Tayda Electronic Logic level MOSFET

[hk_jh]

I'm looking at the tayda page of MOSFET
I can't find any logic level mosfet there.
Does anyone order a logic level mosfet from them?

[hk_jh]

they do sell the IRF44N -
Looking at is data sheet it seems that it should be a logic level mosfet as Vgs(th) is between min of 2V and Max of 4V meaning any signal at the gate above 4V will open the mosfet completely and a current will be able to flow between Drain and Source, right?

[PaulRB]

@hk_jh

any signal at the gate above 4V will open the mosfet completely

No. The gate will begin to open above the threshold, which could be as high as 4V.

[Grumpy_Mike]

I have told you before this is not a logic level FET

@hk_jh

as Vgs(th) is between min of 2V and Max of 4V meaning any signal at the gate above 4V will open the mosfet completely

No anything under 4V could turn off the FET. This parameter is about fully turning off the FET not fully turning it on.
Look at the source to drain resistance figure, you will see it needs 10V to fully turn it on.

[hk_jh]

@Grumpy_Mike

No anything under 4V could turn off the FET. This parameter is about fully turning off the FET not fully turning it on.
Look at the source to drain resistance figure, you will see it needs 10V to fully turn it on.

Any logic level from Tayda list?

[Grumpy_Mike]

@hk_jh

Any logic level from Tayda

I have no idea who Tayda are. A link would be good.

[hk_jh]

Sorry, here is a link to their MOSFET list

[Grumpy_Mike]

This one
Logic level FET

Notice that the current it will pass is reduced with a 4v5 signal level,as opposed to a 10V signal level but this is not an issue for you.

[hk_jh]

Is it possible to use PC814 AC optocoupler instead of PC817 with a DC signal from an arduino?
I'm looking for 1 channel optocoupler from TaydaElectronics and the pc814 is the onlyone I have found

[Grumpy_Mike]

@hk_jh

Is it possible to use PC814 AC optocoupler instead of PC817 with a DC signal from an arduino?

Yes.
But what is the circuit you want to use it in? They both only have a 50mA maximum current.

[hk_jh]

general circuit like that one for driving a mosfet to drive a solenoid/motor etc

[Grumpy_Mike]

Why do you think you need an opto isolator to do this job? I can't see the point in it myself unless GND2 is floating with respect to GND1.

[hk_jh]

for extra safety for preventing current to flow from the solenoids back to the arduino(?)
using the optocoupler will isolate the arduino from the solenoid completely isn't it?

[Grumpy_Mike]

@hk_jh

for extra safety for preventing current to flow from the solenoids back to the arduino

Why would it do that?
Is Vcc1 connected in any way to a supply that powers anything else? If it is there is zero point in having an isolated ground, because there wouldn't be one.

You would need to show the whole circuit to make sure, not just an arbitrary piece of schematic. In the past you have not been good at supplying schematics that show the whole of the picture.

[TomGeorge]

Hi,
What is the application?
What environment will your project be working in?

Thanks.. Tom...

[hk_jh]

@Grumpy_Mike

Is Vcc1 connected in any way to a supply that powers anything else? If it is there is zero point in having an isolated ground, because there wouldn't be one.

It is not connecting to anything else. only for one of the solenoid terminals and to the collector leg of the optocoupler.

@Grumpy_Mike

You would need to show the whole circuit to make sure, not just an arbitrary piece of schematic. In the past you have not been good at supplying schematics that show the whole of the picture.

I don't have anything in praticular, I wanted to build a general purpose circuit to drive solenoids or dc motors using an arduino..

@TomGeorge

Hi,
What is the application?

driving solenoid or dc motors

@TomGeorge

What environment will your project be working in?

arduino (if I understand your question)

[Grumpy_Mike]

@hk_jh

I don't have anything in praticular, I wanted to build a general purpose circuit to drive solenoids or dc motors using an arduino

I started answering this thread which was about a specific request about a FET.
I did not sign up for to give you a tutorial about designing general purpose circuit to drive solenoids or dc motors.

So I will just leave it here.

[hk_jh]

True. Thanks for your kind help!