When should I use PCB HDI in my board design?
When is it adviceable to use a HDI PCB Design in your board when doing designs. What are the things we should look into before choosing HDI as a choice for a design.
Solution
One of the most frequent reasons is the fine pitch of a BGA package or packages that will be used. Such a fine pitch does not allow you to use standard THT vias for the footprint fanout. Then, you have to use microvias. In direct connection with the fine pitch BGA package is the number of pads of the particular package. For, let's say, 500+ pads, you need 8+ layers. It all depends on the PCB stack-up. The higher number of PCB layers inevitably leads you to use microvias because of the PCB thickness (too narrow via holes cannot be used for thick boards). There is all connected.
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