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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: fast NPN in LT Spice
Date: Mon, 3 Jun 2024 07:50:37 -0000 (UTC)
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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?

-- 
piglet