Exhibitors List of Aspect Ratio
The higher the aspect ratio of a PCB, the smaller the PCB via is. This requires a sophisticated manufacturing technology, and so the wafer test board must be more than 20. If the PCB vias are small, it is challenging for the via walls to be conductive. Thus, choosing the proper equipment design to enable the chemical solution to flow through the vias quickly to provide sufficient copper deposition and allow the generated gas (hydrogen) to drain off rapidly has become the focus of attention. It is also vital to consider the types and conditions of the chemical solution used.