Hi friends,
I’m driving this mosfet with a digital pin. 0-5V in pwm. Load around 1A.
The odd the mosfet overheats within 30sec and starts to throttle its output. It has a rather low RDS on of 65miliohm and should drain easy 4A.
There is a pulldown on the gate of 100k and even tried lowering to 10k.
But issue remains 
Am I forgetting/overlooking something?
Always show us a good schematic of your proposed circuit.
Show us good images of your ‘actual’ wiring.
Give links to components.
In the Arduino IDE, use Ctrl T or CMD T to format your code then copy the complete sketch.
Use the < CODE / > icon from the ‘posting menu’ to attach the copied sketch.
BTW
Write a small sketch to slowly toggle the MOSFET.
Measure the ON and OFF V(ds) voltage, what are these ?
Confirm the HIGH and LOW controller pin output voltages too.
And what's its threshold voltage and gain?
Please supply a link to the data sheet instead of unreadable copies.
They're readable alright.
Looks OK.
Exactly.
Is the MOSFET source connected to Arduino GND? Sometimes people erroneously make the MOSFET circuit effectively float with respect to the Arduino. Vgs that the MOSFET sees must reference to Arduino GND.
Sorry but your data sheet post is fuzzy and not really readable. The most important part is missing. I have to assume at this point it is not wired properly, show a schematic showing exactly how you have wired it. Post links to each hardware item that gives technical details. Also measure the Vgs when it is on and let us know what you get. I know this is a lot of information but if you want a valid answer???
4*4*0.065 = 1.04W, in the best of conditions.
Yes, but I’m loading at 1A so thats even less than 1W
HI, @kevindebosscher
What Arduino controller are you using?
Not enough information.
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Tom.. 
What IS the load?
If you don't understand what a schematic is, please Google to find out. It is not the same thing as a wiring diagram. Hand-drawn is OK. Some bright, sharp photos of the circuit may also be useful.
The thing I see is many of the users do not want to draw schematics yet a large portion of there problems are in the connections, power etc. It appears they spend about a week or so with lots of questions and then maybe, give up, and some get lucky. It is amazing how many problems you find when doing a real labeled schematic including Technical links. That schematic makes them look like a pro. It appears to me that most of the time when a proper schematic is posted the solution is usually within day or so. Good schematic capture software can be gotten for the downloading. Months later a wire comes off, looking at the schematic and putting it back saves lots of headaches.
What is a schematic What Is a Schematic Diagram? How to Read a Schematic - SparkFun Learn
HOW to READ a Schematic: https://www.youtube.com/watch?v=9cps7Q_IrX0&t=15s
KiCad: There are many out there and you will find just like color different people like different colors, some blue, red, ..etc. CAD (Computer Aided Design) programs are like that. You will need to learn a schematic capture program that will work for you.
What are talking about? The schematic part of the mosfet is there…
That snippet of a schematic doesn't show the relevant details of the "Outputs". Is it inductive?
The code driving the "In" can be relevant too-- the frequency of the PWM can matter.
Threads often get only a few replies before people move on, and this one is already above average. Good luck.
Its a small idle valve
Before we used TLE6220gp as outputs
, with way less ideal characteristics. But those are obsoleted so we where looking for a substitute.
The new mosfets fitted are reqs in low rds ,automotive graded and smaller mm2 on the pcb.
Tom..
Build a lab setup of just the MOSFET and the switched device; use a lab power supply to power the device. Use a signal generator or lab power supply for the gate drive signal and verify correct operation. Then start dressing up the system from there, ultimately move to a PCB once you've gotten everything to work in a lab environment.
Alternatively, provide a full schematic of the circuit and a clear description of the operating environment / context, including a clear description/specification of the load, how it's powered, what else is possibly connected to it etc.
Presently there's so much that could be going on, but all we can do is offer wild guesses, which isn't a very efficient way of troubleshooting. So either isolate and reduce number of parameters, or provide more complete information.
We need a schematic of the relevant part of the circuit
The schematic is there!
But will post again
The full logic is running 5V VCC
The triggers are pwm driven at 5V
You have just posted a larger version of that unreadable partial schematic.
There are four resistors shown in your "schematic", only one is clearly labeled with it's identity and value.
You haven't shown the Arduino. (I'm assuming an Arduino is involved, just because you have posted on the Arduino forum - you haven't told us which one it is.)
You haven't shown your mystery load.
Is there anything in your code that you haven't shown us that could be relevant?
For instance, have you changed the PWM frequency to 20kHz?
Let me reciprocate then:
