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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.
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:
and SMD pads:
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:
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.
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:
3/64, according to the internet, is a 0.05 inch hole.
That's it. The result is this:
On a PCB :
In 3D view (using the image I downloaded in the very first post):
