1N4739UR/TR

Overview

The Microchip Technology 1N4739UR/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB MELF package. It provides a nominal Zener voltage of 9.1 V with a standard tolerance of ±5%. Electrical characteristics include a test current of 28 mA, maximum dynamic impedance of 5.0 Ohms at IZT, and a maximum reverse current of 10 µA at VR = 7 V. The device supports a maximum regulator current of 0.5 A and operates within a temperature range of -65°C to +175°C.

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

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm compliance details such as RoHS status or screening options. Confirm that the TR suffix indicates tape and reel packaging. Ensure the component meets the required MIL-PRF-19500 screening levels if applicable to the application. Cross-reference the part number with the equivalent MLL4728A series nomenclature.

Selection Notes

Select this component when a 1.0 W surface mount Zener diode with a 9.1 V breakdown voltage is required. The DO-213AB package offers a leadless form factor beneficial for space-constrained layouts. Consider the ±5% voltage tolerance and the specified thermal resistance values for FR4 PCB mounting when designing the thermal management strategy.

Part Context

This device belongs to the 1N4728AUR through 1N4764AUR series of surface mount glass Zener diodes manufactured by Microsemi (now Microchip Technology). The series is electrically equivalent to the JEDEC registered 1N4728A through 1N4764A axial-leaded series but utilizes the DO-213AB outline. It serves as a surface mount alternative to plastic body axial-leaded equivalents.

Replacement Considerations

Equivalent parts include the MLL4739A series. Surface mount equivalents are available in SMAJ packages.