J
John Larkin
Guest
There don\'t seem to be any. Pity.
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J
Joerg
Guest
On 11/21/22 12:20 PM, John Larkin wrote:
At least there are p-channel JFET such as the MMBFJ175:
https://www.onsemi.com/pdf/datasheet/j175-d.pdf
Central Semi also makes it. Here is a modern one:
https://www.linearsystems.com/lsdata/datasheets/174DFNSeriesDSRevA4
--
Regards, Joerg
http://www.analogconsultants.com/
There don\'t seem to be any. Pity.
At least there are p-channel JFET such as the MMBFJ175:
https://www.onsemi.com/pdf/datasheet/j175-d.pdf
Central Semi also makes it. Here is a modern one:
https://www.linearsystems.com/lsdata/datasheets/174DFNSeriesDSRevA4
--
Regards, Joerg
http://www.analogconsultants.com/
P
Phil Hobbs
Guest
John Larkin wrote:
They\'re equivalent to NFETs for two-terminal use, of course. I\'m not
instantly thinking of a common three-terminal use for one, but I\'m
probably just dull this afternoon.
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
There don\'t seem to be any. Pity.
They\'re equivalent to NFETs for two-terminal use, of course. I\'m not
instantly thinking of a common three-terminal use for one, but I\'m
probably just dull this afternoon.
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
J
Joerg
Guest
On 11/21/22 12:36 PM, Joerg wrote:
P.S.: There was the FJ3P02100L, a bigger p-channel depletion mode MOSFET
from Panasonic but AFAIK it has been discontinued.
https://docs.rs-online.com/1d79/0900766b8124e5e4.pdf
I guess there just isn\'t a sufficient market for that kind of FET.
--
Regards, Joerg
http://www.analogconsultants.com/
On 11/21/22 12:20 PM, John Larkin wrote:
There don\'t seem to be any. Pity.
At least there are p-channel JFET such as the MMBFJ175:
https://www.onsemi.com/pdf/datasheet/j175-d.pdf
Central Semi also makes it. Here is a modern one:
https://www.linearsystems.com/lsdata/datasheets/174DFNSeriesDSRevA4
P.S.: There was the FJ3P02100L, a bigger p-channel depletion mode MOSFET
from Panasonic but AFAIK it has been discontinued.
https://docs.rs-online.com/1d79/0900766b8124e5e4.pdf
I guess there just isn\'t a sufficient market for that kind of FET.
--
Regards, Joerg
http://www.analogconsultants.com/
U
Uwe Bonnes
Guest
John Larkin <jlarkin@highlandsnipmetechnology.com> wrote:
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
There don\'t seem to be any. Pity.
Are they physical possible?
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
J
Joerg
Guest
On 11/21/22 12:45 PM, Joerg wrote:
Whoops, wrong FET. Can\'t find it anymore.
--
Regards, Joerg
http://www.analogconsultants.com/
On 11/21/22 12:36 PM, Joerg wrote:
On 11/21/22 12:20 PM, John Larkin wrote:
There don\'t seem to be any. Pity.
At least there are p-channel JFET such as the MMBFJ175:
https://www.onsemi.com/pdf/datasheet/j175-d.pdf
Central Semi also makes it. Here is a modern one:
https://www.linearsystems.com/lsdata/datasheets/174DFNSeriesDSRevA4
P.S.: There was the FJ3P02100L, a bigger p-channel depletion mode MOSFET
from Panasonic but AFAIK it has been discontinued.
https://docs.rs-online.com/1d79/0900766b8124e5e4.pdf
Whoops, wrong FET. Can\'t find it anymore.
I guess there just isn\'t a sufficient market for that kind of FET.
--
Regards, Joerg
http://www.analogconsultants.com/
J
Joerg
Guest
On 11/21/22 1:56 PM, Uwe Bonnes wrote:
It seems so:
https://ieeexplore.ieee.org/document/1486206
Didn\'t NMOS logic use p-channel depletion mode?
--
Regards, Joerg
http://www.analogconsultants.com/
John Larkin <jlarkin@highlandsnipmetechnology.com> wrote:
There don\'t seem to be any. Pity.
Are they physical possible?
