Which transistor I should use to switch 12V 0.8A? I am have circuit with Arduino NANO and I need to control air valve, which is powered with 12 Volts and 0.8 Amper. Problem is that Arduino NANO is powered with 5 volts. I want to use transistor to achieve it. Which one the best option in this case ?

Thank you for help

PS: I need ON/OFF states only.

PSS: I want to use transistor, not relay, because transistors are quicker.
If you look for "transistor" using the search box on this website, you'll find hundreds of results.

Here are a few examples that will answer your question.

Using a MOSFET

Using a TIP120 Transistor