Quad comparator with a 2 V to 30 V supply rail
The LM2901DRG3 is a quad general-purpose comparator from Texas Instruments, packing four independent voltage comparators into a 14-SOIC package. Its open-collector outputs let you wire-OR multiple comparators and shift levels between 5 V logic and a 24 V PLC input card without extra translation. Supply range spans 2 V to 30 V single-ended or ±1 V to ±15 V dual, so it runs off a 3.3 V microcontroller rail or a 24 V industrial bus with the same pinout.