LMC7221AIM/NOPB

Overview

The LMC7221AIM/NOPB is a single-channel analog comparator from Texas Instruments, housed in an SOIC-8 surface-mount package. It operates on a supply voltage ranging from 2.7 V to 15 V with 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. Additional parameters include a common-mode rejection ratio (CMRR) of 75 dB, a power supply rejection ratio (PSRR) of 80 dB, and an input offset current (Ios) of 20 fA. It functions within a temperature range of -40 C to +85 C.

Feature Summary

• Low-power operation suitable for battery-powered applications
• High-voltage capability with wide supply range support
• Rail-to-rail input stage for maximum dynamic range
• Open-drain output configuration for flexible interfacing

Applications

• General-purpose signal comparison circuits
• Battery monitoring systems
• Threshold detection in low-power sensors
• Voltage level shifting interfaces

Procurement Notes

Verify the complete part number including the suffix /NOPB to confirm lead-free compliance and specific tape-and-reel or cut-tape packaging options. Confirm the industrial temperature grade (-40 C to +85 C) matches your environmental requirements. Ensure the SOIC-8 footprint aligns with your PCB design constraints before finalizing procurement orders.

Selection Notes

Select this component when a low quiescent current is critical alongside high-voltage tolerance. The open-drain output requires an external pull-up resistor; ensure the chosen resistor value supports your desired switching speed and logic levels. Compare the 5 mV offset voltage against your application's precision needs, as higher precision may require different families.

Part Context

This device belongs to the LMC7221 series of low-power, high-voltage comparators manufactured by Texas Instruments. It is designed to replace older bipolar comparators in modern CMOS-based designs where power consumption must be minimized without sacrificing voltage headroom. The NOPB suffix indicates it is a lead-free product compliant with RoHS directives.

Replacement Considerations

Check for direct pin-compatible alternatives within the LMC7221 family, such as the LMC7221BIM/NOPB, which may offer tighter electrical tolerances. Verify that any substitute maintains the same SOIC-8 package and open-drain output configuration to avoid schematic modifications.