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Old 28th April 2012, 12:03 PM   #1
tomst is offline tomst  United Kingdom
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Default lsk170c JFET or equivalent

Hi
Any one know were i could get some LSK170c or equivalent JFET. I have searched the internet and cannot find anything.
the basics i need are N channel 1V to 2V VGS and 10mA to 20mA IDSS.
the Jfets are going in variable (for experimental purposes) CCS device to bias an OPamp in to class A
in this case would a Jfet with a negative VGS work?
Thanks
Tom
I'm in the UK
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Old 28th April 2012, 11:32 PM   #2
satoru is offline satoru  United States
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LSK170 is a second source of 2SK170 (made by Toshiba but discontinued). For 10 ~ 20 mA, you need V rank, which is still available here and there. If this is for experiments, why don't you design a simple BJT based CCS, where you can have more freedom on the current setting?

Have fun!
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Old 28th April 2012, 11:55 PM   #3
qusp is offline qusp  Australia
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you cant parallel a few lower IDSS parts? 2sk170BL are still pretty widely available including in the for sale and group buy section here in the forum, its only the P channel thats really hard to find legit. you can also find some 2sk369V around the place
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Old 29th April 2012, 02:49 AM   #4
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BF862 -- surface mount -- from NXP --
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Old 29th April 2012, 01:09 PM   #5
tomst is offline tomst  United Kingdom
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Thanks for the replays.
For me the BF862 is easy to get hold of.
If I was to use the BF862 what would the best way to mount it on a prototype strip board?
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Old 29th April 2012, 01:14 PM   #6
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I bought 2SK170BL from E-Bay with no issues.

4 X MATCHED 2SK170 2SK170BL 2SJ74 2SJ74BL FET! | eBay

http://www.ebay.co.uk/itm/4-X-MATCHE...item230dd5addb
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Old 29th April 2012, 01:29 PM   #7
AndrewT is offline AndrewT  Scotland
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LSK170, matched pairs in the UK.
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Old 30th April 2012, 08:39 AM   #8
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Quote:
Originally Posted by jackinnj View Post
BF862 -- surface mount -- from NXP --
The NXP Data Sheet doesn't say anything about noise performance in the audio range - only at 100 KHz. Is there a manufacturer who DOES spec this parameter? Or, are there at least some sample measurements that verify low noise at lower frequencies?

Dale
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Old 30th April 2012, 10:34 AM   #9
gk7 is offline gk7
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Its the 2SJ74 which becomes hard to get. The 2SK170 is still available from major
distributors:
2SK170BLF Toshiba JFET

LSK170 you can get here:
Micross Components | Products
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Old 30th April 2012, 10:53 AM   #10
AndrewT is offline AndrewT  Scotland
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Can anybody find out how many 2sk170 were produced in that last Toshiba production run?
Are we in 10^6 or 10^7 or 10^8 region?
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