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HDI in HDI Board is the abbreviation of High Density Interconnector. It is a kind of (technology) for producing printed circuit boards. It uses micro-blind and buried via technology for a circuit board with a relatively high line distribution density. HDI is a compact product designed for small-capacity users.

The semiconductor industry mainly focuses on integrated circuits, consumer electronics, communication systems, photovoltaic power generation, lighting applications, high-power power conversion, and other fields. From the perspective of technology or economic development, the importance of semiconductors is enormous

Printed circuit board (PCB), also known as printed circuit board, is the supplier of electrical connection of electronic components. Its development has a history of more than 100 years. Its design is mainly layout design. The main advantage of using circuit board is that it greatly reduces the wiring and assembly errors, and improves the automation level and production labor rate. According to the number of circuit board layers, it can be divided into single board, double board, four board, six board and other multilayer circuit boards.

As a key component in modern electronic devices, high-speed boards are widely used in communication, computing, consumer electronics, and industrial control.

the difference between longitude and latitude causes the change of substrate size; Due to the failure to pay attention to the fiber direction during shearing, the shear stress remains in the substrate.

Heavy copper PCBs are manufactured with 4 ounces or more of copper on each layer. 4 ounce copper PCBs are most commonly used in commercial products. The concentration of copper can be as high as 200 ounces per square foot.