It seems so:
https://ieeexplore.ieee.org/document/1486206
Didn\'t NMOS logic use p-channel depletion mode?
--
Regards, Joerg
http://www.analogconsultants.com/
W
whit3rd
Guest
On Monday, November 21, 2022 at 1:56:14 PM UTC-8, Uwe Bonnes wrote:
I\'m sure they are; this one (zero-threshold) comes close.
<https://aldinc.com/pdf/ALD310700.pdf>
but it\'s a very low-current solution.
P-doped material in Si has lower conductivity (lower carrier mobility)
so there\'s not a lot of interest in discrete PMOS power devices.
If my old handbook isn\'t wrong, AlSb has higher hole mobility than
electron mobility... but no burgeoning technology around that
semiconductor.
John Larkin <jla...@highlandsnipmetechnology.com> wrote:
There don\'t seem to be any. Pity.
Are they physical possible?
I\'m sure they are; this one (zero-threshold) comes close.
<https://aldinc.com/pdf/ALD310700.pdf>
but it\'s a very low-current solution.
P-doped material in Si has lower conductivity (lower carrier mobility)
so there\'s not a lot of interest in discrete PMOS power devices.
If my old handbook isn\'t wrong, AlSb has higher hole mobility than
electron mobility... but no burgeoning technology around that
semiconductor.
L
Lasse Langwadt Christensen
Guest
tirsdag den 22. november 2022 kl. 00.30.20 UTC+1 skrev Joerg:
https://www.aldinc.com/pdf/IntroDepletionModeMOSFET.pdf
On 11/21/22 1:56 PM, Uwe Bonnes wrote:
John Larkin <jla...@highlandsnipmetechnology.com> wrote:
There don\'t seem to be any. Pity.
Are they physical possible?
It seems so:
https://ieeexplore.ieee.org/document/1486206
Didn\'t NMOS logic use p-channel depletion mode?
https://www.aldinc.com/pdf/IntroDepletionModeMOSFET.pdf
B
boB
Guest
On Mon, 21 Nov 2022 12:20:08 -0800, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:
Since they are basically a FET that is biased ON, you COULD use some
high shelf-life battery and a diode (also low leakage) and just change
the battery every 10 years or so ? I know, not elegant but should
work.
boB
<jlarkin@highlandSNIPMEtechnology.com> wrote:
There don\'t seem to be any. Pity.
Since they are basically a FET that is biased ON, you COULD use some
high shelf-life battery and a diode (also low leakage) and just change
the battery every 10 years or so ? I know, not elegant but should
work.
boB
U
Uwe Bonnes
Guest
Joerg <news@analogconsultants.com> wrote:
....
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
....
No, NMOS logic use n-channel depletion mode!Didn\'t NMOS logic use p-channel depletion mode?
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------
J
John Larkin
Guest
On 22 Nov 2022 17:00:17 GMT, Uwe Bonnes
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
I think the MC6800 and maybe 6802, pretty cool uPs in their day, used
what was basically nmos RTL with depletion load pullups. The 6800
needed a weird 2-phase clock at 1 MHz.
I wrote an RTOS for the 6800, which was tricky because it couldn\'t
push the index register onto the stack. And had no hardware multiply.
(I wrote it in ink on paper and mailed it a sheet at a time while
visiting a friend in Juneau Alaska. People at work typed it on
punchcards and assembled it and ran it. They claim that it had one
bug.)
<bon@hertz.ikp.physik.tu-darmstadt.de> wrote:
Joerg <news@analogconsultants.com> wrote:
...
Didn\'t NMOS logic use p-channel depletion mode?
No, NMOS logic use n-channel depletion mode!
I think the MC6800 and maybe 6802, pretty cool uPs in their day, used
what was basically nmos RTL with depletion load pullups. The 6800
needed a weird 2-phase clock at 1 MHz.
I wrote an RTOS for the 6800, which was tricky because it couldn\'t
push the index register onto the stack. And had no hardware multiply.
(I wrote it in ink on paper and mailed it a sheet at a time while
visiting a friend in Juneau Alaska. People at work typed it on
punchcards and assembled it and ran it. They claim that it had one
bug.)