PSPICE LAYOUT PROBLEMS

[Lost'n Found]

Hello,

I am trying to implement a small design on a PCB for the first time. I am
using Orcad Pspice Family 9.2 Layout Plus

I drew the design in Capture, created Netlists. However, I realized that all
components I use don't have footprints, and I have to manually specify them.

For example, say I have 5 resistors. When I go the properties of any of
those resistors (or other components), the Footprint cell will be empty.

I tried to go to Layout Plus and search through the Library manager, but
there didn't seem to be a trivial library which contains resistors and other
basic components.

My questions are:
Am I asking in the right Newsgroup?

If No, where whould I ask?

If yes:

Is Capture supposed to automatically figure out which footprints to use for
basic components?

How can I figure out which library to use for these components? Lets say I
wanted to use a transistor now, 2n222


Are the footprints supposed to be built in? (At least these basic ones!)

Thank you very much in advance.

 

[linnix]

Hello,

I am trying to implement a small design on a PCB for the first time. I am
using Orcad Pspice Family 9.2 Layout Plus

I drew the design in Capture, created Netlists. However, I realized that all
components I use don't have footprints, and I have to manually specify them.

For example, say I have 5 resistors. When I go the properties of any of
those resistors (or other components), the Footprint cell will be empty.

I tried to go to Layout Plus and search through the Library manager, but
there didn't seem to be a trivial library which contains resistors and other
basic components.

They are so simple. Why do you need the library? Just two or three
pads or holes.

My questions are:
Am I asking in the right Newsgroup?

Yes, but people do things differently. I generate them in a C
program.

If No, where whould I ask?

If yes:

Is Capture supposed to automatically figure out which footprints to use for
basic components?

How can it tell whether you use SMT or not?

How can I figure out which library to use for these components? Lets say I
wanted to use a transistor now, 2n222

Don't know any 2n222. You can use SOT-23 (SMT) or TO-92 (TH) for
2N2222.

Are the footprints supposed to be built in? (At least these basic ones!)

They should be somewhere, but not tieing to the components.

 

[qrk]

Hello,

I am trying to implement a small design on a PCB for the first time. I am
using Orcad Pspice Family 9.2 Layout Plus

I drew the design in Capture, created Netlists. However, I realized that all
components I use don't have footprints, and I have to manually specify them.

For example, say I have 5 resistors. When I go the properties of any of
those resistors (or other components), the Footprint cell will be empty.

I tried to go to Layout Plus and search through the Library manager, but
there didn't seem to be a trivial library which contains resistors and other
basic components.

My questions are:
Am I asking in the right Newsgroup?

If No, where whould I ask?

If yes:

Is Capture supposed to automatically figure out which footprints to use for
basic components?

How can I figure out which library to use for these components? Lets say I
wanted to use a transistor now, 2n222


Are the footprints supposed to be built in? (At least these basic ones!)

Thank you very much in advance.

Although, I'm not real familiar with Capture, I enter the footprints
in manually when stuck having to use Capture. You can also use a stuff
file if you want to save some time. Perhaps CIS is helpful.

What do you consider a basic part. For me, my standard resistor is a
0402 conforming to a reflow soldering process. One of my customer's
standard resistor is 0805 with a standard board thickness of 0.093".

What kind of resistors are you using? Thru-hole or surface mount? What
wattage? What PCB specification do you need to adhere to (MIL spec,
commercial, high vibration, ...)? If surface mount, what sort of
assembly process (wave solder or reflow)? These all make a difference
on what sort of footprint you will choose.

2N2222 comes in a few package styles. A real 2N2222 is a TO18 package.
However, you can get them in TO92 or SOT23 with a different prefix.
BTW, the TO18 and TO92 packages are in the to.llb library.

You can find common surface mount resistor and capacitor footprints in
sm.llb. Through hole in tm_*.llb.

You will find that the Orcad supplied footprints need lots of help.
For a production board or a complex board, I wouldn't use the Orcad
footprints directly. Generally, one will either create their own
footprint or modify an Orcad supplied footprint and store it in their
own library. If you plan on using Layout, learn to make your own
footprints as there are many parts not covered in the Orcad libraries.
Every time I do a new PCB project, I always end up making a new parts.

 

[Hammy]

Hello,

I am trying to implement a small design on a PCB for the first time. I am
using Orcad Pspice Family 9.2 Layout Plus

I drew the design in Capture, created Netlists. However, I realized that all
components I use don't have footprints, and I have to manually specify them.

For example, say I have 5 resistors. When I go the properties of any of
those resistors (or other components), the Footprint cell will be empty.

I tried to go to Layout Plus and search through the Library manager, but
there didn't seem to be a trivial library which contains resistors and other
basic components.

My questions are:
Am I asking in the right Newsgroup?

If No, where whould I ask?

This group may have been a better choice for CAD related ?
sci.electronics.cad

If yes:
Is Capture supposed to automatically figure out which footprints to use for
basic components?

No layout package I know of can do this.Some may have a default
footprint in the parts properties but dont assume its correct.

How can I figure out which library to use for these components? Lets say I
wanted to use a transistor now, 2n222

For a thru hole 2n2222a for example I would use a TO/92/100 footprint,
this gives you more room to resize the pads (easier if your fabbing
your PCB yourself). Just be sure the pins are properly matched to the
footprint. Thru- hole resistor footprints are located in TM axial
library. Most of the components you listed if not all will be in one
of the TM libraries you just have to select the proper size. If you
don't have a footprint just browse through similar packages and resize
one.

Are the footprints supposed to be built in? (At least these basic ones!)

Thank you very much in advance.

Just so you know OrCAD layout is being discontinued, so if you are
just starting out you may want to try and learn an alternative layout
package.