MAX6328XR25

Overview

The MAX6328XR25 is a supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated, designed for power supply monitoring in electronic systems. It operates within a voltage range of 1.7V to 5.5V and features a fixed threshold voltage of 2.5V for accurate detection. The device provides an active-low reset output with an open-drain configuration, ensuring compatibility with various logic families. It includes a minimum reset timeout of 140ms to prevent premature system activation during power-up transients. Operating reliably across a temperature range of -40°C to +85°C, it consumes ultra-low quiescent current of 500nA, making it suitable for battery-powered applications. Packaged in a compact SOT-23-3 surface-mount format, it supports simple reset and power-on reset functions without manual reset or watchdog capabilities.

Feature Summary

• Ultra-low power consumption with 500nA quiescent current for extended battery life
• Fixed 2.5V threshold voltage ensures precise power supply monitoring
• Active-low open-drain reset output compatible with standard logic interfaces
• Compact SOT-23-3 surface-mount package for space-constrained designs

Applications

• Portable consumer electronics requiring low standby current
• Battery-operated devices needing reliable power-fail detection
• Embedded systems with strict power-supply monitoring requirements
• Industrial control units operating in wide temperature ranges

Procurement Notes

Verify the exact suffix 'R25' corresponds to the 2.5V threshold variant when sourcing. Confirm RoHS compliance status as per manufacturer documentation. Check for lead-free packaging specifications if required by assembly processes. Ensure ESD handling procedures are followed due to sensitive CMOS input structure. Validate supplier authenticity through authorized distribution channels to avoid counterfeit components.

Selection Notes

Select this component when a fixed 2.5V supervision threshold is required alongside minimal power draw. Consider the open-drain output type for level-shifting flexibility in mixed-voltage systems. Evaluate the 140ms minimum timeout against system startup timing constraints. Compare package size benefits against alternative supervisors with similar electrical characteristics but different form factors.

Part Context

Part of the MAX6328 series of ultra-low-power reset circuits from Maxim Integrated, now part of Analog Devices. This family offers various threshold voltages and timeout options in small packages. The MAX6328XR25 specifically targets applications needing precise 2.5V monitoring with low static current. It complements other PMIC solutions by providing dedicated voltage supervision without complex configuration needs.

Replacement Considerations

MAX6328UR25+T: Direct pin-compatible replacement with identical 2.5V threshold and electrical specifications. MAX6328XR25+T: Alternative tape-and-reel packaging option for automated assembly. Verify thermal performance and package dimensions match existing PCB layout before substitution.