New Semisouth SiC "JFET Lite" - diyAudio
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Old 20th April 2012, 05:33 AM   #1
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Default New Semisouth SiC "JFET Lite"

Semisouth just announced a new depletion mode SiC JFET, the SJDP120R340. The voltage rating is 1200V like the other players, but with an RDSon of 340 mohm. This of course means a much smaller die area than previous products, which already have small die and a consequently somewhat challenged junction-to-case thermal resistance.
Having said that. this one might be just the thing for some maniacal line level app - get your thinking caps on! The price is supposedly $7 in 1k quantities, which should make it reasonably affordable even in small lots. It's so new that the data sheet wasn't up last time I looked (recently) at the Semisouth web site.

Last edited by wrenchone; 20th April 2012 at 08:13 AM.
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Old 20th April 2012, 05:40 AM   #2
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This one? http://www.telion.ch/data/cms/IE/Ene...JDP120R340.pdf
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Old 20th April 2012, 06:47 AM   #3
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That's the one - the data sheet wasn't up when I was looking around a couple of days ago - still isn't, to a certain extent, as there are almost as many TBDs in the spec sheet as there are real numbers. I guess I won't be holding my breath until I see product...
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Old 20th April 2012, 07:33 AM   #4
qusp is offline qusp  Australia
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this looks like the one for the headphone amp i've been wanting to make with these puppies
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Old 21st April 2012, 12:00 AM   #5
Bigun is offline Bigun  Canada
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we need to see the capacitance curves - some of these SiC JFETs look fine until you dive into the capacitance curves at the lower voltages you might want to use for a headphone amp.
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Old 21st April 2012, 12:10 AM   #6
qusp is offline qusp  Australia
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who said anything about running low voltage? but I take your point.

the iron I would probably use is a potted transformer I bought some time ago for a dac build but went a different way and it has 2 x 25-0-25vac and 2 x 45-0-45vac secondaries for a total of 140va actually it might have been higher, thats the right voltages but I cant remember what I specced the current at

Last edited by qusp; 21st April 2012 at 12:14 AM.
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Old 21st April 2012, 12:14 AM   #7
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Quote:
Originally Posted by qusp View Post
this looks like the one for the headphone amp i've been wanting to make with these puppies
Here is what I use for a headphone amp:


http://wavebourn.com/forum/download.php?id=682&f=7
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Old 21st April 2012, 12:16 AM   #8
qusp is offline qusp  Australia
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nice one, yeah i've been eyeing the r100A off too. what are you using for the VAS? more semisouth, or am I looking at it on the left?
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Old 21st April 2012, 12:28 AM   #9
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Quote:
Originally Posted by qusp View Post
nice one, yeah i've been eyeing the r100A off too. what are you using for the VAS? more semisouth, or am I looking at it on the left?
6Ж9П and 6П41С for "VAS" and half of output stage. The rest is secret (commercial project)
What you se there to the right of it, are transistors for voltage stabilizers and filament Shottky rectifier.

Edit: I never use "VAS". The whole amp amplifies power.

One more picture: http://wavebourn.com/forum/download.php?id=681&f=7
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Last edited by Wavebourn; 21st April 2012 at 12:37 AM.
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Old 21st April 2012, 03:49 AM   #10
flg is offline flg  United States
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I would like to comment but I just couldn't figure out anything worthwhile to say???
TBD
TBD
TBD
Oh, codo's wrenchone for finding a few interesting parameters but RdsON??? Are you kidding? This is a classA thread? I have a little bias there. If it isn't 10mohms or less I don't care. The last FET I played with a few weeks ago was an IRF6894 and whatever on top, but, I believe it's rated at .9mohms. I'm not braggin, or pushin this part but, RdsON? I guess if yor building something like an F5 Turbo RdsON is important...
O.K. enough of that, sorry wrenchone but, Semisouths introduction is a total flop to eveyone possibly interested IMHO
Thanks for letting us know about this though wrenchone, it may prove to be another usefull part???
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Last edited by flg; 21st April 2012 at 03:58 AM. Reason: I'm an idiot sometimes?
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