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United SiC UJ3N065080K3S, Is there any triode behavior?
United SiC UJ3N065080K3S, Is there any triode behavior?
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Old 13th November 2020, 06:06 PM   #1
woofertester is offline woofertester  United States
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Default United SiC UJ3N065080K3S, Is there any triode behavior?

I am opening a thread for the UJ3N065080K3S SiC JFET. Is there an operation area that has triode-like behavior?

This is a thread for curve tracer geeks.

I have attached the results of a curve tracer session of mine on this JFET.

In my experience, devices that have triode-like behavior, this behavior is at high-ish voltage and low-ish current. These same devices have pentode-ish behavior at high-ish current and low-ish voltage. I will post that behavior in the next post.
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Old 13th November 2020, 06:13 PM   #2
woofertester is offline woofertester  United States
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Here is the LU1014D. This family of curves show triode-ish behavior in the highest voltage portion of the plot with the most negative Vgs while the family of curves shows pentode-ish behavior at the highest current portion of the plot that has the most positive Vgs.

In this family of curves, Vgs spans from -1.2v to -0.4v.
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File Type: jpg LU1014D_family_Vgs_1_2_to_0_4.jpg (100.1 KB, 386 views)
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Old 13th November 2020, 06:17 PM   #3
woofertester is offline woofertester  United States
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Here is the LU1014D with Vgs from -2.5V to -1.5V while Vds now goes to 15V and current is limited 100mA. This family of curves is totally triode-ish.
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Old 13th November 2020, 06:20 PM   #4
woofertester is offline woofertester  United States
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My contention is that if a device has triode-ish behavior, you will see it at higher voltage and lower current. The lower current is helpful for limiting self-heating.
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Old 13th November 2020, 06:31 PM   #5
savu is offline savu  Switzerland
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United SiC UJ3N065080K3S, Is there any triode behavior? Send a message via MSN to savu
LU1014D does not seem to be in current production anymore.
Anyone know of anything similar? Except a triode ��
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Old 13th November 2020, 06:54 PM   #6
Nelson Pass is offline Nelson Pass  United States
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United SiC UJ3N065080K3S, Is there any triode behavior?
I have about 8,000 on the shelf. They don't particularly need to be in production.

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Old 13th November 2020, 07:12 PM   #7
EUVL is offline EUVL  Europe
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> I have about 8,000 on the shelf.

Matched ?


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Old 13th November 2020, 08:33 PM   #8
woofertester is offline woofertester  United States
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Quote:
Originally Posted by savu View Post
LU1014D does not seem to be in current production anymore.
Anyone know of anything similar? Except a triode ��
Jims Audio on eBay has genuine LU1014D parts. He did send me 2 duds which he replaced when I alerted him to the problem.

2SK182ES are also available on eBay. I have bought and verified 2 pairs.

2SK60 / 2SJ18 I have bought from eBay and verified as genuine/good.

Russian KP926B I have bought from eBay and verified as genuine/good.

2SJ20 I have bought from eBay and verified as good.

Last edited by woofertester; 13th November 2020 at 08:35 PM.
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Old 13th November 2020, 08:52 PM   #9
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United SiC UJ3N065080K3S, Is there any triode behavior?
Quote:
Originally Posted by Nelson Pass View Post
I have about 8,000 on the shelf. They don't particularly need to be in production.

7.000

you obviously didn't check someone's handbag a year ago, nor shelves recently

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Old 13th November 2020, 09:05 PM   #10
PRR is offline PRR  United States
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United SiC UJ3N065080K3S, Is there any triode behavior?
Quote:
Originally Posted by woofertester View Post
...has triode-like behavior?....
Plot a reasonable load. For speakers, plot say 5A to 40V, which is 100W at 8 Ohms.

Are the device curves more vertical (lower Z) than this load?

While your last example is triodey compared to a speaker, I'd want to check the curves at speaker-like currents.

If you are bench-tracing, it may be useful to use a 40V supply and a 8 Ohm drain resistor, waggle the gate. (This IS how you will use it to drive a speaker, though you have a choice which leg is Common.)
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