We have used MOSFET's with TO-220 and TO-247 packages for years.  Now we want to go to surface mount and similar MOSFET's are available in D2PAK  (TO-263) packages.  For instance a Siliconix SUB85N06-05 is rated at 85 amps continuous and 250 watts dissipation.

Is anyone out there designing high power and current with the D2PAK?  How in the world am I going to get 250 watts to pass through the PCB and into a heatsink?  Any tips on getting that much current out of the source lead would also be appreciated.

We have the Algor FEA software and will try to model the thermal transfer.   Does anyone know the exact thickness of 2 oz. copper?   I have ...07mm written down but I am not sure it is correct.

What is the thickest copper that board houses normally use?

Our current design will use 28 of these MOSFET's.

Thanks
Heart
Heart Transverter S.A
Costa Rica
www.transverter.net
 
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