1N4741UR-1/TR

Overview

The Microchip Technology 1N4741UR-1/TR is a surface mountable 1.0-watt glass Zener diode in the DO-213AB MELF package. It provides an electrical equivalent to the JEDEC registered 1N4741A axial lead series. The nominal Zener voltage is 11V with a standard tolerance of +/-5%. Key electrical parameters include a test current (IZT) of 23mA, maximum dynamic impedance (ZZT) of 8 Ohms at IZT, and a maximum reverse current (IR) of 5µA at VR of 7.6V. The device supports a maximum regulator current (IZM) of 0.25A at TA = 50°C and features a thermal resistance of 50°C/W junction to end cap.

Feature Summary

• Hermetically sealed glass MELF package suitable for high reliability applications
• Surface mount design ideal for high density mounting with low parasitic requirements
• Inherently radiation hard per MicroNote 050
• Wide operating temperature range from -65°C to +175°C

Applications

• Voltage regulation in high density circuit boards
• High reliability electronic systems requiring hermetic sealing
• Radiation-hardened environments

Procurement Notes

Verify that the specific part number includes the TR suffix to confirm tape and reel packaging configuration. Confirm RoHS compliance status by checking for the e3 suffix if required. Ensure the ordering prefix matches the desired voltage tolerance and screening level options provided in the manufacturer documentation.

Selection Notes

Select this component when a 1.0-watt surface mount Zener diode is required as a direct replacement for the DO-41 axial lead 1N4741A. Consider the DO-213AB package dimensions and recommended footprint for PCB layout. Evaluate the thermal derating curves if operation exceeds standard ambient temperature limits or if mounted on FR4 PC boards.

Part Context

This device belongs to the 1N4728UR thru 1N4764AUR series of surface mount 1.0-watt glass Zener diodes. It serves as the surface mount equivalent to the traditional JEDEC registered 1N4728A thru 1N4764A axial lead series. The series offers a broad selection of Zener voltages ranging from 3.3V to 100V.

Replacement Considerations

Direct surface mount equivalents are available within the same series. Axial lead replacements include the 1N4741A. Surface mount plastic body equivalents may be found in the SMAJ4728A to SMAJ4764A series.