new device

[Botte]

Have we talked about these yet?

https://www.mouser.com/datasheet/2/827/DS_UJ3N065080K3S-1530401.pdf

Looks like the gate capacitance is not bad.

 

[twitchie]

Power JFETs in production

 

[JeffYoung]

Power JFETs in production

Oops; cross-posted with twitchie.

 

[Botte]

Thanks

 

[gary s]

It would be interesting to hear what Nelson might have to say about these and if indeed he has some and has done any testing with them.

 

[JeffYoung]

I think he found their linearity underwhelming: Interfet "Japanese Equivalent JFET Types".

 

[Ken Newton]

I think he found their linearity underwhelming: Interfet "Japanese Equivalent JFET Types".

Data sheet figure 6 showing the transfer characteristics depicts some weird looking reverse bending (definitely not linear) curves.

 

[savu]

This is what it looks line with a bit of schade feedback

 

[Zen Mod]

not exactly a bit

 

[Nelson Pass]

I think he found their linearity underwhelming: Interfet "Japanese Equivalent JFET Types".

That was a different part. I ordered up samples of this one and you will
hear about it after some testing....

 

[gary s]

Hi Nelson, have you any comment on the Toshiba TK9J90E or TK20J50D(F) that might be able to be used in the CCS position of a J2 clone or similar amp output topology? Both are readily obtainable and not obsolete (as yet anyway).

 

[Zen Mod]

TK9... , judging by data on Miaouser page , is silly - with 1R3 for Rds-on

TK20... is much better , but nothing to write home about , when looking at old venerable IRFP240

remember that upper one is "just" current follower , sort of ?

 

[gary s]

OK, thanks for your quick comments ZM - I guess while the IRFP240 is still a currently available device, why use something different.

 

[Zen Mod]

use IRFP150

 

[gary s]

Thanks ZM, have 40 of the IRFP150 coming from Arrow at just over $1.20 USD each, a good buy and free Fedex delivery as well.

 

[twitchie]

I got a notice from Big Brother (Google) on my phone that UJ3N0650803KS was 65% off at Mouser.

Less than $5 each if you buy 100

UJ3N065080K3S UnitedSiC | Mouser

Would you be able to use these in the Sissysit or is the threshold gate voltage too far out of the ballpark (-6V to -14V)?

 

[Zen Mod]

toooooooooofar

 

[twitchie]

What if you use Fairchild P device with VGS in the 5.7V range?

 

[Zen Mod]

-6 is still more than -5V7

you need voltage window of at least 250mV , to squeeze opto in

though , maybe you'll get lucky , to tie gates ditto together ?