1N4739UR-1/TR

Overview

The Microchip Technology 1N4739UR-1/TR is a surface mountable 1.0 W glass Zener diode in the DO-213AB (MLL) 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 operates within a temperature range of -65°C to +175°C and features a hermetically sealed glass MELF case.

Feature Summary

• Hermetically sealed glass MELF package for high reliability applications
• Surface mount design ideal for high density mounting
• Inherently radiation hard per MicroNote 050
• Regulates voltage over a broad operating current and temperature range

Applications

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

Procurement Notes

Verify that the part number includes the 'TR' suffix to confirm tape and reel packaging configuration. Ensure the 'UR' designation aligns with the required surface mount lead finish and JEDEC outline specifications. Confirm RoHS compliance status if applicable by checking for the 'e3' suffix variant. Cross-reference the manufacturer's latest datasheet for any updates to mechanical dimensions or electrical limits.

Selection Notes

Select this component when a 1.0 W power dissipation rating and a 9.1 V Zener voltage are required in a surface mount form factor. The DO-213AB package offers a direct footprint alternative to axial DO-41 packages while maintaining similar electrical performance. Consider the wide operating temperature range and radiation hardness for demanding environments.

Part Context

This device belongs to the 1N4728AUR through 1N4764AUR series of surface mount glass Zener diodes. It is electrically equivalent to the registered 1N4728A through 1N4764A axial series but utilizes the DO-213AB outline. The series covers Zener voltages from 3.3 V to 100 V, providing a standardized solution for various voltage regulation needs in compact layouts.

Replacement Considerations

Direct surface mount equivalents include the MLL4739A series. Axial replacements such as the 1N4739A provide identical electrical characteristics but require through-hole mounting. Verify compatibility with existing PCB footprints when substituting between package types.