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#Post#: 81--------------------------------------------------
Ge vs. Schottky
DIR By: Robert
Date: February 11, 2025, 11:34 am
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I thought a GE diode (1N34A) would have a much lower forward
voltage Vd at low Id than a Shottky diode.
This is confirmed by the Id vs. Vd diagrams and electrical data
in the datasheet.
Is the model for the 1N34A trustworthy?
Robert
#Post#: 83--------------------------------------------------
Re: Ge vs. Schottky
DIR By: MC12
Date: February 15, 2025, 3:54 am
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This seems to fall into [member=6]Rohit[/member]'s area of
expertise.
#Post#: 84--------------------------------------------------
Re: Ge vs. Schottky
DIR By: Rohit
Date: February 18, 2025, 9:10 am
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Yes, the model of 1N34A is not accurate. But beware: it is not
uncommon to find inaccurate models bundled with simulation
software. I have found grossly incorrect device models in PSpice
and LTSpice. See this video:
HTML https://www.youtube.com/watch?v=DSDiIkKQaAE
and also
HTML https://youtu.be/qpieD-vG66A?t=430
One should not solely rely on simulators, breadboard is must.
Now coming to 1N34A, this is a super old device and I could not
find any manufacturer supplying its model, the one in MC12 is
may be made by some hobbyist for quick prototype. All the
datasheet of this diodes available, have very basic information,
too less to make accurate model. So could not model it using
MC12's model Program or any other program. A google search gave:
.MODEL D1N34 D(IS=200P RS=84M N=2.19 BV=60 IBV=15U
+ CJO=4.82P VJ=.75 M=.333 TT=144N
Again, may be made by some third party. However it seems to be
more accurate but due to very less information in datasheet, the
level of accuracy cannot be determined.
#Post#: 85--------------------------------------------------
Re: Ge vs. Schottky
DIR By: Robert
Date: February 18, 2025, 10:16 am
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Thank you for your posting, it confirmes what I thought about
the model.
Because I needed a Germanium diode and I couldn't find anything
like OA91, OA95, AAZ17, etc., I ordered the 1N34A, although I
new from different sources, that in most cases one wouldn't get
a real Ge diode.
My measurements revealed that the diode I received has a much
higher forward voltage than a Ge type normally has.
There are a few manufacturers selling (hopefully) genuine 1N34A
for a far higher price than advertised by the "cheapy" sources
on the internet.
#Post#: 86--------------------------------------------------
Re: Ge vs. Schottky
DIR By: MC12
Date: February 18, 2025, 11:03 am
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Perhaps the model was build by somebody simulating a dodgy
"1N34A" rather than a real one, and knew no better!
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