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Power JFETs in production
Power JFETs in production
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Old 13th December 2018, 08:58 AM   #1
Kosst Amojan is offline Kosst Amojan  United States
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Default Power JFETs in production

I'm pretty much a nube here, so I'm not exactly sure what makes for a good audio power JFET, but I got bored last night and found that Mouser is stocking and selling UnitedSiC power JFETs in TO-247 packages. They're making these things rated up to 85 amp and 650V. I'm too green to read the data sheet and really understand it, but I wanted to toss it out there for the crowd and see what I can learn.

SiC JFETs | United Silicon Carbide Inc.
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Old 13th December 2018, 01:03 PM   #2
Lingwendil is offline Lingwendil  United States
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P-channel? Hmmmm. Gate capacitance seems pretty high, so it would probably need a beefy driver stage. Expensive too.
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Old 13th December 2018, 02:25 PM   #3
MOER is offline MOER  United States
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Default Power Jfet

No such thing as a POWER JFET!
Jfets are small signal devices, MOSFETs are power devices.
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Old 13th December 2018, 02:47 PM   #4
djmiddelkoop is offline djmiddelkoop  Netherlands
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Quote:
No such thing as a POWER JFET!
Look at the data sheets, it is a power FET, in fact, it looks like a VFET.
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Old 13th December 2018, 02:48 PM   #5
vdi_nenna is offline vdi_nenna  United States
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Power JFETs in production
Quote:
Originally Posted by MOER View Post
No such thing as a POWER JFET!
Jfets are small signal devices, MOSFETs are power devices.
That's not correct. SemiSouth made power Jfets and they are used in the First Watt J2. I used them in a First Watt F6.

SemiSouth in no longer in business, but there are other power jfets out there. Sometimes the descriptions are misleading, so it's best to ask someone who understands the specifications and manufacturing process for power jfets.

SemiSouth SiC Power JFETs

SiC JFETs target high-end audio | Elektor Magazine
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Old 13th December 2018, 02:49 PM   #6
Elvee is offline Elvee  Belgium
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They are actually jFETs, not MOSFETs, and they are N-channel......
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Old 13th December 2018, 02:58 PM   #7
vdi_nenna is offline vdi_nenna  United States
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Power JFETs in production
Reasonable price at mouser. Anyone want to build something?

UJ3N065080K3S UnitedSiC | Mouser

The gate capacitance on a IFRP240 is 1300 typical.
630pF on this jfet.

The IRFP240 and UJ3N065080K3S are a pin to pin match. Doesn't prove anything but...
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Last edited by vdi_nenna; 13th December 2018 at 03:04 PM. Reason: More info.
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Old 13th December 2018, 03:39 PM   #8
JMFahey is offline JMFahey  Argentina
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Very reasonable price for such a beast.

Might order a pair and see what can I do with them.
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Old 13th December 2018, 03:45 PM   #9
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by vdi_nenna View Post
Anyone want to build something?
Always!
Thanks Vdi_nenna for the link of Your jfet interesting discovery
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Old 13th December 2018, 05:13 PM   #10
vdi_nenna is offline vdi_nenna  United States
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Power JFETs in production
Quote:
Originally Posted by Soundhappy View Post
Always!
Thanks Vdi_nenna for the link of Your jfet interesting discovery
I didn't find it. Original poster found it, although this jfet has been talked about in other threads. I have a couple of these jfet spec sheets in my parts folder from 2017.
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