Rth junction->case 50C per watt!
At 50C per watt, even if you run it at the insane temperature of 175C,
you're only dissipating 3.5 watts. About 40 amps at Rds=2.2mOhm.
IXYS has much better data sheets showing you realistically what you can
expect from their parts, IMO. You pay for it though if you use IXYS.
-
Martin

Alan B. Pearce wrote:
>> Of course for most general purpose low frequency switching applications,
>> the newer types are wonderful, especially as you get up in current into
>> the hundreds of mA or A.
> 
> Your saying that, this lunchtime I was perusing the latest issue of 
> Electronics Weekly, where there is a press release from STMicroelectronics 
> for the STV250N55F3 Mosfet.
> 
> 250A, 1.5mohm PowerSO-10 package rated for 300W @ 25C.
> 
> Suggested uses high current electric traction applications such as fork lift 
> trucks, wheelchairs and electric bikes ...
> 
> Impressive looking package in the pictures.
> 
> Press release at 
> http://www.st.com/stonline/stappl/cms/press/news/year2008/p2308.htm
> 
> Data at 
> http://www.st.com/stonline/stappl/productcatalog/app?path=/comp/stcom/PcStComRPNTableView.onClickOfRPNLink&code=185326 
> (link from press release)
> 
> Hmm $2.50 ea @ 10k quantity. Tempted to get some samples, just to have the 
> chunky package kicking around  ...
> 
> No curves on the datasheet but at a Vgs threshold of 4V max, and Vgs = 10V 
> to get <2.2 mohm, it would have a viable on resistance run at logic level 
> input. 
> 

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