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2025.07.18
What is an FPC? Part2 – Single and Double sided FPC
ColumnSingle-Sided FPC
A single-sided FPC is constructed with a single layer of copper foil laminated onto one side of a polyimide film. This is the most basic structure that fully takes advantage of the FPC’s signature features－extreme thinness and flexibility.
It is commonly used in applications where the FPC needs to retain a folded shape, such as the connection between LCD panels and mainboards. It also offers excellent low spring-back characteristics, which helps reduce power consumption in motor drive systems for devices like hard disk drives (HDDs), where repeated bending is required.
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Double-Sided FPC
Double-sided FPCs have two layers of copper foil－one on each side of the polyimide base film. Compared to single-sided FPCs, they are generally thicker and less flexible. However, with careful selection of materials and structural design, their performance can be brought close to that of single-side types.
When using the same design rules (such as conductor width and trace pitch), a double-sided FPC can reduce the overall board size by approximately half compared to a single-sided layout.
This type of FPC also allows for reverse-side (front-to-back) routing, crossover wiring, controlled impedance design for high-speed transmission, and higher density wiring and component mounting.
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