Quad comparator with 25 ns propagation delay — signal-chain fit
The Maxim Integrated MAX9108ESD+ is a quad general-purpose comparator packing four independent comparators into a single 14-SOIC package. Its 25 ns maximum propagation delay makes it a candidate for high-speed threshold detection, zero-crossing circuits, and fast overcurrent or overvoltage fault sensing where the decision needs to land within one or two clock cycles of a moderate-speed microcontroller. The supply range is 4.5 V to 5.5 V single supply. TTL-compatible outputs simplify interfacing to 5 V logic families without level translation. Industrial temperature grade (-40°C to 85°C) suits outdoor telecom cabinets, factory automation panels, and under-hood automotive auxiliary circuits where the ambient can swing hard.
25 ns — what the propagation delay buys you
At 25 ns max, this comparator can resolve a 40 MHz input transition. That is fast enough for switching power supply feedback loops, high-speed data line receivers, and pulse-width measurement on encoder outputs. The trade-off is quiescent current: 700 µA max across all four channels, which is modest for the speed class but not a micropower part. Input offset voltage is trimmed to 1.6 mV max at 5 V, and input bias current stays under 0.125 µA — both tight enough for precision threshold setting without external trimming in most industrial signal chains. CMRR and PSRR both sit at 86.02 dB typical, meaning the comparator rejects common-mode noise and supply ripple well, so the decision threshold stays stable even on a noisy 5 V rail.
14-SOIC package — rework and layout notes
The 14-SOIC (0.154" body width, 3.90 mm) is a standard footprint, easy to route on two-layer boards.
Lifecycle and sourcing — active, no LTB pressure
ROHS3 compliant. That means it is safe to qualify into a new production BOM or to replenish a sustaining line without worrying about a last-time-buy window closing.