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Partial HDI refers to the targeted use of HDI, usually on one section of one layer of the board. It offers designers an avenue for escape routing from BGAs with a pitch of .5 mm or less, when a mechanically drilled plated through-hole is impossible. With HDI relegated to one layer of the board, fabricators can avoid the expense of sequential lamination cycles.
In the October issue of Design007 Magazine, our expert contributors provide a complete, detailed view of partial HDI. Most experienced PCB designers can start using this approach right away. But you need to know these tips, tricks and techniques first.
