Single comparator with latch — what it is and where it fits
The Maxim Integrated MAX9203EKA+T is a single comparator with a latch output, packaged in an SOT-23-8 for surface-mount assembly. The latch holds the comparison result on the TTL output until the latch-enable signal resets it, making this part suited for sampled-data systems — zero-crossing detectors, window comparators, and overcurrent trip circuits where the decision must be held for a controller read cycle. The wide supply range (4.75 V to 10.5 V single, or ±2.375 V to ±5.75 V dual) lets it drop into existing 5 V or ±5 V rails without a local regulator. With 86.02 dB typical CMRR and PSRR, it rejects supply ripple and common-mode noise common in motor-drive and industrial-control backplanes.
Industrial temperature rating — deployment context
Rated for -40°C to 85°C, this comparator handles outdoor telecom cabinets, factory-floor sensor interfaces, and engine-bay electronics without derating. The SOT-23-8 footprint keeps board area small, but the thermal path is through the leads — ensure adequate copper on the pads for heat spreading if the part is near a hot regulator or power stage.
Quiescent current and input bias — what they mean for the BOM
Maximum quiescent current is 2 mA (with lower bins at 1.6 mA and 800 µA), so the part adds negligible load to a 5 V or ±5 V rail — fine for battery-backed or low-power supervisory circuits. Input bias current maxes at 5 µA at ±5 V, and input offset voltage at 4 mV at ±5 V. These are typical for a general-purpose comparator; for precision threshold detection below a few millivolts, you would need a zero-drift or chopper-stabilised alternative.
Lifecycle and compliance
The MAX9203EKA+T carries an Active lifecycle status and is ROHS3 compliant.