10.5 kHz GBW and 1.9 µA — the trade-off you need to know
Its headline number is the total supply current of 1.9 µA across both channels — that is the reason you pick this part over a faster, hungrier amplifier. If your design needs to condition a 1 kHz sensor output or buffer a slow analog reference, this part fits. If you are filtering audio or closing a control loop above 10 kHz, it does not — and that is the selection mistake this part exists to avoid.
Supply range and output swing — rail-to-rail on the output only
The LMC6442IMX/NOPB operates from a supply span of 1.8 V to 11 V, covering single-cell lithium-ion and standard 5 V or 9 V rails. The output swings rail-to-rail, which is useful when driving an ADC input near the supply limits. Each channel can deliver 2.1 mA of output current, enough to drive a reference input or a light load, but not a speaker or relay coil.
The suffix /NOPB indicates lead-free (no Pb) plating, which is the modern standard. If you are maintaining a BOM that originally specified the LMC6442IM (non-NOPB), the difference is the lead-free finish — electrically identical, but verify your soldering profile for the lead-free reflow temperature.