MAX6346UR44+T

Overview

The MAX6346UR44+T is a single-channel voltage supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 2.7 V to 5.5 V and features a fixed threshold voltage of 4.38 V with an accuracy of 1.5%. The device provides an active-low, push-pull output and includes a reset timeout of 100 ms minimum. It consumes 500 nA of operating current and functions across temperatures from -40°C to +85°C in a SOT-23-3 package.

Feature Summary

• Ultra-low power consumption with 500 nA operating current
• Fixed 4.38 V threshold voltage with 1.5% accuracy
• Active-low push-pull output configuration
• Compact SOT-23-3 surface-mount packaging

Applications

• Portable battery-powered equipment
• Microprocessor system supervision
• Automatic shutdown circuits
• Low-battery lockout applications

Procurement Notes

Verify the specific suffix UR44 indicates the 4.38 V threshold variant. Confirm RoHS compliance status through official documentation. Check for obsolescence notices as some Maxim products face limited availability. Ensure the SOT-23-3 footprint matches your PCB design requirements before finalizing procurement.

Selection Notes

Select this component when a fixed 4.38 V monitoring point is required. The low quiescent current makes it suitable for battery-operated devices. The push-pull output allows direct interfacing with digital logic without external pull-ups. Verify that the 100 ms reset delay meets your system startup timing constraints.

Part Context

This part belongs to the MAX6346 series of micropower reset circuits. It is designed for applications requiring reliable voltage monitoring with minimal power impact. The series offers various threshold options, with the UR44 suffix specifying the 4.38 V version. It replaces older discrete supervisor solutions in compact designs.

Replacement Considerations

Check for MAX6346 variants with different threshold voltages if 4.38 V is not suitable. Consider the MAX6348 or MAX6378 series for similar functionality with potentially different output types or thresholds. Verify pin compatibility when substituting with other SOT-23-3 supervisors.