MAX6333UR18D3

Overview

The MAX6333UR18D3 is a 3-pin, ultra-low-voltage microprocessor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It monitors a single power supply input with a fixed reset threshold voltage of 1.8V. The device features an active-low, push-pull RESET output and operates within a supply voltage range up to 5.5V. It consumes only 3.3µA of quiescent current and functions reliably across an extended temperature range from -40°C to +125°C. The component is housed in a compact SOT-23-3 surface-mount package.

Feature Summary

• Provides reliable system reset when supply voltage drops below the preset threshold
• Features low-power operation suitable for battery-supplied applications
• Delivers active-low push-pull output for direct interface with digital logic

Applications

• Microprocessor power supply monitoring in embedded systems
• Battery-operated portable electronic devices requiring low standby current
• Digital consumer electronics needing compact voltage supervision

Procurement Notes

Verify the specific suffix D3 against official manufacturer documentation to confirm pinout and electrical characteristics, as suffixes define critical parameters. Confirm RoHS compliance status through the latest datasheet revision. Check availability status directly with authorized distributors, as this part may be subject to limited supply or obsolescence notices.

Selection Notes

Select this component when a fixed 1.8V threshold is required for low-voltage digital systems. The push-pull output eliminates the need for external pull-up resistors compared to open-drain alternatives. Ensure the application environment stays within the specified -40°C to +125°C operating range and that the supply voltage does not exceed the maximum rating of 5.5V.

Part Context

This part belongs to the MAX6332/MAX6333/MAX6334 family of 3-pin, ultra-low-voltage, low-power µP reset circuits. These devices are designed to monitor power supplies in 1.8V to 3.3V microprocessor and digital systems. The MAX6333 variant specifically provides an active-low, push-pull reset output, distinguishing it from the open-drain MAX6334 and active-high MAX6332.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific configuration are not available in the provided source material.