PCB Manufacturer with HDI Circuit Board fabrication for PCB and PCBA Printed flexible printed circuit (PCBs) have actually come to be an indispensable part of electronic devices, enabling for compact and effective layouts. One of the arising patterns is the high-density interconnect (HDI) PCB, which permits for small circuit layouts by utilizing microvias and hidden vias, making it ideal for tools that need high efficiency in a tiny type factor, such as smartphones and wearable innovation.