What Is a Multilayer Flexible Printed Circuit (FPC)?

Circuits are the building blocks for nearly all electronic devices. A circuit, of course, is a controlled electrical path. It consists of a loop that begins, ends and repeats at a power source. A closed circuit means this loop is complete. An open circuit, on the other hand, means this loop is incomplete or broken.

There are rigid circuits and flexible printed circuits (FPCs). Rigid circuits are stiff, whereas FPCs are able to flex. While all FPCs are flexible, some of them feature more conductor layers than others. Multilayer FPCs fall under this category. What is a multilayer FPC exactly, and how does it differ from other types of FPCs?

Overview of Multilayer FPCs

A multilayer FPC is a type of FPC with at least three conductor layers. Conductor layers, of course, are layers of material that are electrically conductive. They often feature conductive traces. As electricity travels through the device, the conductive layers will determine its route.

Some FPCs only have a single conductor layer. Other FPCs have two or more conductor layers. The term "multilayer FPC" refers to any FPC with at least three conductor layers.

All FPCs have conductor layers. The conductor layers serve as the path for electricity. Multilayer FPCs, though, are designed with at least three conductor layers.