MAX6337US18D3

Overview

The MAX6337US18D3 is a 4-pin, ultra-low-voltage microprocessor supervisory circuit in an SOT-143 package. It monitors a single input with a fixed threshold voltage of 1.8V and features an active low, open-drain output. The device includes a debounced manual reset input and offers a reset delay time of 150 ms. Operating from a supply voltage up to 5.5V, it draws a typical quiescent current of 3.3 µA. Accuracy is specified at ±1.8% at room temperature, with an overvoltage threshold of 2.34V. It functions within a temperature range of -40°C to +125°C.

Feature Summary

• Provides reliable system reset by monitoring power supply voltage against a preset threshold
• Features a debounced manual-reset input for user-initiated system control
• Delivers an active low, open-drain reset signal to interface with digital logic
• Designed for ultra-low-power operation suitable for battery-supplied systems

Applications

• Microprocessor (µP) power supply supervision
• Digital system voltage monitoring
• Battery-operated electronic devices
• Portable consumer electronics requiring low standby current

Procurement Notes

Verify the specific suffix D3 indicates tape and reel packaging when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the operating environment remains within the specified -40°C to +125°C range. Check for pinout compatibility if replacing existing components on a PCB layout.

Selection Notes

Select this component when a fixed 1.8V threshold is required for system supervision. Consider the open-drain output configuration for level shifting needs. Evaluate the 3.3 µA quiescent current against total system power budgets. Verify that the 150 ms reset delay aligns with the target microprocessor startup requirements.

Part Context

This part belongs to the MAX6337 series of ultra-low-voltage supervisory circuits manufactured by Analog Devices Inc./Maxim Integrated. The series provides cost-effective solutions for eliminating external components in microprocessor systems. The US18 variant specifically targets applications requiring a precise 1.8V monitoring threshold with minimal power consumption.

Replacement Considerations

Cross-reference with MAX6337US18D3+T for identical electrical specifications and packaging. Verify pinout compatibility before substitution. Ensure thermal performance meets requirements under maximum load conditions.