LMC7221AIMX/NOPB

Overview

The LMC7221AIMX/NOPB is a single-channel analog comparator manufactured by Texas Instruments, housed in an SOIC-8 surface-mount package. It operates within a supply voltage range of 2.7 V to 15 V and draws a typical operating current of 14 uA. Key electrical specifications include a response time of 4 us, an input offset voltage (Vos) of 5 mV, and an input bias current (Ib) of 0.4 pA. The device features rail-to-rail inputs and an open-drain output. It provides a common-mode rejection ratio (CMRR) of 75 dB and a power supply rejection ratio (PSRR) of 80 dB. The component functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Ultra-low input bias current capability with specified values down to femtoampere levels for high-impedance sensing applications.
• Rail-to-rail input stage allows operation with input signals extending to the supply rails.
• Open-drain output configuration facilitates flexible interfacing with various logic families.
• Low power consumption design suitable for battery-operated or energy-efficient systems.

Applications

• High-impedance sensor signal conditioning
• Threshold detection circuits
• Battery monitoring systems
• General-purpose voltage comparison

Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the 'A' grade designation corresponds to the specified industrial temperature range and performance parameters. Ensure the SOIC-8 package dimensions match the target PCB footprint requirements. Cross-reference the datasheet revision date to ensure alignment with current manufacturing specifications.

Selection Notes

Select this component when low input bias current and rail-to-rail input compatibility are required in a single-channel configuration. Consider the 4 us response time for speed-sensitive applications. Evaluate the open-drain output against system logic level requirements. Compare power consumption metrics against other comparators if battery life is a critical constraint.

Part Context

This part belongs to the LMC7221 series of low-power, high-voltage comparators from Texas Instruments. It is designed for applications requiring minimal quiescent current while maintaining accurate voltage comparison capabilities. The series typically includes variants with different package options and temperature grades, sharing core electrical characteristics such as low input bias current and wide supply voltage tolerance.

Replacement Considerations

Consult official substitution guides for direct pin-compatible alternatives within the Texas Instruments portfolio. Verify that any substitute maintains the same open-drain output type and rail-to-rail input specifications. Ensure thermal and electrical ratings meet or exceed the original component's limits for the intended application environment.