What is the difference between FPC and rigid-flex?

An FPC is entirely flexible and usually plugs into connectors on rigid boards, while rigid-flex laminates rigid sections and flex layers into one continuous board. FPC is cheaper and simpler; rigid-flex removes connectors entirely for higher reliability in tight spaces.

When is rolled annealed copper required?

For dynamic applications where the circuit flexes repeatedly, such as hinges and print heads, rolled annealed copper's grain structure survives orders of magnitude more cycles than electro-deposited foil, which suits flex-to-install uses only.

What should an FPC RFQ include?

Layer count and stackup, copper weight, minimum line and space, coverlay openings, stiffener locations and materials, bend zones with radius and cycle expectations, plating finish, and connector or ZIF interface dimensions with tolerance.

Editorial Technical Reference

Flexible Printed Circuit (FPC)

This page explains how Flexible Printed Circuit (FPC) is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Thin circuit built on flexible polyimide film that bends, folds, and rolls, connecting or replacing wiring in compact electronic assemblies.

View Full Specifications Explore Manufacturing Sources

Representative manufacturing scene; not a photograph of a specific supplier or model.

Product Specifications

Technical details and manufacturing context for Flexible Printed Circuit (FPC)

Definition

A flexible printed circuit consists of copper conductors laminated on polyimide or polyester film, protected by coverlay, and optionally reinforced with stiffeners at connector zones. FPCs replace wire harnesses in devices where space, weight, or repeated movement rule out rigid boards: smartphone display and camera links, battery connections, printers, automotive sensors, and hinge interconnects. Constructions span single-sided, double-sided, and multilayer builds with thicknesses from roughly 0.05 to 0.4 mm, supporting fine lines to 0.05 mm and millions of dynamic flex cycles when designed with rolled annealed copper.

Working Principle

Copper foil bonded to polyimide film is imaged, etched, and covered with a coverlay film that leaves pads exposed. Layers are laminated and through-holes plated for double-sided or multilayer builds, then outlines are die- or laser-cut. The polyimide substrate carries the conductors while allowing elastic bending within the designed radius.

Common Materials

polyimide base film, rolled annealed or electro-deposited copper foil, adhesive or adhesiveless laminate, coverlay film, FR-4 or polyimide stiffeners

flex life:	flex-to-install up to millions of dynamic cycles
line space:	down to 0.05/0.05 mm
termination:	ZIF fingers, hot-bar solder, connectors, ACF bonding
construction:	single-sided, double-sided, multilayer, adhesiveless available
thickness range:	0.05-0.4 mm typical

Flexible Printed Circuit (FPC)

Product Specifications

Industry Taxonomies & Aliases

Application Fit & Sizing Matrix