How to Place Embedded Cavities in a PCB

[@Nova-m8d]

Great video

[@blablableep6811]

How the heck does a manufacturer mount smt components inside an embedded cavity? Like a regular stencil would be unable to deposit paste on the pads inside an embedded cavity right?

[@Zachariah-Peterson]

It can be done with an automated solder paste dispenser. You're right you can't do it with a stencil. If automated dispensing is not available it could probably be done by hand depending on the cavity size.

[@vssabah]

How do we show this void in the layerstackup?

[@Zachariah-Peterson]

It does not appear in the layer stackup. If you use Draftsman to create a stackup drawing then it will also not appear in the stackup drawing. You would need to create a custom drawing of the stackup if you want to include a detail showing where the cavity is located. That is why I also mentioned including a fabrication note, it must be made very clear where the cavity is to be located.

[@sXAPOLLls]

OMG, how much it will cost? I just made pcb with simple blind vias 1-2 layer and it costs like 400$ for 10 pcb instead of 20$. This cavities seems like much harder to produce.

[@Zachariah-Peterson]

This is not something meant for budget PCBs, it is meant for more advanced systems that need the additional capability.

[@electroroomi]

Can you share the fabrication note google doc you showed ?

[@Zachariah-Peterson]

Send me a message on linkedin and I'll share it with you. I think you can also find it in the description for the Fabrication Notes video

[@electroroomi]

Thank you ... I have found it ! @@Zachariah-Peterson

[@big_whopper]

I’ve never heard it pronounced “fil-LAY” in engineering. I’ve only used that in kitchens. In ME/EE stuff it’s always been “FILL-it”. Preferences?

[@Zachariah-Peterson]

I've always pronounced it fil-ay and spelled it fill-et. 🙃

[@sb6489]

So the tolerance is 250 um (0.25 mm).

[@Zachariah-Peterson]

Yes that is a typical value for clearance (10 mil). However there is one fabricator I worked with on some boards that allowed the clearance on copper near board outlines to reduce to 8 mils to accommodate one of our very dense boards, and they would say the same about the outline clearance around a cavity because they are using the same tooling.

[@petersage5157]

"...which route to go..." Very clever.

[@Zachariah-Peterson]

👀

[@優さん-n7m]

music is not necessry