Re: Wanted: LM-709 (Spice model) National Op-Amp

Well, there was one recommendation to you that you could just enter the schematic
from the data-***.  I was told by several people that doing that would
be pretty fruitless.  You don't have the process models and the schematic
leaves out sub-circuits that would affect the results. I know of no semiconductor
vendor that would publish a schematic detailed enough to let you simulate
it since that would allow others to reverse engineer the part.

Hang on, yeah, I just went to National's website.  The LM709 is obsolete.
It is not being sold as of last month.  It is a pretty hard sell to
management to put resources into a product they don't sell anymore.

Pease wanted to know what the heck you were designing with this old
part anyway.  National's website says to substitute a LM101 or a LM108,
you can still get both in hermetic packages.

Paul

Neil wrote: 
Paul Rako wrote:
First, save any effort in contacting National.
We have better things to do then make SPICE models
for 30-year-old parts.

True, Paul I wouldn't mind having the spice model from national for
it,just the same. I very fond of the of 301,709, and others, and
because they were designed many years ago, anyone interested in op-amp
design, can learn alot from these two SUPER Op-Amps!!

I know I have............:)

I'm hoping maybe NATIONAL SEMICONDUCTOER will change it's mind one day
to bring out the model for the LM709:)
One fellow gave me a spice netlist for his model of the LM709, which
I'm going to try today.

Neil

.

Quantcast