Hello Guys ,
I'm using mosfet IRF540N with voltage 5V sinusoidal 50Hz and 0.5A .
My problem is that the mosfet is overheating. What's exactly the problem?

 

hi phy,
A circuit sketch would help us, help you.
E

 

Please include wave forms, even hand drawn. If you can.

 

My problem is that the mosfet is overheating. What's exactly the problem?

The problem is that it is dissipating too much power.
That's all we can tell you from the meager information you have provided.

If you want exact answer then you need to show us the exact circuit and how exactly it is being used.