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Replacement For Toshiba 2SK170/2SJ74
Replacement For Toshiba 2SK170/2SJ74
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Old 5th August 2018, 08:08 PM   #211
EUVL is offline EUVL  Europe
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IV curves :
xen-audio

Why match :
xen-audio


Patrick
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Old 5th August 2018, 08:30 PM   #212
MEPER is offline MEPER  Denmark
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When Idss is measured at what Vds should that normally be done to get a "standardized" value for Idss? …..a Vds just before break down to get the max Ids?
Some use 9V.....but that is because they use a 9V battery for the measurement?
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Old 5th August 2018, 11:00 PM   #213
Mark Johnson is offline Mark Johnson  United States
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Replacement For Toshiba 2SK170/2SJ74
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Originally Posted by MEPER View Post
When Idss is measured at what Vds should that normally be done to get a "standardized" value for Idss? ..a Vds just before break down to get the max Ids?
Some use 9V.....but that is because they use a 9V battery for the measurement?
It's completely your choice, do it however you please.

Me, I like to get far away from the knee and the linear region. So I prefer to measure well above ~ 4 x |Vpinchoff| which ensures I'm well away from the knee.

For the 2SJ74 in Toshiba's datasheet, that's something well above ~ 3.6 volts. 9 volts is certainly well above 3.6 volts. Naturally, other designers may interpret the data differently, or arrive at a different final preference.

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Old 6th August 2018, 06:41 AM   #214
MEPER is offline MEPER  Denmark
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Ok....so 9V Vds could be a real operation condition in an amplifier.
Would the curves had looked "nicer" if there was same distance between them so a change in Vgs gave same change in Ids?
I am still at a "FET learning curve" :-)
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