Replaced by Piotr for now works well for a week, I also put in a better, bigger cooling from an old computer power supply, thanks to which the mosfet does not heat up as much as I went through the check, the original lasted 2 weeks, but as you can see the photos had very poor cooling, so you can easily use this replacement.
Unfortunately, UTT200N03 is available only in wholesale from China, you can not find it anywhere else.
I replaced IRFz44N, but the Soft-Start function has disappeared and the circuit does not respond to speed control. The engines always have full power. When 200N03A was put down, it worked properly. I do not know why spare part numbers do not respond to gate pulses (PWM / analog).
Could you tell me which company is producing these mosfets with the "CR" logo on the component? I asked many sellers, but nobody knows. They only know that it's done in China.
Thank you for your response. Does the Soft-Start function work correctly after installing IRF3305PBF?
As far as the Soft-start function is concerned, it works properly, there are no jerks, the car moves smoothly, the only minus is that in the first and second gear if there is a greater load, the car moves under the hill, it throws gears and blocks the car for 5 seconds from the third gear he goes without problems. But the smooth start function works in every gear