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Re: 2N3819 JFET spice model

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legg wrote:
> On Sat, 26 Feb 2022 11:14:20 -0800 (PST), jrg lbt <jrglbt09@gmail.com>
> wrote:
> 
>> El jueves, 11 de junio de 1998 a las 2:00:00 UTC-5, Stephane TOSTI escribió:
>>> Jean-Marie Bussat wrote:
>>>>
>>>> Hello,
>>>>
>>>> Does anybody have or can tell me where I can find the spice
>>>> model of a 2N3819 model JFET transistor.
>>>>
>>>> Thanks in advance for your help.
>>>> Regards,
>>>>
>>>> Jean-Marie
>>>>
>>>> --
>>>> P.S. Warning the adress in the from field is wrong, please
>>>> use the one below (or remove __NOSPAM__).
>>>> +---------------------------------------------------------------+
>>>> | Jean-Marie Bussat - Laboratoire d'Annecy-le-vieux de Physique |
>>>> | des Particules - BP 110 - 74941 ANNECY-LE-VIEUX - FRANCE |
>>>> | Email: bus...@lapp.in2p3.fr |
>>>> | Tel: +33 (0)4 50 09 17 65 Fax: +33 (0)4 50 09 89 13 |
>>>> +---------------------------------------------------------------+
>>> Voilà
>>> .model J2N3819 NJF(Beta=1.57m Lambda=4m Vto=-1.954
>>> + Cgd=1.5p M=.3821 Pb=1 Fc=.5 Cgs=1.5p Is=173.3f
>>> + N=1 Xti=3 Kf=37.24E-18 Af=1)
>>> A+ Stef.
>> Ooooh! Thanks a lot !!!
> 
> .model 2N3819 NJF(Beta=1.304m Betatce=-.5 Rd=1 Rs=1
> + Lambda=2.25m Vto=-3 Vtotc=-2.5m Is=33.57f Isr=322.4f
> + N=1 Nr=2 Xti=3 Alpha=311.7u Vk=243.6 Cgd=1.6p M=.3622
> + Pb=1 Fc=.5 Cgs=2.414p Kf=9.882E-18 Af=1 mfg=Vishay)
> 
> from current LTspice distribution.
> 
> 2N3819 was always poorly defined w/r data sheet.
> Many vendors, many wafers, many processes were used.

Wow, that's an amazingly crappy part, even for a JFET.

The Fairchild datasheet shows a 15:1 range of pinchoff voltages, and 
that's from just one vendor.

Using SPICE on a part like that is going to generate a lot of 
reasonable-looking wrong answers (my least-favorite kind).

Cheers

Phil Hobbs


-- 
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

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Re: 2N3819 JFET spice model jrg lbt <jrglbt09@gmail.com> - 2022-02-26 11:14 -0800
  Re: 2N3819 JFET spice model legg <legg@nospam.magma.ca> - 2022-03-01 13:50 -0500
    Re: 2N3819 JFET spice model Andrea Croci <andrea.croci@gmx.de> - 2022-03-03 18:10 +0100
  Re: 2N3819 JFET spice model legg <legg@nospam.magma.ca> - 2022-03-18 11:13 -0400
    Re: 2N3819 JFET spice model Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2022-04-07 10:29 -0400
    Re: 2N3819 JFET spice model Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2022-04-07 11:48 -0400
      Re: 2N3819 JFET spice model dplatt@coop.radagast.org (Dave Platt) - 2022-04-07 11:39 -0700
        Re: 2N3819 JFET spice model Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2022-04-07 16:30 -0400
          Re: 2N3819 JFET spice model "jfeng@my-deja.com" <jf0303222@gmail.com> - 2022-04-07 13:45 -0700
            Re: 2N3819 JFET spice model Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2022-04-11 13:30 -0400
              Re: 2N3819 JFET spice model legg <legg@nospam.magma.ca> - 2022-04-11 16:21 -0400
              Re: 2N3819 JFET spice model "jfeng@my-deja.com" <jf0303222@gmail.com> - 2022-04-11 19:57 -0700

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