mosfet datasheet information sheet

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It is the maximum gate to source thresold voltage. That means it will start to turn ON (start drain to source conduction) atleast before1.8 V and it can operate up to maximum of maximum Vgs.
 

Venkadesh_M said:
It is the maximum gate to source thresold voltage. That means it will start to turn ON (start drain to source conduction) atleast before1.8 V and it can operate up to maximum of maximum Vgs.
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oh.. so does that mean when Vgs(th) > 1.8v, the transistor is in saturation?
 

No that doesnt mean its in saturation. it means it will allow current from drain to source
Code: 
if Vgs > Vt
Id is propotional to (Vgs - Vt)²
The saturation or linear region is depend on Vds and the circuit parameters like Rd or Rs

 

"Linear" and "Saturation" words are the opposite for bipolar transistors and Mosfets. A Mosfet is Linear when it is a turned on switch.
For a Mosfet as a switch you should look at its maximum on-resistance which is listed as 1.25 ohms when the Vgs is 1.8V and the temperature of it is 25 degrees C for this tiny little Mosfet.
 

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