Dual comparator in a tight SOT-23-8 footprint
The Maxim Integrated MAX9022AKA+T is a dual, general-purpose comparator that packs two independent comparators into an 8-pin SOT-23-8 package. The output stage is CMOS with rail-to-rail swing and TTL-compatible levels, so it interfaces directly with logic inputs without a pull-up resistor. Propagation delay is 8µs maximum — fast enough for most supervisory and sensor-conditioning loops, though not intended for high-speed switching or clock recovery.
The 4mV internal hysteresis cleans up slow-moving or noisy input signals without external positive feedback components. Input offset voltage is trimmed to 1mV maximum at 5V, which sets the practical resolution floor for the comparison point. Combined with 100dB CMRR and 80dB PSRR, the trip voltage stays stable across the 2.5V to 5.5V supply range and common-mode shifts — important when the comparator is powered from an unregulated battery or a noisy switching rail. Input bias current is a microscopic 0.003µA maximum at 5V, so high-impedance sources like a voltage divider using megohm resistors won't see significant loading error. That's the spec that lets you use large resistor values to keep the divider's self-discharge negligible in a battery-powered system.
The SOT-23-8 package's low thermal mass means it tracks ambient quickly — no significant self-heating at 5µA draw.