Post by thread:[EE] SPICE Modeling BJT's

Hi Carlos, Have you tried looking up the manufacturers websites for models? TI & Philips are pretty good & I'm pretty sure Fairchild also has them. I've got a big file somewhere from TI that has a heap of BJT spice models in it - (downloaded). If you need to extract a model from a sample part, it gets a bit more difficult. Pspice has a model generator, but it's only available for diodes in the eval version I use. RP On 28/06/07, Carlos A. Marcano V. <spam_OUTc.marcanoTakeThisOuTgmail.com> wrote: > Hi, list. > > Does anyone know of an internet available guide for extracting BJT's > (and possibly other components) parameters to use them in SPICE models? > Thanks in advance for any pointers. > > Regards, > > Carlos. > -

Hi, Richard. > Have you tried looking up the manufacturers websites for models? TI & > Philips are pretty good & I'm pretty sure Fairchild also has them. Yes, I have. The probloem is that I need some relative older and semi-obscure parts with less probability of obtaining models from the manufacturer (if they still are in the business!). > If you need to extract a model from a sample part, it gets a bit more > difficult. Pspice has a model generator, but it's only available for > diodes in the eval version I use. That is the quid. I am able to obtain the datasheets so I would like to build the models from them. The problem I am facing is that I can't find correspondence between some of the parameters from the datasheets and the models. By the way, I use LTSpice/SwitcherCAD from Linear Tech. <http://ltspice.linear.com/software/swcadiii.exe> It is an EXTREMELY good SPICE simulator. And it is freeware. Regards, Carlos.

>By the way, I use LTSpice/SwitcherCAD from Linear Tech. Then it is probably worth asking on their Yahoo group. There are some very knowledgeable guys there on converting models. You may even find someone has already done it for the device you want. http://groups.yahoo.com/group/LTspice/

Have you tried the LTSpice Yahoo group? They may be able to help. I see these types of things asked over there all the time. Clarence Erickson .....clarence.ericksonKILLspam@spam@gmail.com On 6/28/07, Carlos Marcano <c.marcanoKILLspamgmail.com> wrote: {Quote hidden}> > Hi, Richard. > > > > Have you tried looking up the manufacturers websites for models? TI & > > Philips are pretty good & I'm pretty sure Fairchild also has them. > > Yes, I have. The probloem is that I need some relative older and > semi-obscure parts with less probability of obtaining models from the > manufacturer (if they still are in the business!). > > > If you need to extract a model from a sample part, it gets a bit more > > difficult. Pspice has a model generator, but it's only available for > > diodes in the eval version I use. > > That is the quid. I am able to obtain the datasheets so I would like > to build the models from them. The problem I am facing is that I can't > find correspondence between some of the parameters from the datasheets > and the models. > > By the way, I use LTSpice/SwitcherCAD from Linear Tech. > > <http://ltspice.linear.com/software/swcadiii.exe> > > It is an EXTREMELY good SPICE simulator. And it is freeware. > > Regards, > > Carlos. > -

It is a SDT411 part. I can't recall the original manufacturer right now, I am not at my personal computer right now. I could post that info later after work. Regards, Carlos. On 28/06/07, Richard Seriani, Sr. <.....richard_s633KILLspam.....cox.net> wrote: > Carlos, > > Which particular BJT models are you looking for and from which manuafacturer > (if it matters to you)? > > Richard Seriani, Sr. > > {Original Message removed}