LMC7221BIM

Overview

The LMC7221BIM is a single-channel analog comparator from the Texas Instruments LMC7211 family, housed in an SOIC-8 surface-mount package. It operates on a supply voltage range of 2.7 V to 15 V with a typical quiescent current of 14 uA. The device features a push-pull output capable of sourcing or sinking 45 mA per channel. Key electrical specifications include a maximum input offset voltage of 5 mV, an input bias current of 0.4 pA, and a propagation delay of 4 us. Common-mode rejection ratio is specified at 75 dB, while power supply rejection ratio reaches 80 dB. The component supports a common-mode voltage down to -200 mV and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Rail-to-rail input capability allowing operation near supply rails
• Push-pull output stage providing active drive for both logic states
• Ultra-low input bias current suitable for high-impedance signal sources

Applications

• Battery-powered monitoring systems requiring low quiescent current
• Threshold detection circuits in industrial instrumentation
• Signal conditioning interfaces for microcontroller inputs

Procurement Notes

Verify the specific suffix against the manufacturer's official datasheet to confirm pinout compatibility and electrical tolerances. Ensure the ordering part number matches the required package variant and temperature grade. Cross-reference the component marking code with the latest production data to avoid counterfeit or obsolete stock. Confirm RoHS compliance status through the official product page before finalizing procurement orders.

Selection Notes

Select this component when a rail-to-rail input comparator with a push-pull output is required. The LMC7221 differs from the LMC7211 by its output topology; choose this part if active pull-up and pull-down capabilities are necessary for driving loads directly. Consider the 14 uA supply current for battery life calculations and the 45 mA output drive strength for interfacing with digital logic families without additional buffering.

Part Context

This device belongs to the LMC7211 series of tiny CMOS comparators manufactured by Texas Instruments. It shares the same internal architecture as the LMC7211 but utilizes a different output stage configuration. The series is designed for general-purpose applications where low power consumption and wide supply voltage ranges are critical design constraints.

Replacement Considerations

LMC7221BIM/NOPB: Direct equivalent with identical electrical characteristics and pinout.

FAQ

What is the difference between LMC7211 and LMC7221?

The primary difference is the output stage. The LMC7211 features a push-pull output, while the LMC7221 typically features an open-drain output. Verify the specific datasheet for the exact output type of the LMC7221BIM variant.

Can the LMC7221BIM handle negative common-mode voltages?

Yes, the device supports a common-mode voltage range that extends to -200 mV below the negative supply rail.