MAX6333UR20D3+T

Supervisors Overview

The MAX6333UR20D3+T is a 3-pin, ultra-low-voltage microprocessor supervisory circuit from the MAX6333 series. It monitors a single power supply input with a fixed reset threshold voltage of 2.0 V. The device features an active-low, push-pull RESET output and provides a reset delay time of 40 ms after the supply voltage rises above the threshold. It operates within a supply voltage range up to 5.5 V and consumes only 3.3 µA of quiescent current. The component is housed in a compact SOT-23-3 surface-mount package and supports operation across an extended industrial temperature range from -40°C to +125°C.

Supervisors Feature Summary

• Provides reliable system reset by asserting an active-low signal when the monitored supply voltage drops below the preset threshold.
• Features a push-pull output stage capable of driving loads directly without requiring external pull-up resistors.
• Ensures stable power-up sequencing through a fixed timeout period that maintains the reset assertion until the supply voltage stabilizes.

Supervisors Applications

• Monitoring power rails in 1.8V to 3.3V microprocessor systems
• Digital logic circuits requiring supervised power-on reset
• Battery-powered devices needing low-quiescent-current supervision

Supervisors Procurement Notes

Verify the specific suffix D3 indicates the 2.0V threshold variant against the official datasheet. Confirm RoHS compliance status for the specific manufacturing lot. Check availability as this part may be subject to limited supply or end-of-life restrictions. Ensure the SOT-23-3 package matches your PCB footprint requirements before procurement.

Supervisors Selection Notes

Select this component when a fixed 2.0V threshold is required for the monitored rail. Choose the push-pull output configuration if direct drive capability is needed without external components. Consider the 40ms delay for applications tolerant of longer power-up times. Verify that the 3.3µA current consumption meets the system's power budget constraints.

Supervisors Part Context

This part belongs to the MAX6333 family of 3-pin uPower reset circuits designed for low-voltage digital systems. Unlike the MAX6332 (active-high) or MAX6334 (open-drain), the MAX6333 specifically offers an active-low push-pull output. The UR20 designation specifies the internal reference voltage setting for the supervisory function.

Supervisors Replacement Considerations

Direct substitutes include other MAX6333 variants with different threshold voltages, such as MAX6333UR18D3+T (1.8V) or MAX6333UR24D3+T (2.4V), provided the threshold adjustment is acceptable. Cross-family replacements like the MAX6332 or MAX6334 require attention to output polarity and driver type differences.