MAX6346XR37-T

Overview

The MAX6346XR37-T is a single-channel microprocessor supervisory circuit manufactured by Maxim Integrated, now part of Analog Devices Inc. It monitors power-supply voltages within the +1.8V to +5.0V range while consuming only 3µA of supply current at +1.8V. The device features a factory-set reset threshold voltage of 3.7V with ±2.5% accuracy over temperature. It provides an active-low push-pull reset output that asserts when VCC falls below the threshold and remains asserted for a minimum timeout period after VCC rises above it. The component operates in temperatures from -40°C to +125°C and is housed in a lead-free SC-70 (SOT-323) package.

Feature Summary

• Ultra-low power consumption of 3µA at 1.8V
• Factory-set 3.7V reset threshold with high accuracy
• Active-low push-pull reset output valid down to 1V
• Compact lead-free SC-70 surface-mount packaging

Applications

• Portable battery-powered equipment
• Wireless communication devices
• Handheld instruments
• Laptop and notebook computers

Procurement Notes

Verify the manufacturer designation as Maxim Integrated or Analog Devices Inc., noting the corporate acquisition history. Confirm the specific suffix 'T' indicates tape-and-reel packaging if required by assembly processes. Ensure the device meets RoHS compliance standards for lead-free construction. Cross-reference the exact reset threshold voltage of 3.7V against system requirements to guarantee proper supervision timing.

Selection Notes

Select this component when a fixed 3.7V threshold is appropriate for the target power rail. The SC-70 package suits space-constrained designs requiring minimal footprint. Consider the active-low push-pull output capability for direct interfacing with logic inputs. Evaluate the low quiescent current benefit for extending battery life in portable applications compared to higher-power alternatives.

Part Context

This part belongs to the MAX6381–MAX6390 family of low-voltage, low-power microprocessor reset circuits. The family offers various threshold voltages, timeout periods, and output configurations. The MAX6346 specifically denotes a single-channel device with a fixed 3.7V threshold and active-low push-pull output, distinguishing it from adjustable or open-drain variants within the same series.

Replacement Considerations

Check for MAX6346XR37 without the 'T' suffix for loose-tape availability. Verify compatibility with MAX6346XR37D7+ for lead-free specifications. Ensure substitute parts maintain the 3.7V threshold and SC-70 package dimensions for pin-to-pin replacement.