What does hdi mean in PCB industry?

HDI circuit board is the abbreviation of high-density interconnect, and high-density interconnect (HDI) manufacturing is the fastest-growing field in the printed circuit board industry.

From the first 32-bit computer introduced by HP in 1985 to a large client server with 36 sequentially laminated multi-layer printed boards and stacked micro-vias, HDI/ micro-vias technology is undoubtedly the future PCB architecture. Large ASIC and FPGA with smaller device spacing and more I/O pins, as well as embedded passive devices, have shorter rise time and higher frequency.

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Because HDI embodies the most advanced technology of contemporary PCB, it brings fine wiring and micro-aperture to PCB. In HDI multi-layer application terminal electronic products, mobile phone is a model of HDI frontier development technology.

In mobile phones, the thin lines (50 ~ 75 microns /50 ~ 75 microns, line width/spacing) of PCB mainboard become the mainstream, and the thickness of conductive layer and board is thin; The miniaturization of conductive patterns leads to high density and high performance of electronic equipment.

No matter rigid PCB or flexible PCB materials, with the lead-free electronic products in the world, it is required to make these materials have higher heat resistance, so new materials with high Tg, small thermal expansion coefficient, small dielectric constant and excellent dielectric loss tangent are constantly emerging.

Baidu Encyclopedia -—HDI Circuit Board