Making Printed Circuit Boards with Orcad Layout Part 4

(Modifying Parts)

The headers in Layout are 0.1", but the ones we have are 0.2". For my design I will need two headers of 12 contacts.

Double check that the component button from the tool bar and "TOP" for the layer is selected, then right click on the workspace and select "New...".

I'll choose J1 for my "Reference Designator" and then click on "Footprint..."

The footprint that comes the closest is the positive lock connector library (PCON100T). We will use the POLCON.100/VH/TM1SQS/W.300/ footprints so that the pins are in the middle of the block and since I need a 12 pin header I will select a 23 pin footprint. I have chosen 23 because my pins are 0.2" apart instead of 0.1" and then take off 1 so the last pin is near the silk screen ([12 x 2] - 1 = 23).

To modify the part, click on the Library Manager button on the tool bar .

Find the footprint POLCON.100/VH/TM1SQS/W.300/23 in the PCON100T in library and then press "Save as...". I put mine in a new library and named it "Header 12" so I can find it for future projects.

Now I can make changes without changing the main library.

First get rid of the unwanted pins by using the pin tool from the tool bar .

to

Then move the pins so that there are 0.2" apart. If the grid wont allow you to place the pins in the right places then click on "Options" then "System Settings..." and change the Place grid to 10. Then press "OK".

The part should look like this.

I will also delete the 23 or change it to a 12.

Save the new footprint and close the library manager.

Now replace the old footprint with the new one.

Double click on on of the header components and then press "Footprint".

Select the footprint you just saved.

Select "Replace footprint for all components" so that J2 changes as well.

It's okay if it says that the new component has fewer pins. You just went from 23 to 12.

It looks like I need an extra 0.1" to 0.2" to fit everything.

Select the Obstacle button from the tool bar .

Select the Global Layer from the layer pull down list .

Stretch out the yellow board outline to get the new shape.

Go to "Making Printed Circuit Boards with Orcad Layout Part 5"

Last Modified: 10/04/04
MAE433 WEBMASTER

[ MAE224 ] [ MAE412 ]

	Select "Replace footprint for all components" so that J2 changes as well.
	It's okay if it says that the new component has fewer pins. You just went from 23 to 12.

	It looks like I need an extra 0.1" to 0.2" to fit everything.
	Select the Obstacle button from the tool bar .
	Select the Global Layer from the layer pull down list .
	Stretch out the yellow board outline to get the new shape.