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From: legg <l...@nospam.magma.ca>
Newsgroups: sci.electronics.design
Subject: Re: Large signal PSpice transistor models
Date: Tue, 13 Nov 2012 13:08:57 -0500
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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