XIAMEN DOUBLEPORT-FPC CO.,LTD.

What is a Rigid-flex PCB?

A Rigid-flex PCB combines rigid and flexible PCB technologies into a single hybrid design. This type of printed circuit board features both rigid sections for mounting components and flexible sections for bending or folding, offering durability and versatility.

This hybrid design:

-Reduces connectors and cables

-Simplifies assembly and improves reliability

-Supports miniaturization and complex 3D geometries·

Stack-up and Materials

Rigid-flex PCB combines the advantages of rigid PCB and flex PCB. It is made of flexible material layered on top of rigid material, creating a board that is rigid in some parts and flexible in others. From the picture beside, you can clearly understand the stacking structure of Rigid-flex circuit board.

Understanding materials is key to rigid-flex performance:

Conductors:

Copper types: RA, HA, ED

Common thicknesses: 1/3 oz, 1/2 oz, 1 oz, 2 oz

Adhesives: Selected based on conductor type and end-use

Dielectrics: PI film, FR-4, Solder mask

Thickness: 25 ~ 125 um

Surface Finishes: ENIG, ENEPIG, Hard Gold, Tin, OSP, Silver

Applications

• Aerospace and military: Used in environments requiring high reliability, such as satellites and flight control systems.

• Consumer products: Used in high-end smartphones, tablets, wearable tech, Robot vacuum cleaners, etc.

• Automotive: Used in in-vehicle entertainment systems, sensors, and power systems.

• Medical devices: Rigid-flex PCB suitable for modern medical equipment, such as vital sign monitoring instruments and embedded medical sensors.