LMC7221AIM5

Overview

The LMC7221AIM5/NOPB is a micropower CMOS analog comparator manufactured by Texas Instruments, housed in a space-saving 5-pin SOT-23 package. 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 operating current of 14 µA. Key electrical parameters include a maximum response time of 4 µs, an input offset voltage of 5 mV, and an input bias current of 0.4 pA. It provides a common-mode rejection ratio (CMRR) of 75 dB and a power-supply rejection ratio (PSRR) of 80 dB. The component supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• Micropower CMOS architecture designed for low energy consumption applications
• Rail-to-rail input stage allowing full signal swing utilization
• Open-drain output structure compatible with various logic families
• High impedance inputs minimizing circuit loading effects

Applications

• Battery-powered instrumentation systems requiring minimal quiescent current
• Threshold detection circuits in portable electronic devices
• General-purpose voltage monitoring and level shifting applications

Procurement Notes

Verify the specific suffix designation, as the LMC7221AIM5/NOPB is listed as obsolete or end-of-life by major distributors. Confirm availability of alternative packages such as the SOIC-8 variant if surface-mount density constraints allow. Ensure compliance with RoHS directives and check for any pending product change notices regarding manufacturing site transfers before finalizing procurement plans.

Selection Notes

Select this component when ultra-low power consumption is critical alongside high input impedance requirements. The open-drain output necessitates an external pull-up resistor, which must be sized according to the desired switching speed and load capacitance. Consider the 4 µs propagation delay when designing high-speed timing circuits, as it may limit performance in fast-switching environments compared to faster comparator alternatives.

Part Context

This part belongs to the LMC7221 family of tiny CMOS comparators from Texas Instruments. It shares core specifications with variants like the LMC7221AIM/NOPB but differs in physical packaging, utilizing the compact SOT-23 form factor instead of larger options. The series is characterized by its ability to operate at low voltages while maintaining high input impedance, making it suitable for modern miniaturized electronics where space and power are constrained.

Replacement Considerations

Public records indicate the LMC7221AIM5/NOPB is obsolete. Potential substitutes include the LMC7221AIM/NOPB in an SOIC-8 package or the LMC7211AIM5X, though the latter features a push-pull output rather than open-drain. Verify pinout compatibility and output stage differences before implementing any cross-replacement.