MAX9120ESA-T

Overview

The MAX9120ESA-T is a single-channel nanopower analog comparator manufactured by Analog Devices Inc./Maxim Integrated. It operates on a supply voltage range of +1.6V to +5.5V with a typical supply current of 350nA. The device features an open-drain output stage capable of sinking up to 35mA and sourcing limited current, suitable for mixed-voltage logic interfacing. Input common-mode voltage extends 200mV beyond the supply rails (VEE - 0.2V to VCC + 0.2V). It includes internal hysteresis of 4mV to prevent oscillation. The component is housed in an 8-pin SO package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Ultra-low power consumption with 350nA supply current
• Beyond-the-Rails input voltage range extending 200mV past supply rails
• Open-drain output stage compatible with mixed-voltage systems
• Internal hysteresis ensures clean switching without external components

Applications

• 2-cell battery monitoring and management
• Threshold detectors and discriminators
• Sensing at ground or supply line
• Logic-level translation between different voltage domains

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm the 'ESA' designation corresponds to the 8-pin SO package variant rather than the SC70 version. Ensure compatibility with the required open-drain output configuration for your specific circuit design needs.

Selection Notes

Select this component when low quiescent current is critical for battery life. Choose the open-drain output variant if interfacing with logic families requiring pull-up resistors or mixed-voltage operation. Verify that the propagation delay characteristics meet the timing requirements of the application, as nanopower comparators typically exhibit slower response times compared to high-speed devices.

Part Context

This part belongs to the MAX9117–MAX9120 family of nanopower comparators designed for space-constrained, low-power applications. While the MAX9117/MAX9118 include an internal reference and push-pull outputs, the MAX9120 specifically omits the reference and utilizes an open-drain output structure. This differentiation allows designers to optimize power and pin count based on whether an internal reference is needed.

Replacement Considerations

Direct replacements within the same family include the MAX9118ESA+ which shares the open-drain output but adds an internal reference. Other single-channel comparators from the manufacturer may serve as alternatives if package or electrical specifications differ.