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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: fast NPN in LT Spice
Date: Mon, 03 Jun 2024 07:09:40 -0700
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On Mon, 3 Jun 2024 07:50:37 -0000 (UTC), piglet
<erichpwagner@hotmail.com> wrote:

>john larkin <jl@650pot.com> wrote:
>> On Sun, 2 Jun 2024 20:35:02 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>> 
>>> "john larkin" <jl@650pot.com> wrote in message
>>> news:4n2q5jln0sb9oqbfp81jm723tbjf7tol80@4ax.com...
>>>> On Sun, 2 Jun 2024 19:46:14 -0400, "Edward Rawde"
>>>> <invalid@invalid.invalid> wrote:
>>>> 
>>>>> "john larkin" <jl@650pot.com> wrote in message
>>>>> news:eqsp5jde87vqs6du4a7djoalag7kpkuhkr@4ax.com...
>>>>>> There are many NPNs in the standard LT Spice library.
>>>>>> 
>>>>>> Does anyone know of a fast, RF type, transistor? It's hard to tell
>>>>>> from the jillion lines of fine-print parameters.
>>>>> 
>>>>> https://www.google.com/search?q=".model+BFR92A"
>>>>> 
>>>>>> 
>>>>>> I want to make a model of the MC10EP89 gate.
>>>>>> 
>>>>> 
>>>> 
>>>> That doesn't seem to be in the LT Spice library.
>>>> 
>>>> 2SC3838K looks OK.
>>>> 
>>>> It's hard to pick parts, discrete or ICs, from the library.
>>> 
>>> Yes it would be nice if a description of the part as well as the part
>>> number could be included.
>>> 
>>>> 
>>> 
>> 
>> A sortable column of Ft would be nice for transistors. Lacking that,
>> sorting on Vce helps spot the RF parts. Low voltage suggests RF.
>> 
>> 
>> 
>> 
>
>Ft isn’t one of the model parameters, guess you have to look for low Tf and
>Tr transit times or low junction capacitances?

Agreed, but reading hundreds of lines of fine print, or looking up
hundreds of data sheets, is a nuisance.

I sorted on lowest Vce and then found the capacitances and then looked
up the data sheets. LT Spice is not friendly to people with bad
vision.

I should have used one of the LS3xx parts. They have Vceo and Ic both
= 0.