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MOSFET replacement - how?

Posted by Rayax on June 23, 2005 at 21:13:31:
I want to replace a MOSFET on a power supply board.
Here are its basic ratings:
2A 450V 2.45ohms
It's going to be hard to replace this mosfet with one of the exact same ratings, and this part isn't available anymore. Does anyone know what guidelines I should follow when choosing a replacement?
Here are my assumption (correct me if I'm wrong):
1.-I can exceed the amperage and voltage ratings of the original
2.-I can go lower than the resistance ratings of the original