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Old 15th January 2013, 05:34 PM   #1
RCruz is offline RCruz  Switzerland
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Default 2SK170BL Vp

After building a rig to measure 2SK170BL Idss and Vp, I am slightly puzzled by the measured results.

The rig consists on a 100 oh resistor in series with the Gate and Source pins (shorted together), where I measre Idss using a 9v bat over the fet.

The Vp rig uses a 1M ohm resistor for Rs and the gate to gnd.

The values I got are:
Idss Vp
6,32 -0,58
6,33 -0,57
6,55 -0,58
7,33 -0,63
7,47 -0,62
7,98 -0,66
8,14 -0,64
8,28 -0,64
9,16 -0,69
10,04 -0,71
10,39 -0,73

Looking at the K170 datasheet, I was convinced that for a 8mA Idss, I would get Vp near -0.45V and not -0.64V as per my measurements.

I am writing this hoping to get some input from other experienced people that might helpme understand this issue.

Regards
Ricardo
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Old 15th January 2013, 05:40 PM   #2
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Ricardo to be sure I will use a bench psu instead the battery.

Cheers
Felipe
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Old 15th January 2013, 07:54 PM   #3
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Yes, but the results are very consistent.

I want to use the actual Vp for the k170 to build a common source jfet amp calculator
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Old 15th January 2013, 08:50 PM   #4
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Quote:
Originally Posted by RCruz View Post
I was convinced that for a 8mA Idss, I would get Vp near -0.45V and not -0.64V as per my measurements.
Regards
Ricardo
Are you sure?
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Old 16th January 2013, 07:17 AM   #5
RCruz is offline RCruz  Switzerland
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Thank you stinius.... I was not looking at the correct graph.

So I can assume the relation between Vp nd Idss is fairly linear.... I will do a regression with my data and ee if I can duplicate that plot.
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Old 16th January 2013, 07:40 AM   #6
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Here it is
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Old 21st January 2013, 05:50 PM   #7
RCruz is offline RCruz  Switzerland
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And finally the calculator.....

Please take it with a grain of salt regarding Gain calculations.

Hoping for good comments.
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Old 21st January 2013, 08:32 PM   #8
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The assumption that you have a genuine Toshiba part, may or may not be valid.
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