1N4745AUR/TR

Overview

The Microchip Technology 1N4745AUR/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB (MELF) package. It provides a nominal Zener voltage of 16 V with a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +175°C and features a maximum dynamic impedance of 16 Ohms at a test current of 15.5 mA. It includes a maximum reverse leakage current of 57 µA at 12.2 V and a forward voltage of 1.2 V at 200 mA.

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
• Electrically equivalent to the JEDEC registered 1N4745A in the DO-41 axial-leaded package

Applications

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

Procurement Notes

Verify that the ordering suffix TR indicates tape and reel packaging, typically 1500 units per 7-inch reel or 5000 units per 13-inch reel as per EIA-481-B standards. Confirm the presence of the A suffix ensures the specified ±5% voltage tolerance. Ensure compatibility with the DO-213AB footprint during procurement planning.

Selection Notes

Select this component when a surface mount solution is required that matches the electrical characteristics of the traditional DO-41 axial Zener series. The hermetic glass construction supports environments demanding high reliability. Verify thermal management needs against the specified junction-to-end cap thermal resistance of 50 °C/W.

Part Context

This part belongs to the 1N4728AUR through 1N4764AUR series of surface mount 1.0 W glass Zener diodes manufactured by Microsemi (now Microchip Technology). These devices are designed as direct surface mount replacements for the corresponding JEDEC registered axial-leaded parts, offering identical electrical performance in a compact leadless package.

Replacement Considerations

Direct surface mount replacement for 1N4745A. Equivalent part numbers include MLL4745A.