SPICE model request for JFET: 2SK49 and 2N3820

[eblc1388]

I have quite a few of these in my part drawer and also got their datasheet. However, it would be nice to have their SPICE model too so that I can test out new design in SwcadIII. I've searched on the net but couldn't locate any.

Can anyone helps? Thanks.

A typical jfet model is of the form:

.MODEL 2N3370 NJF(VTO=-0.65 BETA=766.8E-6 BETATCE=-0.5 LAMBDA=9E-3
+ RD=1 RS=1 CGS=2.916E-12 CGD=2.8E-12 PB=0.5 IS=114.5E-15 XTI=3 AF=1
+ FC=0.5 N=1 NR=2 MFG=NSC)

 

[on1aag]

Hi EBLC1388,

Here's my jfet library, the 2N3820 is included,
The 2SK49 is gonna be a japanese problem.

on1aag.

 

[eblc1388]

That will do nicely.

Perhaps someone else have got the 2SK49 model.

Thanks to on1aag.

 

[pc88]

The Yahoo group "LTspice" is a great resource for ltspice help.

 

[jari]

spice model for 2N3820

Can you send that model for me also?

 

[ericgibbs]

Can you send that model for me also?

hi jari,
The 2N3820 model is already in the LTS standard.jft folder as downloaded from Linear Tech.

If you cannot see it, paste this into the standard.jft folder

.model J2N3820 PJF(Beta=1.271m Betatce=-.5 Rd=1 Rs=1 Lambda=40m Vto=-2.5 Vtotc=-2.5m Is=222.4f Isr=2.177p N=1 Nr=2 Xti=3 Alpha=29.8u Vk=400.1 Cgd=13.27p M=.4822 Pb=1 Fc=.5 Cgs=16.58p Kf=916.6E-18 Af=1 mfg=National)

 

[jari]

Model

Thank you. It seems to work in eldo simulation.
I was developing some low noise preamplifier and need to find low noise P-channel
JFET.

hi jari,
The 2N3820 model is already in the LTS standard.jft folder as downloaded from Linear Tech.

If you cannot see it, paste this into the standard.jft folder

.model J2N3820 PJF(Beta=1.271m Betatce=-.5 Rd=1 Rs=1 Lambda=40m Vto=-2.5 Vtotc=-2.5m Is=222.4f Isr=2.177p N=1 Nr=2 Xti=3 Alpha=29.8u Vk=400.1 Cgd=13.27p M=.4822 Pb=1 Fc=.5 Cgs=16.58p Kf=916.6E-18 Af=1 mfg=National)