mosfet datasheet information sheet

[flabbergastt]

hi guys,

I'm looking at a specific data sheet at the moment

https://www.vishay.com/docs/71166/71166.pdf

at the top of the data sheet it shows "N-Channel 1.8V (G-S) MOSFET"

what exactly does the 1.8v (G-S) imply? and why is it important?

- Sorry if the question is silly!

thanks.

 

[Venkadesh_M]

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.

 

[flabbergastt]

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.

oh.. so does that mean when Vgs(th) > 1.8v, the transistor is in saturation?

 

[Venkadesh_M]

No that doesnt mean its in saturation. it means it will allow current from drain to source

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

 

[Audioguru]

"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.