Re: Maximum current for TO-220 package 75-95A, and how to connect heavy leads

Tony Williams wrote:
In article <127nnipbsb9vm6c@xxxxxxxxxxxxxxxxxx>,
Paul E. Schoen <pstech@xxxxxxxxx> wrote:

I am researching high current power MOSFETs for my DC-DC
converter and motor control applications. There are some with ON
resistance as low as 0.0024 ohms (IRF2903Z) which is rated 260
amps (silicon limited) but package limited in TO-220AB to 75 A.
An IRFBA90N20D has 0.023 ohms and is limited to 95 amps by its
"Super-220" package, which does not have a mounting tab, and has
three leads about 1.0 x 1.2 mm. The TO-220AB has leads about 0.6
x 0.9 mm. Wire of that size would probably be rated no more than
about 10 amps, but I suppose the ratings assume the leads are
very closely attached to a heavy PCB trace or other thermally
conductive connector.


Why not use MOSFETs in the ISOTOP package. OK it costs
more, but you don't have the expense of a pcb layout and
the fiddling around to make decent-sized connections.
ISOTOP is also easy to heatsink, with a lovely low
overall thermal resistance.


Or SEMITOP

Cheers
Terry
.

Relevant Pages

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    ... resistance as low as 0.0024 ohms which is rated 260 ... An IRFBA90N20D has 0.023 ohms and is limited to 95 amps by its ... "Super-220" package, which does not have a mounting tab, and has ...
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