HDI PCB

       HDI is the abbreviation for High Density Interconnector. HDI PCB is defined as a PCB with a higher wiring density per unit area than conventional PCB. They have finer lines and spaces, smaller vias and capture pads and higher connection pad density than employed in conventional PCB technology. HDI PCB is used to reduce size and weight, as well as to enhance electrical performance of the device. HDI PCB is made through Microvia and buried vias and sequential lamination with insulation materials and conductor wiring for higher density of routing. HDI PCB is the best alternative to high layer-countand expensive standard laminate or sequentially laminated boards. 

      Concerning the electrical requirements for high-speed signal, the PCB must possess some AC characteristics, such as impedance control, high-frequency transmission capability and reduce unnecessary radiation. Multi-layered design is necessary for the structure of Stripline and Microstrip. In order to lesson the quality issues of signal transmission, the insulating material with low dielectric factor and low attenuation ratio is applied. Duo to the miniaturization and arrays of the electronic components, the PCB must be improved in the density. Along with the outcome of the assembling methods of Ball Grid Array, Chip Scale Package and Direct Chip Attachment, the PCB is featured with unprecedented high-density. The hole with a diameter less than 150um is known as Microvia. It can improve the effectiveness of assembly and space utilization and so on. It’s also necessary for the miniaturization of electronic products.