As data rates climb from 112G PAM4 toward 224G PAM4 and beyond, electronics designers are discovering that traditional stripline and microstrip geometries are no longer sufficient. The physics simply break. Rise times are now in the single‑digit picosecond range, loss budgets are measured in millimeters, and even tiny discontinuities can collapse a PAM4 eye.

Flex and rigid-flex PCBs are shaping the future through a range of innovative applications, including neural interface arrays that redefine brain-machine communication in the medical field. For decades, scientists and engineers have dreamed of tapping into this electrochemical symphony, and flex PCBs are finally making that dream clinically viable.

The electronics industry has experienced a renaissance in semiconductor package technology, driven by the need to maximize electronic product functionality while minimizing the area reserved for component mounting and interconnects. Passive surface mount components are relatively small, while the packaged semiconductor die is significantly larger than the tiny die element it encases. The plastic-packaged semiconductor, although suitable for use on PCBs, is far too bulky for those developing electronics that require miniaturization: new product introduction systems for physically stressful operating conditions, such as aeronautics, military ordinance, and space missions.