topic Re: Circular Cutouts in Footprint Pad in Fusion Electronics Forum

Circular Cutouts in Footprint Pad

anthonyrussoAFCA2 — Mon, 09 Sep 2024 16:14:45 GMT

Hi. I am in the process of creating a footprint for the a Microchip PIC32MM0128GPM048-I/M4 part which uses an exposed pad with circular cutouts within the pad. What is the recommend way to generate this type of cutouts on the top layer?

I have attached two image one of the current layout that I have at this time and another of the layout recommendations from Microchip. I have placed an red annotation on one of the circle cutouts to indicate what I am talking about. The intended diameter(V) of the the cutout is 0.33mm

Re: Circular Cutouts in Footprint Pad

jorge_garcia — Tue, 10 Sep 2024 21:39:05 GMT

Hello @anthonyrussoAFCA2,

I hope you're doing well. So the best way IMO to do this is to use the arbitrary pad shapes functionality. See this blog for full details

https://www.autodesk.com/products/fusion-360/blog/what-you-didnt-know-about-eagle-arbitrary-pad-shapes/

In essence you would replace the center SMD with a large polygon on the top copper layer. You would duplicate the poly on the StencilTop and SoldermaskTop layers that way you would make sure the large pad is exposed. Now the polygon on it's own can't hold the signal. So within the boundary of that polygon you now add Through-hole Pads to make the drills you see in the data sheet.

In the component view, make sure that all of the pads connect to the single pin for the center pad (usually ground).

Let me know if there's anything else I can do for you.

Best Regards,

Re: Circular Cutouts in Footprint Pad

emelialinda296 — Mon, 16 Sep 2024 04:53:20 GMT

thanks for info