nRF52833 aQFN package

RE: nRF52833 aQFN package

Asbjørn — Fri, 01 Aug 2025 13:30:43 GMT

Hi,

Normally use 1oz copper for our DK and sometimes thinner. I'm not sure how the trace edge and pad would look like on 2oz, if they are sloped or if the manufacturing process require a higher temperature or longer temperature ramp up time to make sure it's evenly heated? I'm asking to try to understand what sort of parameters related to the manufacturing you know have changed compared to a 1oz build.

Best regards

Asbjørn

RE: nRF52833 aQFN package

MBarBurtonems — Mon, 28 Jul 2025 20:40:34 GMT

Hi,

I'm still looking for input on this.

Thanks

RE: nRF52833 aQFN package

MBarBurtonems — Thu, 24 Jul 2025 18:23:04 GMT

We usually make several thousand per job and we have about 15% fallout due to bridges. All of the bridges happen on our via-in-pads, mostly on the inner rows of pins. The via-in-pads are 15mil diameter and plugged, the solder mask defined opening is 12mils, our paste aperture is 11.8mils.

RE: nRF52833 aQFN package

Asbjørn — Thu, 24 Jul 2025 11:42:43 GMT

Hello,

Solder mask would be recommended for all pads. The small spacing between them is challenging and if you are implementing on some we would recommend to implementing it on all.

How many units did you assemble and were they all faulty? Any particular set of pins you've had more issues with than others?

Best regards

Asbjørn