AQZ204 Solid state relay
As I read it, the IFon Max rating of 3 mA means that even the least sensistive unit will switch on with 3 mA, while most will switch on at 1 mA (or even less).

IFoff Min of 0.4 mA and Typical of 0.9 mA says most wiil turn off if the LED current falls below 0.9 mA, but some may stay on until the current drops below 0.4 mA