1N4728AUR/TR

Overview

The Microchip Technology 1N4728AUR/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB package. It provides a nominal Zener voltage of 3.3 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 10 Ohms at a test current of 76 mA. It includes a maximum reverse current of 100 µA and supports steady-state power dissipation up to 1.00 watts.

Feature Summary

• Hermetically sealed glass MELF package for high reliability
• Surface mount design suitable for high density mounting
• Inherently radiation hard per MicroNote 050
• Non-sensitive to electrostatic discharge (ESD)

Applications

• Voltage regulation in high density circuits
• Applications requiring low parasitic characteristics
• High reliability applications specified by source control drawings

Procurement Notes

Verify that the part number suffix 'TR' corresponds to tape and reel packaging as defined in the datasheet. Confirm the specific manufacturer origin, as this series is produced under the Microsemi Scottsdale Division which may be associated with Microchip Technology. Ensure the required voltage tolerance matches the 'A' suffix designation.

Selection Notes

Select this component when a surface mount equivalent to the axial 1N4728A is required. The DO-213AB package offers a leadless form factor ideal for space-constrained designs. Consider the hermetic glass construction if environmental sealing or radiation hardness is necessary for the target application environment.

Part Context

This device belongs to the 1N4728AUR through 1N4764AUR series of surface mount Zener diodes. It is electrically equivalent to the JEDEC registered 1N4728A through 1N4764A series but utilizes the DO-213AB outline instead of the DO-41 package. The series covers Zener voltages from 3.3V to 100V.

Replacement Considerations

The axial leaded 1N4728A is the electrical equivalent. Surface mount equivalents include the SMAJ4728A series.