Dual differential comparator with wide supply range
It compares two analog voltages and outputs a digital logic level, with open-drain outputs that allow wired-OR connections and interface to CMOS, MOS, or TTL logic families.
Key parametric limits for BOM fit
Maximum quiescent current is 2.5 mA per device, which sets the power budget for always-on monitoring circuits. The typical output sink current is 20 mA, enough to drive an LED or a small relay coil through a series resistor. Input offset voltage is 2 mV maximum at 32 V supply, and input bias current is 0.25 µA maximum at 5 V. These figures define the comparator's threshold accuracy in low-side current sensing and zero-crossing detectors. Two independent comparator elements in one 8-SOIC package save board space compared to two single-channel comparators, while the open-drain outputs let multiple comparators share a common pull-up resistor for OR-ed interrupt signals.
The base product number is LM2903, which covers a family of dual comparators with varying temperature grades and package options. The 'AV' suffix denotes the extended industrial temperature range; the 'Q' indicates automotive-qualified (AEC-Q100) devices in the family, though this specific variant's qualification grade should be verified against the datasheet.