary

• Hermetically sealed glass MELF package ensures environmental durability
• High-reliability construction suitable for critical applications
• Silicon planar technology for stable voltage regulation

Applications

• Military aerospace electronic systems
• Spacecraft power regulation circuits
• High-reliability industrial control equipment

Procurement Notes

Verify the specific suffix UR-1 against official Microchip documentation to confirm the exact manufacturing lot and qualification standards. Ensure compatibility with existing hermetic sealing requirements. Confirm that the leaded composition meets project specifications. Validate that the DO-213AB footprint matches the design layout. Check current availability status directly with the manufacturer or authorized distributors.

Selection Notes

Select this component when a 51 V reference is required in a surface-mountable hermetic package. The 1 W power rating supports moderate current loads. The wide operating temperature range accommodates extreme thermal conditions. Compare against standard commercial variants if hermetic sealing is not mandatory. Consider the physical dimensions of the MELF case for board space constraints.

Part Context

This part belongs to the 1N4757 series of Zener diodes produced by Microchip Technology. It shares electrical characteristics with other 51 V devices in the family but differs in packaging and reliability grade. The UR-1 designation indicates a specific hermetic MELF configuration distinct from through-hole or plastic surface-mount alternatives.

Replacement Considerations

Direct substitutes include other hermetically sealed 51 V Zener diodes in the DO-213AB package from qualified manufacturers. Verify pinout compatibility and thermal resistance values before substitution.