How to read the datasheet of a Digital transistor?
According to the datasheet, the typical values are &lt;1.2V for OFF. and >2V for ON.

The datasheet shows the internals of the transistor, which looks like this (a rough approximation using a typical NPN) R2 and R3 are internal to the transistor. R1 is not part of the transistor, it's just a typical load to work against for the simulation:



If we sweep the input voltage from 0 to 3V (x axis) we can see the transistor begin to turn on around 1.2V and be almost fully saturated around 2V, which is roughly what datasheet states: