MAX9120ESA

Overview

The MAX9120ESA+ is a nanopower analog comparator in an 8-pin SO package. It operates on a supply voltage range of +1.6V to +5.5V with a typical supply current of 350nA at +1.6V. The device features Beyond-the-Rails inputs extending 200mV beyond the supply rails and includes internal hysteresis for clean switching. It utilizes an open-drain output stage capable of sinking up to 35mA, suitable for mixed-voltage logic translation.

Feature Summary

• Ultra-low power consumption with 350nA supply current
• Beyond-the-Rails input capability extending 200mV past supply rails
• Open-drain output stage supporting mixed-voltage system designs
• Internal hysteresis ensures stable switching without external components

Applications

• Two-cell battery monitoring and management systems
• Logic-level translation between different voltage domains
• Threshold detectors and discriminators
• Zero-crossing detection circuits

Procurement Notes

Verify the specific suffix 'ESA+' corresponds to the 8-pin SOIC package variant rather than the SC70 version. Confirm RoHS compliance status as indicated by the plus sign. Ensure the design accounts for the open-drain output requirement for an external pull-up resistor when interfacing with higher voltage logic levels.

Selection Notes

Select this component when low quiescent current is critical for battery life. Choose the open-drain configuration if wire-OR logic or level shifting is required. 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 alternatives.

Part Context

This part belongs to the MAX9117–MAX9120 family of nanopower comparators designed for space-constrained, low-power applications. The MAX9120 specifically denotes the variant without an internal reference voltage and with an open-drain output. It shares the same core architecture as the push-pull MAX9119 but offers flexibility for mixed-voltage interfaces.

Replacement Considerations

Direct replacements within the same family include the MAX9119EXK+T (SC70, push-pull) or MAX9119ESA+ (SO, push-pull). Note that these variants feature push-pull outputs instead of open-drain, which may require circuit adjustments.