Can anyone tell me the difference between the drive voltage and the gate-to-source threshold voltage (Vgs,th) of a MOSFET, if any?
I was under the impression that these refer to the same voltage - the voltage that is needed to turn the MOSFET 'on'. However, if you look at the following datasheet for a Fairchild MOSFET...you'll see that the title says "2.5V Specified", which I understand refers to the drive voltage. However, under the "On Characteristics," you'll see Vgs(th) min. = 0.4V and Vgs(th) max. = 1.5V. Why isn't Vgs(th) max. = 2.5V, as the title suggests? Is there a difference between Vgs(th) and the "specified voltage"?