vams:
Mmm, and may you tell me how i can find/calculate this spec in the datasheet? Cause the only thing i found was that value.
They are usually shown in graph form on most mosfet datasheets. On yours look at the graph named figure 1. The black heavy lines represent different gate/source voltages choices (from 4.5 to 15) and what current they will allow to flow Vs the source voltage applied. Figure 2 is the same but showing the effect of operating at a much higher device temperature. When using a mosfet in a simple switching application (on/off Vs linear amplification) you need to drive the gate voltage high enough to fully saturate the device on so that it will dissapate the smallest amount of heat as possible, and that value is normally 10vdc for standard mosfets and 2-4 volts for 'logic level' mosfets.
Lefty