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Old 6th February 2015, 01:59 PM   #1
Dansk is offline Dansk  Denmark
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Default SIC, SIT, V- and JFets

I'm getting a little bit confused about all these terms...
-and it seems I'm not the only one, since for example Farnell sells these, both as mosfets and jfets:

http://www.genesicsemi.com/images/pr...04JT17-247.pdf

Would anyone care to elaborate with regards to the differences between the different types and their advantages compaired to ordinary mosfets, in such a simplistic way, that the tecnically chellenged members inhere (Me) would be able to understand it...?

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Old 6th February 2015, 03:22 PM   #2
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There was a discussion earlier about that genesicsemi. I belive the description is intended to make you believe it's a high power jfet but it's some combination of a regular transistor and a fet. Not recomended. In general SIT devices just have a lot less distortion than mosfets. Nelson has a article you may want to read,

FIRST WATT SIT INTRO
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Old 6th February 2015, 03:45 PM   #3
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Quote:
Originally Posted by Dansk View Post
Farnell sells these, both as mosfets and jfets:

http://www.genesicsemi.com/images/pr...04JT17-247.pdf
It seems that this particular part is an NPN transistor.

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Old 6th February 2015, 03:53 PM   #4
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SiC is a material type (Silicon Carbide). MOSFETs, JFETs, and SITs, could all be made in SiC.

SITs and VFETs are the same thing, tho VFETs could possibly be viewed as a subset of SITs. Both are types of JFETs, but they have a burried gate, which is similar to a vacuum tube's grid, giving them triode-like saturation characteristics
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Old 6th February 2015, 04:29 PM   #5
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I can open one (a VFET) up and we can take a look at it under a microscope tomorrow in my LIVE Lab Hangout:

https://www.youtube.com/c/MikeRothacher

11:00 AM EST

It's just a practice run anyway, so that we'll see how it goes.
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Old 7th February 2015, 12:48 AM   #6
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will try to follow

cheers!
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Old 7th February 2015, 09:22 AM   #7
Dansk is offline Dansk  Denmark
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Quote:
Originally Posted by Michael Rothacher View Post
I can open one (a VFET) up and we can take a look at it under a microscope tomorrow in my LIVE Lab Hangout:

https://www.youtube.com/c/MikeRothacher

11:00 AM EST

It's just a practice run anyway, so that we'll see how it goes.
Wow! That was quite an offer!

- and thanks for the explanation above...
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Old 7th February 2015, 05:06 PM   #8
flg is offline flg  United States
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Well, I tried but, I wasn't getting any audio
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Old 7th February 2015, 05:57 PM   #9
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Thanks. I'm sorry. I had sound issues, internet issues, computer issues.

Well, let's face it, I have issues

I'm going to move stuff to my office and try again at 3:00 PM.

I'll post it later for anyone who can't watch live.
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Old 7th February 2015, 06:14 PM   #10
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Quote:
Originally Posted by Michael Rothacher View Post

I'm going to move stuff to my office and try again at 3:00 PM.

I'll post it later for anyone who can't watch live.
Thanks Mike for your courage
I am happy you have time to share interesting stuff with DiyAudio fans.

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