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TOKIN SITs- Pairs of THF-51S and 2SK182ES
TOKIN SITs- Pairs of THF-51S and 2SK182ES
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Old 11th October 2018, 06:28 PM   #11
generg is offline generg  Germany
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TOKIN SITs- Pairs of THF-51S and 2SK182ES
You took the fat pin as source and the thin one as Gate and the body as drain?

Did you take similar values for conditions for the N SIT like mine?
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Old 11th October 2018, 06:37 PM   #12
ernesternest is offline ernesternest  Europe
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Quote:
Originally Posted by generg View Post
You took the fat pin as source and the thin one as Gate and the body as drain?

Did you take similar values for conditions for the N SIT like mine?
Yes, Thin=gate, Thick=source, body=drain

My psu is not for 2000mA, but it should be quite linear.....

This is what I did: THF-51s_b.jpg
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Old 11th October 2018, 06:57 PM   #13
generg is offline generg  Germany
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TOKIN SITs- Pairs of THF-51S and 2SK182ES
I have no explanation for your low values......

What did the vendor say they should be?

If you want send me one and I test it in my tracer and we see what happens.
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Old 11th October 2018, 07:11 PM   #14
ernesternest is offline ernesternest  Europe
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Quote:
Originally Posted by generg View Post
I have no explanation for your low values......

What did the vendor say they should be?

If you want send me one and I test it in my tracer and we see what happens.
They are from watanabetomoaki. They have marked 1.5 to 1.7 on their back, which would reflect Vgs at 1000mA.

What I would like to know, if your tests were done with cold Sits or heated Sits. If cold, than mine would really be different.

I think you do have a few from the same source. What was written on the back?
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Old 11th October 2018, 07:29 PM   #15
generg is offline generg  Germany
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TOKIN SITs- Pairs of THF-51S and 2SK182ES
I measured at room temperature.

There was nothing written on the back. But he measured with inverse D and S as you know.
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Old 11th October 2018, 07:58 PM   #16
ernesternest is offline ernesternest  Europe
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Quote:
Originally Posted by generg View Post
I measured at room temperature.

There was nothing written on the back. But he measured with inverse D and S as you know.
Ok, thank you! I did not know how and what he had measured.
So mine seems to be different, if my curve tracer is ok.

You offered measuring one of mine. I'll pm you later.

Gruß

Ernst
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Old 11th October 2018, 08:51 PM   #17
Ben Mah is online now Ben Mah  Canada
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Originally Posted by ernesternest View Post
They are from watanabetomoaki. They have marked 1.5 to 1.7 on their back, which would reflect Vgs at 1000mA.
When I asked about the numbers written on the back of the THF-51Ss that I purchased from watanabetomoaki, he wrote back:

"The written numbers on them means Id (A), at Vds=25V Vgs=-1V aroun 25 degree".

So 1.5 and 1.7 are Id (A) at Vgs=-1V. Also he reversed the Drain and Source for his test at Vgs=-1V.
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Old 11th October 2018, 09:18 PM   #18
ernesternest is offline ernesternest  Europe
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Ah, thank you Ben. Ok, maybe I try to reproduce that.

Cheers
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Old 11th October 2018, 10:04 PM   #19
Ben Mah is online now Ben Mah  Canada
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I purchased four THF-51S. I tested them on a heat sink at Vds=24.0V, Id=1.8A:

Written on Back........Vgs
2.2.......................-3.11V
2.4.......................-3.19V
2.5.......................-4.46V
2.5.......................-3.54V

So I then tested the third one with Vgs=-4.46V the watanabeaoki way but on a heatsink so at a higher temperature than 25C:

Vsd=25V, Vgs(actually g to d)=-1.0V, and I=2.27A which is close to 2.5A written on the bottom.

So with one pair the match was good, but with the supposedly "perfect" pair the match was way off.
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Old 12th October 2018, 04:18 AM   #20
ernesternest is offline ernesternest  Europe
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Thank you Ben for your effort. I just checked it and if done as he did, I get the values he got. So my curve tracer seems to be OK.
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