Comparator selection note: LMC7221BIMX/NOPB
It is designed for low-power threshold detection, zero-crossing detectors, and sensor interface circuits where the output must pull to a different rail than the supply. The open-drain output allows wired-OR connections and level shifting to higher or lower logic voltages via an external pull-up resistor. Key parametric strengths include a maximum quiescent current of 14 µA, making it suitable for battery-powered and energy-harvesting systems, and an input bias current of just 0.04 pA at 5 V, which preserves signal integrity when interfacing with high-impedance sources like pH probes or photodiode amplifiers.
With a maximum propagation delay of 10 µs, this comparator is not intended for high-speed switching or PWM feedback loops. It is a good fit for DC threshold alarms, over-temperature detection, or low-frequency window comparators where response time in the tens of microseconds is acceptable. The 75 dB CMRR and 80 dB PSRR provide decent rejection of common-mode and supply noise in industrial environments.
Package and footprint
Available in Tape & Reel (TR) for volume pick-and-place or Cut Tape (CT) for prototype quantities.