Best Footprint Practice for PCB123 / AVX 9276

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Best Footprint Practice for PCB123 / AVX 9276

Postby DBrunermer » Tue Jun 05, 2012 11:09 am

I'm designing a circuit board that uses a connector from AVX/ELCO, and I'm not sure what the best way to model the footprint is in PCB123. The catalog (Page 5 of: http://www.avx.com/docs/Catalogs/9276.pdf ) shows two pads per pin, the two pads are shown connected together in copper, and then covered in solder resist. The pads are not the same size. I could make an 8 pin part and symbol, I suppose, and fix it up in the schematic, but I'd have to remember it every time.

I might be describing my problem poorly. Please take a look at the manual and tell me what you think.
Thanks, Dan B.
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Re: Best Footprint Practice for PCB123 / AVX 9276

Postby Sal Hernandez » Tue Jun 05, 2012 12:41 pm

I would suggest making the 8 pin part on the schematic and a footprint with 8 pins tied together using a filled polygon. But if you want to create half of the pads using polygons read on.

The only way to make this footprint with only four pins is to use polygons as pins. You would have four pins then use polygons to create the other four. Using polygons to create pads in a footprint is possible but requires more work and leaves errors on the layout that you will not be able to resolve. This footprint already requires a polygon to make the connection between pins which will result in drc, so in this case it would just make footprint creation harder. You could use 4 standard pin for the bottom row of the footprint. Then for the top row draw filled polygons for the pads. Once you have the pads in place you will need to create solder mask openings for the pads. Create filled polygons that are approximatley 6 mils larger than the polygon pads you created and move the new polygons to the top solder mask layer. Now move the mask openings into position above the polygon pads. Once you have all of the pads in place draw you silkscreen outline and save your footprint.
Regards,

Sal Hernandez
Software Support Engineer I
Sunstone Circuits
13626 S. Freeman Road
Mulino, OR 97042
Phone: 503-829-9108 x226
Fax: 503-829-5482
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Re: Best Footprint Practice for PCB123 / AVX 9276

Postby alisadu » Fri Jun 29, 2012 1:47 am

i have the same question with you, i am going to try 8 pins and 16 pins
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