1N4745UR-1/TR

Overview

The Microchip Technology 1N4745UR-1/TR is a surface mount glass Zener diode with a nominal voltage of 16 V and a power dissipation rating of 1.0 W at 25 °C. It utilizes the DO-213AB MELF package and offers a standard voltage tolerance of ±5%. The device operates within a temperature range of -65 °C to +175 °C, featuring a maximum reverse current of 57 µA at 12.2 V and a dynamic impedance of 16 Ω at a test current of 15.5 mA.

Feature Summary

• Hermetically sealed glass MELF package for high reliability
• Surface mount design suitable for high density mounting
• Inherently radiation hard per MicroNote 050
• ESD nonsensitive construction

Applications

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

Procurement Notes

Verify that the part number includes the TR suffix to confirm tape and reel packaging. Confirm RoHS compliance status by checking for the e3 suffix if required. Ensure the specific voltage tolerance matches the A suffix designation. Cross-reference the manufacturer's latest datasheet for any updates on screening options or environmental declarations before finalizing procurement.

Selection Notes

Select this component when a surface mount equivalent to the axial 1N4745A is needed. The DO-213AB package provides a leadless form factor ideal for space-constrained designs. Consider the hermetic seal for environments where moisture resistance is critical. Verify thermal derating requirements against the intended operating ambient temperature.

Part Context

This device belongs to the 1N4728UR thru 1N4764AUR series of surface mountable 1 watt Zener diodes. It is electrically equivalent to the JEDEC registered 1N4728A thru 1N4764A series but conforms to the DO-213AB outline. The series covers Zener voltages from 3.3 V to 100 V with various tolerance options available via suffix codes.

Replacement Considerations

The 1N4745A is the direct axial-leaded equivalent. For surface mount replacements, verify compatibility with the DO-213AB footprint. Other series members like 1N4744AUR or 1N4746AUR may be used if voltage levels differ.