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Message from discussion Large signal PSpice transistor models
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legg  
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 More options Nov 13 2012, 1:07 pm
Newsgroups: sci.electronics.design
From: legg <l...@nospam.magma.ca>
Date: Tue, 13 Nov 2012 13:08:57 -0500
Local: Tues, Nov 13 2012 1:08 pm
Subject: Re: Large signal PSpice transistor models
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On Tue, 13 Nov 2012 10:59:50 -0500, legg <l...@nospam.magma.ca> wrote:
>On Tue, 13 Nov 2012 10:26:30 +0100, o pere o <m...@somewhere.net> wrote:

>>On 11/12/2012 07:37 PM, legg wrote:
>>> On Mon, 12 Nov 2012 09:55:50 +0100, o pere o <m...@somewhere.net> wrote:

<snip>

>>> BFR93a in the file I have has CJE of 3.2E-15, similar to BFP405. If
>>> this is altered to 2.2pF, an emitter excursion to -2.5V occurs.

>>> RL

>>Strange, I got it directly from NXP
>>http://www.nxp.com/download/pip/BFR93A/models : +             CJE =
>>2.03216E-012

>>Could you post your whole model, to check if there are more differences?

>>Pere

>Actually a BFR91A model, relabelled BFR93A, in an SOT23 package from
>Philips in 1995......BFR91A was SOT37. Same die.

>Check out the Seimens model, though:

>http://www.dl2jwl.de/pdf/bfr93a.pdf

>These are the values used in the LTspice distro.

>I would like to see the Telefunken file, if there ever was one, but
>Vishay seems to have divested it's bipolar semiconductors entirely,
>since having 'incorporated' their ass.

The last Telefunken (Temic) datasheet for bfr93 lists S parameters.

It looks like the Siemens spice model has a typo fF for pF. There's no
way CJC could be three orders of magnitude larger than CJE in the same
part.

RL


 
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