Unknown SMD transistor

I have a smd transistor but i can't find any datasheet. I't a little bit bigger than normal SMD transistor. It is marked N1 Y2 (on another MB there is an equivalent marked A016). It is near the ATX connector of a PC mainboard. Can it be a N-ch mosfet 0.3A 20V? Can you suggest a substitute? Thank you in advance. Slang snipped-for-privacy@tin.it