Re: fast NPN in LT Spice

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.