Posted by1 year ago
Castellated Edges. Castellations are small plated edges, typically used for making circuit boards into small pcb modules. These are often seen on wireless modules, such as the ESP8266-12E. While we don’t offer full support for castellations, they can be fabricated if you don’t mind a few minutes of rework and verification of the PCBs. Bisecting the hole at the end of the process is the incorrect way to do this. The proper way to form a castellation is to CNC rout somewhere between electroless copper deposition but.
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Castellated Holes vs. Pads for Module
I am designing a multi-chip module that will be soldered directly to a PCB. The required form factor needs a pad pitch of 20mil. I know that the usual way of doing solder-down PCBs is to use castellated holes, but at a 20mil pitch that looks like it will lead to a pretty expensive process.
It would be much easier from a design perspective to just do exposed pads on the bottom and assemble the module as though it were an LGA. Is this a bad idea? If so, why? Could I maybe get the edges plated without the holes? Any other suggestions for approaching this issue?
![Altium castellated holes vs Altium castellated holes vs](/uploads/1/2/5/6/125608629/272365242.png)
Thanks!
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