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Partial HDI can be the perfect solution for designers faced with escape routing from tight-pitch BGAs. But there are a variety of material, signal integrity, and DFM trade-offs to understand before you get fully into partial HDI.
We asked Stephen Chavez to explain the fundamentals, as well as the details, of this promising process. Are you using partial HDI?
Andy Shaughnessy: What does a partial HDI PCB look like?
Stephen Chavez: A partial high density interconnect (HDI) PCB looks similar to a traditional PCB but with HDI features on some layers, but not all layers. It usually involves a combination of standard through-hole vias along with laser-drilled microvias and possibly buried/blind vias in the outer layers. The internal layers may be manufactured using conventional PCB processes, while only specific layers have the finer features associated with HDI construction.
To read this entire conversation, which appeared in the October 2024 issue of Design007 Magazine, click here.
