1N4755UR-1/TR

Overview

The Microchip Technology 1N4755UR-1/TR is a surface mountable 1.0-watt glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 43V with a standard tolerance of +/-5%. The device operates within a temperature range of -65°C to +175°C and features a maximum reverse current of 5µA at 22V. Electrical characteristics include a test current of 6.0mA, a dynamic impedance of 70 Ohms at IZT, and a maximum regulator current of 0.25A.

Feature Summary

• Hermetically sealed glass MELF package suitable for high reliability applications
• Surface mount equivalent to JEDEC registered axial-leaded series
• Inherently radiation hard per MicroNote 050
• Leadless design ideal for high density mounting

Applications

• Voltage regulation in high density circuit designs
• Low parasitic requirement applications
• High reliability systems requiring source control drawings

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm RoHS compliance and tape-and-reel packaging specifications. Confirm that the manufacturer designation aligns with current corporate structures following industry acquisitions. Ensure the component meets the required environmental screening standards if intended for aerospace or defense use cases.

Selection Notes

Select this component when a surface mount solution is required for 1-watt Zener regulation. The DO-213AB package offers a direct footprint replacement for axial components while maintaining hermetic sealing. Consider the thermal resistance characteristics and derating curves for proper heat dissipation on FR4 PCBs.

Part Context

This part belongs to the 1N4728UR through 1N4764AUR series of surface mount Zener diodes. Originally manufactured by Microsemi, these devices are now part of the Microchip Technology portfolio. The series covers Zener voltages from 3.3V to 100V, providing options for various voltage regulation needs in compact electronic assemblies.

Replacement Considerations

Direct electrical equivalents include the MLL4755A series. Surface mount alternatives such as SMAJ4755A are available for different form factor requirements. Axial-leaded equivalents like the 1N4755A can be used if board space permits.