2SK369 & Spice ?

[CheffDeGaar]

Hello happy taxpayers,

I'm looking for a spice model of the Toshiba 2SK369 high-gm JFet (not 2SK389 !!!). Searched the site and the net, but nothing...

Any help ?

Thanks.

[Praise!]

Hi there,

I am also interested in the 2SK369. I am going to use it in
a MC amp. If you are really interested, pop me a email and
I will try to get it from my supplier. (I run a business selling
audio kits and audio components)

bty, what software are you using? Please do tell me.

James Yung
Praise! Audio

[CheffDeGaar]

Hi James,

I already have a bunch of them, but thanks for your proposal !

BTW, I use MicroCap 7 from Spectrum Soft (http://www.spectrum-soft.com). Easy and quick.

[Netlist]

I think Microcap includes 2SK363.
2SK369 is the low noise version of 2SK363.
Maybe this and the 2SK369 datasheet could help you change model parameters?

Greetings

/Hugo

[CheffDeGaar]

Hi Hugo,

Just checked, but ... no. In fact yes , it should, but in my demo version, none of the 2SK series are available....
And as I'm not an expert, I don't know which parameters in the model are relevant to change one fet into another...

Thanks anyway,

[Netlist]

.MODEL 2SK363_V NJF (VTO=-574.395M BETA=95.173M LAMBDA=1M IS=10F RS=3.11187
+ CGD=36.6561P CGS=60.0451P PB=1.99682 KF=0.001F AF=500M )

.MODEL 2SK363BL NJF (VTO=-398.254M BETA=85.9633M LAMBDA=1M IS=10F CGD=36.6561P
+ CGS=60.0451P PB=1.99682 KF=0.001F AF=500M )

.MODEL 2SK363GR NJF (VTO=-337.112M BETA=80.3593M LAMBDA=1M IS=10F CGD=36.6561P
+ CGS=60.0451P PB=1.99682 KF=0.001F AF=500M )

Neither do I but some smart guys might tell you...

/Hugo

[CheffDeGaar]

Thanks Hugo !!!

Will try to compare with datasheet using a "MicroCap Curve Tracer"

For quick reference, Datasheets can be found here :

2SK369.pdf
2SK363.pdf

2SK363 seems to have a higher transconductance (60mS vs 40 mS typical), but at first glance, apart from the noise, seem to be close.

Thanks again.

[Pedja]

.model 2sk369 NJF(Beta=82.61m Rs=1.556 Rd=1.556 Betatce=-.5 Lambda=414.5u
+ Vto=-.3552 Vtotc=-2.5m Cgd=46.72p M=.3623 Pb=.3905 Fc=.5
+ Cgs=70.51p Isr=86.47p Nr=2 Is=8.647p N=1 Xti=3 Alpha=10u Vk=100
+ Kf=74.85E-18 Af=1)

[CheffDeGaar]

Thanks a lot, Pedja !!

Haven't had the time to test my "software curve tracer" to compare Netlist's models to datasheet specs, but will do soon, now adding the model you kindly provided

Thanks again.

[Praise!]

Originally posted by CheffDeGaar
Hi James,

I already have a bunch of them, but thanks for your proposal !

BTW, I use MicroCap 7 from Spectrum Soft (http://www.spectrum-soft.com). Easy and quick.

Hi Cheff,

Thanks for your response. I didn't mean to sell you some 2SK369 although I can certainly do that. I meant getting the spice model for you for free using my connection to Toshiba. So, do you really want/need it?

The 2SK369 and 2SK363 are identical except 363 is low noise. These are the trade off --- low noise for high gain.

Thanks for telling me about your software. bty, are you using any PCB software? I'm using Easy PC. Cheap but I don't like it; it's more for digital/computer circuits. Will try out Spectrum Soft, thanks.

James Yung
Praise! Audio