MAX6339BUT

Overview

The MAX6339BUT is a quad voltage microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors four independent power supply rails simultaneously within a compact SOT-23-6 surface-mount package. The device features an active-low, open-drain reset output that asserts when any monitored voltage falls below its respective threshold. Key electrical parameters include a maximum supply voltage of 5.5 V, a reset delay time of 140 ms, and a typical operating supply current of 55 µA. The reset thresholds are factory-set to 1.58 V, 2.78 V, 4.63 V, and an adjustable level. The circuit operates reliably across an extended temperature range from -40°C to +85°C with a threshold accuracy of 5%.

Feature Summary

• Simultaneous monitoring of four distinct power supply voltages
• Active-low open-drain reset output for system control
• Ultra-low power consumption suitable for battery-operated devices
• Compact six-pin SOT-23 surface-mount packaging

Applications

• Portable electronic equipment requiring multi-rail power supervision
• Battery-powered consumer electronics systems
• Embedded microprocessor reset circuits
• Industrial control units with multiple voltage domains

Procurement Notes

Verify the specific suffix designation (e.g., +T) against the manufacturer's official documentation to confirm pinout compatibility and lead-free status. Ensure the selected variant matches the required threshold configuration and packaging type. Cross-reference the component marking code with the datasheet to authenticate the source and prevent counterfeit substitution during acquisition.

Selection Notes

Select this component when simultaneous supervision of four voltage rails is required in a minimal footprint. The fixed thresholds of 1.58 V, 2.78 V, and 4.63 V cover common logic levels, while the adjustable channel offers flexibility for non-standard rails. Consider the 140 ms timeout duration to ensure stable system initialization before releasing the reset signal.

Part Context

This part belongs to the MAX6339P series of quad voltage supervisors designed for low-power applications. It integrates four independent window comparators into a single chip, eliminating the need for discrete components typically used for power monitoring. The series is engineered to enhance system reliability by detecting brown-out conditions and ensuring proper reset sequencing in complex digital environments.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific component configuration are not available in the provided reference data.