MAX9018BEKA+T

Overview

The MAX9018BEKA+T is a dual nanoPower comparator in an 8-pin SOT23 package. It operates on a single supply voltage ranging from 1.8V to 5.5V with a typical supply current of 1.4µA at 5V. The device features Beyond-the-Rails inputs extending 200mV beyond the supply rails and includes an internal 1.24V ±1.75% reference. It utilizes an open-drain output stage suitable for mixed-voltage systems, offering an input offset voltage of 5mV maximum and 4mV internal hysteresis.

Feature Summary

• Features Beyond-the-Rails inputs allowing operation 200mV beyond supply rails
• Includes an integrated 1.24V precision voltage reference
• Open-drain output stage designed for mixed-voltage system compatibility
• Contains internal 4mV hysteresis to ensure clean switching

Applications

• 2-cell battery monitoring and management
• Ultra-low power mobile systems
• Threshold detectors and discriminators
• Window detectors
• Medical instruments

Procurement Notes

Verify the specific B-grade suffix indicates the 1.24V ±1.75% reference tolerance rather than the A-grade 1.236V ±1% variant. Confirm the open-drain output configuration matches the circuit requirements for mixed-voltage logic levels. Ensure the SOT23-8 footprint aligns with the PCB layout constraints for space-saving designs.

Selection Notes

Select this component when low supply current is critical alongside the need for an onboard reference voltage. The open-drain output requires an external pullup resistor, which allows flexibility in setting logic high levels above the supply voltage. Consider the B-grade tolerance if strict reference accuracy is not required, as it offers cost-effective performance for general threshold detection.

Part Context

This part belongs to the MAX9015–MAX9020 family of nanoPower comparators manufactured by Analog Devices Inc./Maxim Integrated. The family shares common characteristics such as ultra-low power consumption and operation down to 1.8V. Variations within the family include different output stages (push-pull vs. open-drain) and the presence or absence of an internal voltage reference.

Replacement Considerations

Direct substitutes within the same family include the MAX9016BEKA+T, which also features an open-drain output but lacks the internal reference.