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Storm Circuit made a lot of HDI circuit boards. Any layer HDI is the most complex circuit boards that the holes can be from any layer to any layers.We made an any layer HDI PCB for audiophile earphones. Any other HDI PCB is easier to do .Send us your HDI files now. HDI--HIGH DENSITY INTERCONNECT Boards contain blind and/or buried vias and often contain microvias of .006 or less in diameter. They have a higher circuitry density than traditional circuit boards. There are 6 different types of HDI boards, through vias from surface to surface, with buried vias and through vias, two or more HDI layer with through vias, passive substrate with no electrical connection, coreless construction using layer pairs and alternate constructions of coreless constructions using layer pairs. The PCB specifications :
FR4,8 layer TG170,material:TU-768 (made in Taiwan) 1OZ Black solder mask White silkscreen Immersion Gold 0.8mm thickness min via:0.15mm min trace/space:0.076mm/0.076mm Via In Pad,filled and plated to flat. Blind vias :L1-L2,L1-L3,L1-L4,L1-L5,L1-L6,L1-L7
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