Definition of HDI circuit board, what does HDI circuit board mean?
HDI circuit board is the abbreviation of high-density interconnect printed circuit board. It is characterized by extremely dense wiring on the bare board and very small line width/line spacing, which can greatly improve the performance of the circuit board. HDI circuit boards are widely used in mobile phones, notebooks, digital cameras and other high-tech products because of their following characteristics:
1. High density: The lines of HDI circuit boards are more closely spaced than conventional circuit boards, and the same number of lines can be completed in a smaller size, thereby reducing the size of the circuit board and making the entire electronic product more miniaturized.
2. Complex process: HDI circuit boards are difficult to manufacture and sometimes require a variety of difficult processes to manufacture. Designers need to consider many factors such as circuit feasibility, wiring density, board thickness, line width, and line spacing.
3. More stable signal transmission: Because the HDI circuit board lines are closer together and the impedance is more consistent, the signal transmission is more stable, effectively reducing the interference caused by the signal.
4. Save space: The use of HDI circuit boards can greatly reduce the area of the PCB board, increase the electronic packaging density of the product, and enhance the integration of the entire electronic product.
HDI circuit boards are mainly composed of inner layer circuits and outer layer circuits. Blind holes (pre-drilled holes, which can be routed through the thickness of the board are called blind holes) and grooves (also known as compression lines) are added to the inner layer lines. ), reducing the number of vias, thereby providing more usable area for high-density outer layer lines.
Especially in miniaturized devices such as mobile phones and laptop computers, HDI circuit boards are widely used. Laptop computers are indispensable for their small size, complex internal structure and high reliability requirements, so HDI circuit boards are indispensable. In the application of mobile phones, the design and manufacturing of HDI circuit boards play a vital role in the survival rate of the device.
In short, HDI circuit board is an advanced form of current circuit board technology. Through continuous technological breakthroughs and innovations, it has been widely used in various high-tech fields, providing strong support for the design and manufacturing of modern technology products.