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  • Author Author: Jan Cumps
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Create a custom footprint in KiCad 7 - 2b: create the footprint for an SMA coax connector with the editor - copper pour, solder mask clearance, holes, pads

Jan Cumps
Create a custom footprint in KiCad 7 - 2b: create the footprint for an SMA coax connector with the editor - copper pour, solder mask clearance, holes, pads

Part 2b of the exercise to create a custom footprint for the Amphenol /  SV Microwave SF2921-61506-1S   SMA coaxial connector. In the previous post created the initial footprint boundaries. Now: the rest.

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Copper pour and the pads

I first drew a theoretical - good enough - outline on the silkscreen.

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It will have to go later, because the whole area will become exposed copper plane. But for now, it's a good guideline for the other activities:

  • copper plane and solder mask clearance should at least cover this area
  • it shows the centre of poth drill holes, and for the centre pin

I then drew the 2 pours with a polygon:

image 

and SMD pads:

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When you right - click a pad, select Edit as Graphical Shapes, then click again and end that mode, all copper that touches the pad becomes "pad". So I end with two copper polygons that have PAD number 1 and 2. I also put 2 keepout areas on the copper  layer:

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On the front courtyard layer, I drew the real estate that should be respected (purple rectangle in the first image)

Mask clearance

I then put a filled polygon on the front mask, similar to the main copper pour outline. This allows the connector base to sit flush on the plane.

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I added a little clearance on the side where the microstrip exits the connector. This as a hint for the PCB designer that the whole microstrip area should be maskless.

Drill holes

Easy. Because I had the centers on silkscreen , I just had to put pads on those locations. I removed their number, made the copper size 0 and the drill size the correct one for a 0-80 UNF-2B bolt: 

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3/64, according to the internet, is a 0.05 inch hole.

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That's it. The result is this:

On a PCB :

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In 3D view (using the image I downloaded in the very first post):

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