2SC2631/2SC1953 & 2SK109 equivalents - Page 2 - diyAudio
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Old 13th December 2012, 03:34 PM   #11
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Mitsubishi 2SK109.

J109 doesn't come in A, B, C or D Idss ranks, the K109 did )
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Last edited by jacco vermeulen; 13th December 2012 at 03:37 PM.
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Old 20th May 2014, 05:27 AM   #12
eli1960 is offline eli1960  United States
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Default 2sk109

I have used 2n3819 as a direct replacement for the 2sk109. use 2 and they will work. they are N-channel JFET type. the basing for the transistor (from front) is D,G,S. the IC pin out is 1=D, 2=G and 3=S and then pin 7=D, 6=G and 5=S for the other side. pin 4 has no connection.
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Old 20th May 2014, 06:48 AM   #13
EUVL is offline EUVL  Europe
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Datasheet for 2SK109 :
2SK101-200

The closest replacement in terms of Vds, Yfs and Cis is 2SK209 (in Y, GR & BL grades).
But these are single N-JFETs in SMD and not dual matched.
So you need to match and use an adaptor PCB.
BL grade is in stock at Mouser.

There is also a dual version of 2SK109, namely 2SK2145 which is also available at Mouser.
However this has a Common Source connection so is only useful if your circuit is wired as such (e.g. diff pair with no source degeneration).

If Vds & Cis are not imprtant, I would just use LSK389 (comes in 4 different Idss grades) which is relatively easy to get.


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