MAX6333UR18D3+T

Overview

The MAX6333UR18D3+T is a single-input voltage supervisory circuit manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates within a supply voltage range of 2.5 V to 5.5 V and features a fixed reset threshold voltage of 1.8 V. The device provides an active-low, push-pull RESET output with a standard reset delay time of 40 ms. It consumes a typical operating supply current of 3.3 µA. The component is housed in a compact SOT-23-3 surface-mount package and is rated for operation across an extended temperature range from -40°C to +125°C.

Feature Summary

• Provides reliable system reset assertion when the monitored supply voltage drops below the preset threshold
• Features a push-pull output stage capable of driving loads directly without external pull-up resistors
• Designed for ultra-low power consumption suitable for battery-operated applications

Applications

• Microprocessor (µP) and digital system power supply monitoring
• Battery-powered portable electronic devices requiring low quiescent current
• Embedded systems needing automatic reset upon power failure or brown-out conditions

Procurement Notes

Verify the specific suffix D3 against official documentation to confirm the exact threshold voltage configuration, as suffixes often denote specific voltage options within the series. Confirm RoHS compliance status and lead times through authorized distributors, noting that availability may vary due to lifecycle status. Ensure the SOT-23-3 package footprint matches your PCB design constraints before finalizing procurement.

Selection Notes

Select this component when a fixed 1.8 V threshold is required for monitoring lower-voltage logic rails. The push-pull output distinguishes it from open-drain variants like the MAX6334, offering stronger drive capability. Consider the 40 ms timeout period to ensure compatibility with the target microprocessor's startup requirements. Evaluate the 3.3 µA supply current against strict battery life specifications.

Part Context

This part belongs to the MAX6333 family of 3-pin, ultra-low-voltage, low-power µP reset circuits. These devices are designed to increase circuit reliability by eliminating external components and adjustments typically required for power supervision. The family includes variants with different output types and thresholds to suit various system architectures.

Replacement Considerations

Direct functional substitutes include other MAX6333 variants with identical packages but different thresholds, such as MAX6333UR24D3+T. For open-drain outputs, consider the MAX6334 series. Verify pinout compatibility and electrical parameters before substitution.