Cree rolls out new SiC Power MOSFETs

jackinnj · 27th January 2011, 05:53 PM

in the mailbag from EDN:

Q & A with John Palmour of Cree: The future of silicon carbide power switches - PowerSource | Blog on EDN

Datasheet:
http://www.cree.com/products/pdf/CMF20120D.pdf

Application note:
http://www.cree.com/products/pdf/CPWR-AN08.pdf

ontoaba · 27th January 2011, 10:05 PM

It must be expensive to create mosfet in SiC, and where they will be placed?
IGBT has already low enough drop voltages for 1KV and more with less than 2V Vce drop. In low voltage, Hexfets are cheapest and rugged technology also very low Rds on and also fast, 5MHz reached for 100W RF classE amplifier with IRF540 and 50MHz 2W with IRF510. In audio, Lateral are the most linear and no thermal drift. For low power, there are many other like SOI devices.

Nelson Pass · 28th January 2011, 12:36 AM

Digikey will sell them to you for about $97

jackinnj · 28th January 2011, 02:20 AM

Was it Mark Shepherd who postulated that every time the cumulative volume of a product doubles the price falls by half.

abraxalito · 28th January 2011, 02:34 AM

Looks to me that the Cree guy is engaging in a little doublethink in avoiding a direct answer to a question on the pricing curve. MOSFETs benefitted from being multiple sourced if my memory serves correctly, so the market ensured their competitive prices.

effebi · 28th January 2011, 06:22 AM

Quote:

Originally Posted by Nelson Pass

Digikey will sell them to you for about $97

With the due respect, I would say it was more or less the same for the first HexFets some decades ago (I will have to double check that).
What I still can't get is how you can do the magic to make this switching intended devices into a beautiful linear circuit.
effebi

ontoaba · 28th January 2011, 07:13 AM

Yes, It will not competitive in price.
If they really will sell it for $10 when they produce 10x of recently produced. May that is somewhat competitive to IGBT that around $2-$4 at the same rating.
I don't know how they implant the dopant to that thing. SiC is a solid rock, not a crisp wafer anyway.
If they sell it for $10, still I like to use IGBT for its 1/4 price, because I don't like to switch 1KV at very high freq, many other things there.

Zen Mod · 28th January 2011, 08:22 AM

Quote:

Originally Posted by effebi

With the due respect, I would say it was more or less the same for the first HexFets some decades ago (I will have to double check that).
What I still can't get is how you can do the magic to make this switching intended devices into a beautiful linear circuit.
effebi

NP already does that in his commercial products ;

not mentioning fact that most of HexFets are intended for switching circs

buzzforb · 28th January 2011, 09:49 AM

Not very original, but F3 no cascode and more power?

27th January 2011, 05:53 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Cree rolls out new SiC Power MOSFETs in the mailbag from EDN: Q & A with John Palmour of Cree: The future of silicon carbide power switches - PowerSource \| Blog on EDN Datasheet: http://www.cree.com/products/pdf/CMF20120D.pdf Application note: http://www.cree.com/products/pdf/CPWR-AN08.pdf

28th January 2011, 02:34 AM	#5
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Looks to me that the Cree guy is engaging in a little doublethink in avoiding a direct answer to a question on the pricing curve. MOSFETs benefitted from being multiple sourced if my memory serves correctly, so the market ensured their competitive prices. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

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27th January 2011, 10:05 PM	#2
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	It must be expensive to create mosfet in SiC, and where they will be placed? IGBT has already low enough drop voltages for 1KV and more with less than 2V Vce drop. In low voltage, Hexfets are cheapest and rugged technology also very low Rds on and also fast, 5MHz reached for 100W RF classE amplifier with IRF540 and 50MHz 2W with IRF510. In audio, Lateral are the most linear and no thermal drift. For low power, there are many other like SOI devices.

28th January 2011, 12:36 AM	#3
Nelson Pass The one and only Join Date: Mar 2001	Digikey will sell them to you for about $97

28th January 2011, 02:20 AM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Was it Mark Shepherd who postulated that every time the cumulative volume of a product doubles the price falls by half.

28th January 2011, 07:13 AM	#7
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	Yes, It will not competitive in price. If they really will sell it for $10 when they produce 10x of recently produced. May that is somewhat competitive to IGBT that around $2-$4 at the same rating. I don't know how they implant the dopant to that thing. SiC is a solid rock, not a crisp wafer anyway. If they sell it for $10, still I like to use IGBT for its 1/4 price, because I don't like to switch 1KV at very high freq, many other things there.

28th January 2011, 09:49 AM	#9
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Not very original, but F3 no cascode and more power?

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