MAX9120ESA+

Overview

The MAX9120ESA+ is a nanopower comparator in an 8-pin SO package, operating from +1.6V to +5.5V with 350nA supply current. It features Beyond-the-Rails inputs extending 200mV past the rails and an open-drain output capable of pulling up to 6V above VEE. The device includes internal hysteresis for clean switching and crowbar-current-free operation. It operates over an extended temperature range of -40°C to +85°C.

Feature Summary

• Ultra-low power consumption with 350nA supply current
• Beyond-the-Rails input voltage range extends 200mV beyond supply rails
• Open-drain output stage suitable for mixed-voltage logic translation
• Internal hysteresis prevents oscillation during slow signal transitions

Applications

• 2-cell battery monitoring and management systems
• Logic-level translation between different voltage domains
• Threshold detectors and discriminators
• Zero-crossing detection circuits
• Sensing applications at ground or supply lines

Procurement Notes

Verify the specific suffix 'ESA+' indicates a lead-free package compliant with RoHS standards. Confirm the package type matches the required 8-pin Small Outline (SO) footprint for PCB layout compatibility. Ensure the open-drain output configuration aligns with the system's pull-up requirements and voltage levels.

Selection Notes

Select this component when ultra-low quiescent current is critical for battery life. Choose the open-drain output variant if interfacing with mixed-voltage logic systems requiring level shifting. Verify that the 350nA current draw meets strict power budgets compared to the 600nA reference versions.

Part Context

This device belongs to the MAX9117–MAX9120 family of nanopower comparators. While the MAX9117/MAX9118 include an internal 1.252V reference, the MAX9120 lacks this feature to minimize current consumption. It shares pinout compatibility with other family members but differs in output stage configuration and reference integration.

Replacement Considerations

Pin-compatible alternatives within the same family include the MAX9119EXK-T for SC70 packages with push-pull outputs. For direct replacements in SO packages, verify availability of equivalent nanopower comparators with matching input ranges and output drive capabilities.

FAQ

What is the maximum voltage the open-drain output can withstand?

The open-drain output can be pulled up to an absolute maximum of 6V above VEE.

Does the MAX9120 have an internal voltage reference?

No, the MAX9120 does not include an internal reference; it requires external threshold setting components.

How does the device handle overdriven inputs?

The comparator inputs are protected by internal ESD diodes and do not exhibit phase reversal when overdriven beyond the supply rails.