Quad comparator with a 125°C junction ceiling
The LM2901QDRDL is a quad general-purpose comparator from Texas Instruments, built around four independent open-collector comparators in a single 14-SOIC package.
Supply flexibility and output drive
The supply range spans 2V to 30V on a single rail, or ±1V to ±15V split — so the same BOM line works across a 3.3V MCU system, a 5V logic board, and a 24V industrial PLC input card without a rail-specific variant.
Input offset and bias — what to budget
Maximum input offset voltage is 7mV at 5V supply — typical units run lower, but the BOM engineer should budget the full 7mV for threshold accuracy in window comparators or zero-crossing detectors. Input bias current maxes at 0.25µA at 5V, which matters when the source impedance is high (e.g., a resistive divider in a battery monitor) — that 0.25µA across a 100kΩ resistor drops 25mV, eating into the offset budget.