Re: Maximum current for TO-220 package 75-95A, and how to connect heavy leads
- From: bob <bob@>
- Date: 31 May 2006 19:52:02 -0500
On Tue, 30 May 2006 08:12:02 -0700, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Tue, 30 May 2006 01:55:06 -0400, "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.
IR does this, and it's insane. The large print says X amps, and the
fine print says X/3 or something. Who cares what the silicon is rated
for?
Personally, I wouldn't run a TO-220 at more than 25 amps or
thereabouts. TO-247's are better, but more cheap fets is prudent, as
compared to trying to get huge currents through bleeding-edge parts.
I would need something like #10 or #8 AWG to come even close to 75-95 amps.
What is the best way to make such a connection?
Again, more small fets allows you to keep all the connections on a pc
board and save a lot of hassle.
John
Many years ago, I watched Phantom test the breaking point of a
TO-220 FET leg. It was at about 150 Amps DC that it went fizz like
a fuse.
bob
.
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