Comparator plus reference in a five-pin SOT
The MAX9050BEUK from Maxim Integrated packs a single comparator and a precision voltage reference into a SOT-23-5 package. The comparator's output swings rail-to-rail with CMOS, push-pull, or TTL-compatible drive, and the 8 mA typical output current can directly drive a logic input or a small load.
The 450 ns max propagation delay sets the comparator's response speed for over-voltage, under-voltage, or zero-crossing detection. In a switching power-supply feedback loop or a fast comparator-based window detector, this delay defines the minimum pulse width the circuit can resolve. The 72 µA max quiescent current keeps the part viable for battery-powered equipment where every microamp counts — think portable medical monitors, handheld instruments, or remote sensor nodes running on a coin cell. The ±3 mV internal hysteresis cleans up slow-moving or noisy input signals without external positive feedback components.
Operating from 2.7 V to 5.5 V single supply, the MAX9050BEUK covers 3.3 V and 5 V logic rails directly. Input bias current maxes at 1 pA at 5 V, so high-impedance sources like pH probes or photodiode amplifiers see negligible loading. The 80 dB CMRR and 80 dB PSRR keep the threshold accurate across common-mode shifts and supply ripple.
Package and footprint — five-pin SOT-23
Housed in a SC-74A / SOT-753 package, the MAX9050BEUK occupies roughly the same board area as a single SOT-23 transistor. The supplier device package is SOT-23-5.
Lifecycle and compliance — active, but RoHS non-compliant
The RoHS compliance status is listed as non-compliant, which matters for designs targeting EU RoHS exemptions or legacy Pb-free exemptions. For RoHS-required builds, the RoHS-compliant variant in the same family should be reviewed.