BD131 Spice Model Wanted

On Fri, 08 Apr 2016 16:41:17 -0700, Jim Thompson wrote:

> To use that BJT library just include a "Spice Directive" in your
> schematic: ".LIB C:\Path(s)...\LTwiki_BJT.lib"
> 		
>                                         ...Jim Thompson

Brilliant, Jim. I can't thank you enough for that. I may even burst into 
tears! ;-)
Seriously, though: THANKS.

On Fri, 8 Apr 2016 23:49:54 -0000 (UTC), Julian Barnes
<jb9889@notformail.com> wrote:

>On Fri, 08 Apr 2016 16:41:17 -0700, Jim Thompson wrote:
>
>> To use that BJT library just include a "Spice Directive" in your
>> schematic: ".LIB C:\Path(s)...\LTwiki_BJT.lib"
>> 		
>>                                         ...Jim Thompson
>
>Brilliant, Jim. I can't thank you enough for that. I may even burst into 
>tears! ;-)
>Seriously, though: THANKS.

I've been designing chips since before there was dirt to be older
than... and began using a simulator while dirt was quite young ;-)

I have 111 directories of foundry-specific device libraries (models
and subcircuits), and many of these directories have several
subdirectories, for instance my X-Fab directory has 10 different
processes.

Thus it is unwise to load every library... the time it takes AND there
are multiple processes where devices have the same names.

So my library loading, in PSpice, loads only the common stuff, like
passive components... then the schematic itself has the "Spice
Directive" (*) for the library needed for that particular project.

(*) "Spice Directive" is an LTspice-specific terminology... in PSpice
"LIB" is just a part, grab it, place it, then edit the path to suit. I
use a utility "ClipboardPath" to copy a filename to the clipboard from
Explorer, thus avoiding typos.

I use "ClipboardPath" for many tasks... for example I "Save As" a
schematic, then "ClipboardPath" and automatically type it into the
title block... avoids much pain and agony and errors.
		
                                        ...Jim Thompson
-- 
| James E.Thompson                                 |    mens     |
| Analog Innovations                               |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| San Tan Valley, AZ 85142   Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |
             
           The touchstone of liberalism is intolerance

On Fri, 8 Apr 2016 23:06:19 -0000 (UTC), Julian Barnes
<jb9889@notformail.com> wrote:

>On Fri, 08 Apr 2016 15:21:10 -0700, John Larkin wrote:
>
>> What's the highest 2N number now? 7500 at least. Then there are all the
>> non-2N parts, the 2SKs and the BCXs and your BD thing.
>> 
>> Hardly a "defect" to not have 15,000 transistors in the library. And LTC
>> isn't selling transistors!
>
>"Defect" was perhaps the wrong word. *Shortcoming* would be more 
>accurate. It's only a minor peev, anyway. Mike E and Linear have done a 
>sterling job on this project and deserve huge praise for their efforts.
>
>> Just pick something similar. Or create a model.
>
>I wonder if there's a simple way of taking the contents of that bulk file 
>Jim pointed to and adding all those models to the existing LT library? 
>Anyway, I've saved the *lot* to a thumb drive; a very useful resource 
>indeed. :-)


Transistors aren't all that different, and any one transistor will
have pretty sloppy specs anyhow. I usually just grab a library part
with similar specs, unless there's something special going on.


-- 

John Larkin         Highland Technology, Inc
picosecond timing   precision measurement 

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

On Fri, 08 Apr 2016 17:47:55 -0700, John Larkin wrote:
> 
> Transistors aren't all that different, and any one transistor will have
> pretty sloppy specs anyhow. I usually just grab a library part with
> similar specs, unless there's something special going on.

I've done the same in the past, but it can be a real struggle finding 
something even broadly similar given the tiny range available in LT's 
standard library.

On Saturday, April 9, 2016 at 7:31:05 PM UTC+10, Julian Barnes wrote:
> On Fri, 08 Apr 2016 17:47:55 -0700, John Larkin wrote:
> > 
> > Transistors aren't all that different, and any one transistor will have
> > pretty sloppy specs anyhow. I usually just grab a library part with
> > similar specs, unless there's something special going on.
> 
> I've done the same in the past, but it can be a real struggle finding 
> something even broadly similar given the tiny range available in LT's 
> standard library.

It's usually not that difficult to find the manufacturer's Spice Model and copy it into the LTSpice schematic. This has the advantage that anybody looking at the schematic understands that you've used a manufacturer's spice model.

If the BD131 is EOL with NXP you'd have to find another manufacturer, but google can often find Spice models of old transistors on university web-sites and the like.

Jim's scheme for linking in a Spice model file takes up less space on the schematic, but you have to ship the file with the schematic, which can be more complicated.

-- 
Bill Sloman, Sydney

On Sat, 9 Apr 2016 09:27:42 -0000 (UTC), Julian Barnes
<jb9889@notformail.com> wrote:

>On Fri, 08 Apr 2016 17:47:55 -0700, John Larkin wrote:
>> 
>> Transistors aren't all that different, and any one transistor will have
>> pretty sloppy specs anyhow. I usually just grab a library part with
>> similar specs, unless there's something special going on.
>
>I've done the same in the past, but it can be a real struggle finding 
>something even broadly similar given the tiny range available in LT's 
>standard library.

LT Spice has a lot of mosfets but not many bipolars. That sort of
makes sense.

I mostly use mosfets these days. Bipolars tend to be dumb stuff like
BCX70 or exotic microwave parts that wouldn't simulate well even if I
had a Spice model. 


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics