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J
jrg lbt
Guest
El jueves, 11 de junio de 1998 a las 2:00:00 UTC-5, Stephane TOSTI escribió:
Ooooh! Thanks a lot !!!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 |
+---------------------------------------------------------------+
VoilÃ
.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.
L
legg
Guest
On Sat, 26 Feb 2022 11:14:20 -0800 (PST), jrg lbt <jrglbt09@gmail.com>
wrote:
from 1998 . . . .
RL
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 !!!
from 1998 . . . .
RL
A
Andrea Croci
Guest
On 01.03.22 19:50, legg wrote:
It\'s never too late to thank your fellow engineers.
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:
Ooooh! Thanks a lot !!!
from 1998 . . . .
RL
It\'s never too late to thank your fellow engineers.
L
legg
Guest
On Sat, 26 Feb 2022 11:14:20 -0800 (PST), jrg lbt <jrglbt09@gmail.com>
wrote:
..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.
RL
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.
RL
P
Phil Hobbs
Guest
legg wrote:
Yeah, using SPICE on a part with a 3:1 range of pinchoff voltage is
going to lead to 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
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 |
+---------------------------------------------------------------+
VoilÃ
.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.
Yeah, using SPICE on a part with a 3:1 range of pinchoff voltage is
going to lead to 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
P
Phil Hobbs
Guest
legg wrote:
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
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 |
+---------------------------------------------------------------+
VoilÃ
.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
D
Dave Platt
Guest
In article <8ea114da-661e-405f-b96a-3a371d063c76@electrooptical.net>,
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
I\'ve always thought of 2N3819 as the JFET analog of the 2N3055 BJT.
It\'s a convenient part number into which you can reasonably throw a
whole lot of different JFET products. Test what you fab, and if they
don\'t meet tighter specs for a targeted part number, just call them
2N3819.
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
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.
I\'ve always thought of 2N3819 as the JFET analog of the 2N3055 BJT.
It\'s a convenient part number into which you can reasonably throw a
whole lot of different JFET products. Test what you fab, and if they
don\'t meet tighter specs for a targeted part number, just call them
2N3819.
P
Phil Hobbs
Guest
Dave Platt wrote:
They must have made them in saucepans. Actual _good_ JFETs, such as the
CPH3910, have much much tighter specs (and much lower noise).
Cheers
Phil Hobbs
\"40,000 of them in stock\"
--
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
In article <8ea114da-661e-405f-b96a-3a371d063c76@electrooptical.net>,
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:
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.
I\'ve always thought of 2N3819 as the JFET analog of the 2N3055 BJT.
It\'s a convenient part number into which you can reasonably throw a
whole lot of different JFET products. Test what you fab, and if they
don\'t meet tighter specs for a targeted part number, just call them
2N3819.
They must have made them in saucepans. Actual _good_ JFETs, such as the
CPH3910, have much much tighter specs (and much lower noise).
Cheers
Phil Hobbs
\"40,000 of them in stock\"
--
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
J
jfeng@my-deja.com
Guest
On Thursday, April 7, 2022 at 1:30:18 PM UTC-7, Phil Hobbs wrote:
I always assumed it reflected the manufacturing processes available at the time. By that time, the planar diffused process was pretty common, and it was much better controlled than using the grown-junction or alloy-junction processes. Good engineers learned how to design circuits that could tolerate the variations in those processes and the variations produced by varying operating temperatures and voltages. Ion implantation produced much tighter ranges, but it was still not a common manufacturing process in the mid 1970s.They must have made them in saucepans. Actual _good_ JFETs, such as the
CPH3910, have much much tighter specs (and much lower noise).
P
Phil Hobbs
Guest
jfeng@my-deja.com wrote:
IIRC the usual planar JFET of that era has a Vp range of around 3:1.
This piece of crap\'s range is 15:1.
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
On Thursday, April 7, 2022 at 1:30:18 PM UTC-7, Phil Hobbs wrote:
They must have made them in saucepans. Actual _good_ JFETs, such as the
CPH3910, have much much tighter specs (and much lower noise).
I always assumed it reflected the manufacturing processes available at the time. By that time, the planar diffused process was pretty common, and it was much better controlled than using the grown-junction or alloy-junction processes. Good engineers learned how to design circuits that could tolerate the variations in those processes and the variations produced by varying operating temperatures and voltages. Ion implantation produced much tighter ranges, but it was still not a common manufacturing process in the mid 1970s.
IIRC the usual planar JFET of that era has a Vp range of around 3:1.
This piece of crap\'s range is 15:1.
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
L
legg
Guest
On Mon, 11 Apr 2022 13:30:48 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
I think the 3:1 range for one part number was achieved
by binning a series of numbers (typically 4 or more) from
the same mfring process batch.
RL
<pcdhSpamMeSenseless@electrooptical.net> wrote:
jfeng@my-deja.com wrote:
On Thursday, April 7, 2022 at 1:30:18 PM UTC-7, Phil Hobbs wrote:
They must have made them in saucepans. Actual _good_ JFETs, such as the
CPH3910, have much much tighter specs (and much lower noise).
I always assumed it reflected the manufacturing processes available at the time. By that time, the planar diffused process was pretty common, and it was much better controlled than using the grown-junction or alloy-junction processes. Good engineers learned how to design circuits that could tolerate the variations in those processes and the variations produced by varying operating temperatures and voltages. Ion implantation produced much tighter ranges, but it was still not a common manufacturing process in the mid 1970s.
IIRC the usual planar JFET of that era has a Vp range of around 3:1.
This piece of crap\'s range is 15:1.
Cheers
Phil Hobbs
I think the 3:1 range for one part number was achieved
by binning a series of numbers (typically 4 or more) from
the same mfring process batch.
RL
J
jfeng@my-deja.com
Guest
On Monday, April 11, 2022 at 10:30:51 AM UTC-7, Phil Hobbs wrote:
I remember the standard bipolar transistor hfe spec had a 3:1 range. They narrowed by testing and selecting parts, so there were lots of \"families\" with consecutive numbers and similar specs except for the buckets for the selected parameter (hfe, BVceo, fT, etc).
IIRC the usual planar JFET of that era has a Vp range of around 3:1.
This piece of crap\'s range is 15:1.
My recollection is that there were not very many other commercial JFETs for comparison. And the specs for the MOSFETs were even more poorly controlled because they did not understand the manufacturing hygiene required to control the surface states.
I remember the standard bipolar transistor hfe spec had a 3:1 range. They narrowed by testing and selecting parts, so there were lots of \"families\" with consecutive numbers and similar specs except for the buckets for the selected parameter (hfe, BVceo, fT, etc).