Multilayer flexible printed circuits

Multilayer Flexible Printed Circuits feature three or more layers of conductors separated by a dielectric, usually polyimide, in which the internal conductors can be interconnected by way of plated through holes. As in the previous flex family members, covercoats may be used on one or both sides. While the number of conductor layers designed into this type of flex are limitless, package size, layer count vs. flexibility must be considered during design layout to ensure ease of installation. Typical multilayer flex circuits range from 3 to 6 layers of conductor.