Does someone knows what mosfet is this?

SunRa · 16th February 2008, 02:52 PM

I have spoted what looks like a high power mosfet in this 6moons preview of Thorens .

There is a picture of the device almost on the bottom of the page, where it shows the number of components in the signal path. The tubes are named but not the output mosfet. Could it be a custom made one? Highly improbable though...

Thank you!

SunRa · 17th February 2008, 02:23 PM

No one, not a hint?

They look like high current, high voltage probably huge capacitance also, but should do great in current buffer stages, with a hefty driver stage...

jneutron · 20th February 2008, 03:49 PM

Quote:

Originally posted by SunRa
I have spoted what looks like a high power mosfet in this 6moons preview of Thorens .

There is a picture of the device almost on the bottom of the page, where it shows the number of components in the signal path. The tubes are named but not the output mosfet. Could it be a custom made one? Highly improbable though...

Thank you!

It looks like a SOT-227B package, like this:

http://www.ixyspower.com/store/Family.aspx?i=5

But I'm not sure that package is 300 ampere capable.
Ixys has 700 watt dissipation.

Maybe the isoplus 227 package:

http://www.ixyspower.com/store/Family.aspx?i=2

Cheers, John

poynton · 20th February 2008, 04:32 PM

Quote:

Originally posted by jneutron

It looks like a SOT-227B package, like this:

http://www.ixyspower.com/store/Family.aspx?i=5

But I'm not sure that package is 300 ampere capable.
Ixys has 700 watt dissipation.

Maybe the isoplus 227 package:

http://www.ixyspower.com/store/Family.aspx?i=2

Cheers, John

Looking at the image in the review, I would say the isoplus 227.
But the specs are nowhere close !!!!!

Maybe the picture is a 'red herring' to throw people off the scent !!

Try this :- http://jp.digikey.com/scripts/dksearch/dksus.dll

Andy

Thorens image

SunRa · 16th March 2008, 07:06 PM

Thank you all for response and sorry for my late reply.

The review is updated, it seems that the devices are having a transconductance of 40A/V and it seems they are used in the GamuT amps as well...

SunRa · 16th March 2008, 07:13 PM

Here is a link to a GamuT amplifier using the same device.

SunRa · 16th March 2008, 07:32 PM

This one from Microsemi maybe?

SunRa · 16th March 2008, 08:22 PM

Forget my previous post, the current is way to small.

After searching on digikey it came obvious that the only parts that roughly match are the ones from IXYS as are the only ones with a current of 280-340Amps. Any thought on this?

SunRa · 18th March 2008, 08:57 PM

It would be great if someone would know what part is used in those amplifiers.

The ones I've identified with similar ratings have something in common.. the very high input capacitance. This could put troubles in any design...

KSTR · 20th March 2008, 07:28 PM

While it surely isn't the module used by Thorens, this Micro-Semi module looks promising for DIY-approaches: APL501J, which has properties better suited to linear operation than the APT models which are optimized for hard switching duties. According to Micro-Semi information it can in fact withstand its rated 500W Pd (if cooled appropriately) at lower Vds (<100V) which would happen to be the case in a circlotron. Module price is some 130US$.

From the conservative rating for the module used in the Thorens I suspect it is a normal switch-mode device which is prone to hot-spotting failures and must be heavily derated for linear mode operation.

BTW, I like that design and the ideas behind the TEM3200 pretty much.

- Klaus
EDIT: Spelling (as usual)

16th February 2008, 02:52 PM	#1
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	Does someone knows what mosfet is this? I have spoted what looks like a high power mosfet in this 6moons preview of Thorens . There is a picture of the device almost on the bottom of the page, where it shows the number of components in the signal path. The tubes are named but not the output mosfet. Could it be a custom made one? Highly improbable though... Thank you!

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17th February 2008, 02:23 PM	#2
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	No one, not a hint? They look like high current, high voltage probably huge capacitance also, but should do great in current buffer stages, with a hefty driver stage...

16th March 2008, 07:06 PM	#5
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	Thank you all for response and sorry for my late reply. The review is updated, it seems that the devices are having a transconductance of 40A/V and it seems they are used in the GamuT amps as well...

16th March 2008, 07:13 PM	#6
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	Here is a link to a GamuT amplifier using the same device.

16th March 2008, 07:32 PM	#7
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	This one from Microsemi maybe?

16th March 2008, 08:22 PM	#8
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	Forget my previous post, the current is way to small. After searching on digikey it came obvious that the only parts that roughly match are the ones from IXYS as are the only ones with a current of 280-340Amps. Any thought on this?

18th March 2008, 08:57 PM	#9
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	It would be great if someone would know what part is used in those amplifiers. The ones I've identified with similar ratings have something in common.. the very high input capacitance. This could put troubles in any design...

20th March 2008, 07:28 PM	#10
KSTR diyAudio Member Join Date: Jul 2007 Location: Central Berlin, Germany	While it surely isn't the module used by Thorens, this Micro-Semi module looks promising for DIY-approaches: APL501J, which has properties better suited to linear operation than the APT models which are optimized for hard switching duties. According to Micro-Semi information it can in fact withstand its rated 500W Pd (if cooled appropriately) at lower Vds (<100V) which would happen to be the case in a circlotron. Module price is some 130US$. From the conservative rating for the module used in the Thorens I suspect it is a normal switch-mode device which is prone to hot-spotting failures and must be heavily derated for linear mode operation. BTW, I like that design and the ideas behind the TEM3200 pretty much. - Klaus EDIT: Spelling (as usual)