Making a footprint

Making your own components and patterns, organizing and using libraries.
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grieblm
Posts: 40
Joined: 19 Dec 2010, 07:28

Making a footprint

#1 Post by grieblm » 01 Feb 2011, 16:33

I'm trying to make the attached footprint. Any help would be appreciated. This is basically a SON-8 package with 4 pins joined to make a thermal pad.
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Alex
Technical Support
Posts: 3247
Joined: 14 Jun 2010, 06:43

Re: Making a footprint

#2 Post by Alex » 02 Feb 2011, 06:08

You should use polygonal pads for this.
Create a shape on signal layer (choose "signal" layer from drop-down menu, select "polygon" tool and define points on design area), then right click on its outline and select "Convert to pad" from submenu.

falingtrea
Posts: 15
Joined: 09 Jul 2010, 13:03

Re: Making a footprint

#3 Post by falingtrea » 02 Feb 2011, 15:34

The main problem you may run into is that DipTrace does not allow multiple pins in a schematic symbol to be connected together in the pcb pattern. If you design your schematic symbol with 5 pins, it will work ok. If the schematic symbol has 8 pins and you try to connect 4 pins to one pad, the pattern editor complains. Or you get drc errors in the pcb layout program.

grieblm
Posts: 40
Joined: 19 Dec 2010, 07:28

Re: Making a footprint

#4 Post by grieblm » 03 Feb 2011, 08:08

Alex wrote:You should use polygonal pads for this.
Create a shape on signal layer (choose "signal" layer from drop-down menu, select "polygon" tool and define points on design area), then right click on its outline and select "Convert to pad" from submenu.
Thanks everyone. I found this option after posting. I ended up just making a 5-pin part. I guess it would be possible to make some dummy pins for the extra pins in the schematic part.

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