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Old 20th March 2011, 02:56 AM   #11
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I would tend to think that FETs with the large die areas would be decent for class A or AB amplifiers these days because the junction to case thermal resistance is so low. A 1/2 degree C per Watt is common place these days for even TO-220 packages. The lower that figure, the larger the die area and the easier it is go get heat out of the silicon.

Yeah, you might have to design a decent driver circuit of course. That should be the fun part !

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Old 20th March 2011, 04:08 AM   #12
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Originally Posted by abraxalito View Post
Well if we're really in price-no-object territory, how about this Cree one?

Like those SemiSouth SiC JFETs, this looks like another device that's going to have to run at higher than usual voltages (attached). You could run 'em as source followers operating into an OPT at 600Vdc.

The SiC JFETs looked to be very linear. Not too sure these are so much better than Si MOSFETs operating at more convenient voltages.
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