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Drain Source on state resistance
0.27 Ohms
When the gate voltage is 10V
A modern power FET will have something like 0.020 Ohms or less
A logic level would say when the gate voltage is 5V.
This FET is a very very poor choice, and it won’t even work because your Arduino can’t produce enough voltage to turn it on.
You are being had, that is an outrageous price for that part.
OK I'll look for some IRL540, IRLZ44N and RFP30N06LE on Amazon and Ali.
Thank you
Thank you for the spec sheet reference, this is very confusing for a noob like me, especially when I see a YouTube video like this IRF520 MOSFET controlled by Arduino
Yea semiconductor specification take some time to learn their meaning.
There are charts in the specification for better prediction of how the Mosfet will work under varying conditions but a quick check is Vgs(th) which is the voltage needed to just start the Mosfet turning on.
The above tells us that at 3 to 4 volts, the mosfet will only allow 250µA to flow.
and you need a Vgs of 10 volts to get the mosfet down to 0.115 ohms.
BTW, this is a very old design and sufferers from the limitations of the state of the art at that time. I think this part was introduced in early 2000.
Yes YouTube has no one checking he contents so it is a playground for the self deluded. I believe a lot of cooking videos have things in them that simply do not work. They all tend to copy each other, hence the high level crap rating of a lot of them. Ask yourself would you buy a used car from this person? He even says you need 10V to turn it on and then totally ignores this fact. What an idiot.
So hard when you don't know a lot ... problem is I might not from that guy but would from the guy who wrote this article Done Workshop IRF520 and did this video Drone Workshop MOSFET showing using a UNO with a IRF520 module similar to my setup. Kind of disappointed to hear that the Drone Workshop videos are not correct, I have been watching them for a while to learn how to use different Arduino modules and it was this video that got me looking at the IRF520.
I appreciate all the help.
One last question ... any thoughts on the IRF3708 which was in this video I enjoyed ... IRF3708 recommended by Andreas Spiess
Yes, the IRF3708 is a reasonable MOSFET to use.
Used the IRF3708 many times @5v Vgs with great results.
Vgs max is 12v so keep this in the back of you mind.
Thanks for feedback on IRF3708 ... I'll see about getting a couple to have. Thanks also for pointing out Amazon, definitely a good choice for next day delivery but I do find Ali is way cheaper for the same thing when it comes to electronics parts.
Now you are becoming addicted to the hobby !
One for your project 
, one for the garbage can 
, 5 for future projects .
Did you not like the IRF7401 I suggested on Aliexpress?
Going to get a couple of those as well. Thank you for the link.
