IRF520 Amp Rating which to buy

[Low_Boy]

I am out of IRF520's and need to order more. Looking at mouser they have 3 different ratings. All are 100 Volt but there are 3 different amp ratings,14 Amp, 9.7 Amp and 9.2 Amp. will one work better that the other or is one better that the others?
After looking at a RF Parts data sheet I am thinking factory uses the 100V 9.2A?

 

[Tallman]

Check Alltronics
http://www.alltronics.com/cgi-bin/category.cgi
In the search bar type "Power FET" and it takes you to pages of high amperage fet's.
I will point out putting a 60 amp mosfet in a device not setup for that level power will not be a good thing. The support circuits might not be strong enough, ie: circuit board traces, inductors, etc.

 

[Low_Boy]

One of my thoughts exactly.

 

[Tallman]

Here is another: https://www.allelectronics.com/index.php?page=seek&id[m]=pattern&id[q]=power+fet

If you used a 20 amp fet that is Enhanced mode that is good. Almost all fet's in power supplies are enhanced mode, that simply means the fet is allowing a small amount of DC magnetizing current to keep fields built up.