please help with MOSFET

[michael 1978]

Please can somebody help me,

i need to find Vt in mosfet
i dont know formula
of where can i find Vt in graph data

thnx

 

[Audioguru]

What is Vt? Maybe you need to look at VGS(th) in its datasheet. It will be a range of voltages because some Mosfets with the same part number are more sensitive than others.
Here is a clip from a datasheet:

 

[michael 1978]

thank you very much for answer, i am just a beginner,

i so that in datasheet vgs(th), but i dont know is that
because in some books thay say Vt and Vth
Vt means i think when current start to begin to flow
but i make tired searching in google i make stupid searching:thumbsdown:

what do you think is Vt maybe VGS(th) that will be fine, that with be very easy for me, i have 2 books of MICROELECTRONICS but i fin only VGS(th)

thanks

 

[CataM]

Vt=Vth=VGS(th). If your books refer to VGS(th) then are good books because like that appear on datasheets.

The threshold voltage, commonly abbreviated as Vth or VGS (th), of a field-effect transistor (FET) is the minimum gate-to-source voltage differential that is needed to create a conducting path between the source and drain terminals.

https://en.wikipedia.org/wiki/Threshold_voltage

 

[Audioguru]

The current through an ordinary Mosfet when it has its "threshold voltage' is only 0.25mA which very low. The datasheet shows the Mosfet is fully turned on and shows its very low resistance when its Vgs is 10V.
Mosfets that are called "Logic Level" have a lower VGS(th) and Vgs to be fully turned on.

 

[michael 1978]

Thanks to everybody now i know ,


thanks.