MAX6346UR45

Overview

The MAX6346UR45+T is a single-channel voltage supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It operates within a supply voltage range of up to 5.5V and features a fixed threshold voltage of 4.5V with an accuracy of 1.5%. The device provides an active-low, push-pull reset output with a typical reset delay time of 185ms. It consumes only 500nA of operating supply current and functions reliably across a temperature range of -40°C to +85°C. Packaged in a compact SOT-23-3 surface-mount format, it lacks manual reset, watchdog timer, or battery backup switching capabilities.

Feature Summary

• Ultra-low power consumption with 500nA supply current
• High precision voltage monitoring with 1.5% accuracy
• Active-low push-pull reset output for direct logic interfacing
• Compact SOT-23-3 package suitable for space-constrained designs

Applications

• Portable electronic devices requiring extended battery life
• Microprocessor system power supervision
• Battery-operated equipment voltage monitoring
• Consumer electronics power management circuits

Procurement Notes

Verify the complete part number including suffixes such as +T for tape-and-reel packaging when ordering. Confirm RoHS compliance status through official manufacturer documentation. Ensure the specific threshold voltage variant matches the design requirements, as the MAX6346 series offers multiple fixed voltage options. Check availability status directly with authorized distributors as supply levels may vary.

Selection Notes

Select this component when low quiescent current is critical for battery-operated applications. The push-pull output eliminates the need for external pull-up resistors compared to open-drain alternatives. Verify that the 4.5V threshold aligns with the monitored rail's minimum operating voltage. Consider the 185ms reset timeout duration to ensure compatibility with the target microcontroller's startup sequence requirements.

Part Context

The MAX6346 belongs to Maxim's ultra-low-power supervisor family designed for portable applications. It complements similar parts like the MAX6348 which offers an open-drain output option. The series provides various threshold voltages to accommodate different system rails while maintaining consistent low-power performance characteristics across the product line.

Replacement Considerations

MAX6346UR46+T offers a higher 4.63V threshold with identical electrical characteristics and packaging. MAX6348UR45+T provides the same 4.5V threshold but utilizes an open-drain output configuration instead of push-pull.