LMC7221AIMX

Overview

The LMC7221AIMX is a single-channel CMOS analog comparator manufactured by Texas Instruments. It features rail-to-rail input capability and an open-drain output configuration. The device operates within a supply voltage range of 2.7 V to 15 V, with a typical quiescent current of 14 µA. Key electrical specifications include a maximum input offset voltage of 5 mV and an input bias current of 0.4 pA. The component supports a common-mode rejection ratio of 75 dB and a power supply rejection ratio of 80 dB. It functions reliably across an operating temperature range from -40°C to +85°C.

Feature Summary

• Rail-to-rail input stage allows signal detection near both supply rails.
• Open-drain output structure provides flexibility for interfacing with various logic families.
• Low power consumption design suitable for battery-operated applications.

Applications

• Battery-powered monitoring systems
• Threshold detection circuits
• Over-voltage protection schemes

Procurement Notes

Verify the specific suffix 'MX' indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets. Ensure the selected variant matches the required operating temperature range and package type for your specific PCB layout constraints.

Selection Notes

Select this component when rail-to-rail input sensitivity is required alongside low power consumption. The open-drain output necessitates an external pull-up resistor; ensure the chosen resistor value aligns with the desired switching speed and load requirements. Compare against the LMC7211 if a push-pull output is preferred instead of open-drain.

Part Context

This part belongs to the LMC72xx series of tiny CMOS comparators from Texas Instruments. It shares architectural similarities with the LMC7211 but differs in output topology. The series is designed for general-purpose comparison tasks where space and power efficiency are critical constraints in embedded designs.

Replacement Considerations

The LMC7221AIMX/NOPB is a direct equivalent variant with identical functionality and pinout. Verify that any substitute maintains the open-drain output characteristic, as push-pull alternatives like the LMC7211 require circuit adjustments.