Dual comparator in an 8-pin SOIC — signal-chain fit
The MAX907CSA+ is a dual, general-purpose comparator from Analog Devices in an 8-SOIC package. It compares two analog voltage levels and outputs a TTL-compatible logic signal — a standard building block for threshold detection, zero-crossing detectors, and window comparators in mixed-signal boards. With a 50 ns maximum propagation delay, this part handles signal frequencies up to roughly 10 MHz before the output edge timing becomes the limiting factor in the loop. The 4.5 V to 11 V single-supply range, or ±2.25 V to ±5.5 V split supply, means it runs from common 5 V or 10 V rails without a secondary regulator.
Parametric limits that govern the BOM decision
The 2 mV maximum input offset voltage at 5 V sets the DC accuracy floor — for a 10 mV threshold, the trip point can shift by up to 20 % from the nominal value, so the upstream signal chain must budget this error. The 0.3 µA maximum input bias current at 5 V is low enough that a 10 kΩ source resistor drops only 3 mV, negligible for most sensor interfaces. Typical CMRR and PSRR are both 86.02 dB — this means common-mode and supply-rail noise are attenuated by roughly 20,000:1, so a 100 mV ripple on the supply rail produces under 5 µV of referred error at the comparator input. The 1 mA maximum quiescent current per channel keeps the total power draw under 11 mW from a 5 V rail.
Active lifecycle and compliance documentation
This limits deployment to indoor, temperature-controlled environments — not suitable for automotive or industrial enclosures without active cooling.