JFET and MOSFET SPICE models

[Osvaldo de Banfield]

Accordingly to this stuff, and manufacturer´s data sheet, I have made my own .models for some common JFET´s And MOSFET´s for Spice soft. I want to share them. In few time I´do for other field effect transistors. Those has been tested in a simulation of a reality working circuit, my OSF. Enjoy.

.model 2SK117Y NJF(beta=6.323m vto=-0.547 is=-1n cgd= 8.0445p cgs=4.9555p lambda=65.89 mfg=TOSHIBA)
.model 2SK117GR NJF(beta=13.7m vto=-0.547 is=-1n cgd= 8.0445p cgs=4.9555p lambda=30.41 mfg=TOSHIBA)
.model 2SK117BL NJF(beta=30.55m vto=-0.547 is=-1n cgd= 8.0445p cgs=4.9555p lambda=13.64 mfg=TOSHIBA)

.model 2SK170GR NJF(beta=13.7m vto=-0.547 is=-1n cgd= 16.089p cgs=13.91p lambda=20m mfg=TOSHIBA)
.model 2SK170BL NJF(beta=28.283m vto=-0.547 is=-1n cgd= 1.119p cgs=11.881p lambda=9.72m mfg=TOSHIBA)
.model 2SK170V NJF(beta=47.14m vto=-0.547 is=-1n cgd= 1.119p cgs=11.881p lambda=5.833m mfg=TOSHIBA)

 

[datjblvietnam]

This is interesting .Thanks a lot !

 

[Osvaldo de Banfield]

More models

Here are more model generated of my own:

.model 2SJ103Y PJF(beta=1.053m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=34.8 mfg=TOSHIBA)
.model 2SJ103GR PJF(beta=2.283m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=16 mfg=TOSHIBA)
.model 2SJ103BL PJF(beta=5.092m vto=-1.342 is=1n cgd=8.0445p cgs=4.9555p lambda=7.2 mfg=TOSHIBA)

.model 2SK246Y NJF(beta=13.7m vto=-0.648 is=-1n cgd=16.089p cgs=13.91p lambda=35.14m mfg=TOSHIBA)
.model 2SK246GR NJF(beta=28.283m vto=-0.648 is=-1n cgd=1.119p cgs=11.881p lambda=16.22m mfg=TOSHIBA)
.model 2SK246BL NJF(beta=47.14m vto=-0.648 is=-1n cgd=1.119p cgs=11.881p lambda=7.274m mfg=TOSHIBA)

.model 2SK389GR NJF(beta=13.7m vto=-0.547 is=-1n cgd=14.74p cgs=10.25p lambda=6m mfg=TOSHIBA)
.model 2SK389BL NJF(beta=28.283m vto=-0.547 is=-1n cgd=14.74p cgs=10.25p lambda=2.9m mfg=TOSHIBA)
.model 2SK389V NJF(beta=47.14m vto=-0.547 is=-1n cgd=14.74p cgs=10.25p lambda=1.74m mfg=TOSHIBA)

 

[kevinkr]

2SJ103 model corrected per Osvaldo's request.

 

[Osvaldo de Banfield]

2SJ103 model corrected per Osvaldo's request.

Many thanks, Kevin.

Apologize by the inconvenience.

Here I add one more:

.MODEL 2SK2692 NMOS(mfg=TOSHIBA LEVEL=3 L=1n W=5.952 KP=62.5u VTO=1.265 CGSO=120p CGDO=20p)

Good luck!

 

[tvrgeek]

Wooo Hooo! Much thanks

 

[Osvaldo de Banfield]

Wooo Hooo! Much thanks

Ok, boy. I did this work of my own, because I find that some models are by there, really didn't work properly. I did a all-FEt audio amplifier that worked fine in the proto-board, but when after I simulate it, there was too error from real circuit to the simulations. Following the models I did from the above mentioned stuff, the simulation was pretty close to the real circuit.

For example: The real circuit was giving near 10Vpp at 440Hz immediately after clipping with 12V power supply, and the first models I found and use, clip with 8.3V or so. With my self-made models, clipping was very near 10V, circa 9.8V. So model appears to be more accurate.

And none of them make difference between manufacturer's IDSS range, mine does.

Enjoy.

 

[EUVL]

The Cgd values for differtent grades of 2SK170 & 2SK246 are inconsistent, and I believe incorrect.


Patrick

 

[Jay]

For example: The real circuit was giving near 10Vpp at 440Hz immediately after clipping with 12V power supply, and the first models I found and use, clip with 8.3V or so. With my self-made models, clipping was very near 10V, circa 9.8V. So model appears to be more accurate..

Hopefully your device is original from Toshiba. Even so, I think the spread of the typical performance in JFET is quite large. Later I will compare yours with the ones from Fred Dieckmann that I found accurate. I'm not comfortable with low decimal places, incomplete parameters etc.

 

[Osvaldo de Banfield]

The Cgd values for differtent grades of 2SK170 & 2SK246 are inconsistent, and I believe incorrect.


Patrick

Ok, yes, may be a error in my calculus, but in this case try your own values, and compare with mines.

 

[JoelM81]

How about 2SK1109 and 2SK596? :/ Can these be derived from the datasheet, or only from actual testing of the part?

 

[VictorQ]

Hello!

These JFET models seem to be broken (at least using them LTSpice)! In particular I notice that the parameter "is" is negative, which makes them behave in very weird ways (over-unity gain in common drain configuration, low and resistive input impedance ~10kOhm). Had me scratching my head for a bit there!

Looking at some other JFET models the "is" parameter is never negative and is also quite a bit lower than 1n. In any case these models are highly suspect. I can only conclude the OP is trying to mess with us.


DO NOT USE THESE MODELS