HDI-HIGH DENSITY INTERCONNECT PCB
HDI PCBs capitalize on the latest technologies available to increase the functionality of PCBs using the same or less amount of area. This advancement in PCB technology is driven by the miniaturization of components and semiconductor packages that supports advanced features in revolutionary new products such as touch screen computing and 4G network communications.
HDI PCBs are characterized by high-density attributes including laser microvias, fine lines and high performance thin materials. This increased density enables more functions per unit area. Higher technology HDI PCBs have multiple layers of copper filled stacked microvias (Advanced HDI PCBs) which creates a structure that enables even more complex interconnections. These very complex structures provide the necessary routing solutions for today's large pin-count chips utilized in mobile devices and other high technology products. Most HDI boards are with burried/blind vias from 0.076-0..127mm.
Vias for HDI is 3-5 mil (0.076-0.127mm),line width is from 3-4mil(0.076-0.1mm). 0.8mm /0.5mm pitch BGA is usually for 1+N+1. Another thing is many customers did not know HDI board have to use special material--RCC (Resion Coated Copper),0.08mm thickness with copper.
Multilayer standard stack up
PCB Fab check list
Flex PCB material
High frequency material
Heavy copper PCB
20 layer PCB
10 layer PCB
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