1N4746AUR/TR

Overview

The Microchip Technology 1N4746AUR/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB MELF package. It provides an 18 V nominal Zener voltage with a standard ±5% tolerance. Electrical characteristics include a maximum dynamic impedance of 20 Ω at a test current of 14 mA and a maximum reverse leakage current of 50 µA at 13.7 V. The device operates within a temperature range of -65°C to +175°C, features a forward voltage of 1.2 V maximum at 200 mA, and utilizes tape and reel packaging.

Feature Summary

• Hermetically sealed glass construction suitable for high reliability applications
• Surface mount design ideal for high density mounting with low parasitic requirements
• Inherently radiation hard per MicroNote 050
• ESD nonsensitive operation

Applications

• Voltage regulation in high density electronic circuits
• High reliability systems requiring source control drawings
• Applications necessitating radiation hardness

Procurement Notes

Verify that the specific ordering suffix matches the required tolerance and compliance standards. Confirm the presence of the TR suffix indicates tape and reel packaging. Ensure the component meets the necessary environmental specifications for the intended operating temperature range. Cross-reference the manufacturer part number with the official datasheet to validate electrical parameters before procurement.

Selection Notes

Select this component when a 1.0 W power dissipation rating and DO-213AB surface mount footprint are required. The 18 V Zener voltage with ±5% tolerance suits general regulation tasks. Consider the hermetic glass package for environments demanding high reliability or radiation resistance. Verify thermal derating requirements against the application's ambient temperature constraints.

Part Context

This component belongs to the 1N4728AUR through 1N4764AUR series of surface mount glass Zener diodes manufactured by Microsemi (now Microchip Technology). The series offers Zener voltages ranging from 3.3 V to 100 V. These devices serve as surface mount equivalents to the JEDEC registered 1N4728A through 1N4764A axial leaded series, maintaining electrical equivalence while utilizing the DO-213AB outline.

Replacement Considerations

The MLL4746A is a confirmed alternate name for this component series. Surface mount equivalents such as SMAJ4746A are available. Axial leaded equivalents include the 1N4746A.