Layer Stackup in Rigid-Flex PCB

A rigid-flex PCB Stackup is a type of PCB that has both rigid and flexible layers. You should choose the best stackup type for your project.
rigid Flexible PCB

What is Rigid-Flex PCB?

Rigid-flex circuit board combines the best of both rigid circuits and flexible circuits integrated into one circuit. The two-in-one circuit is interconnected through plated through holes (PTH). Rigid-flex PCB provides higher component density and more convenient installation. Rigid-flex PCB boards enable flexible assembly in complex three-dimensional spaces.

What are the features of rigid-flex PCB stackup?

Due to the particularity of the stacking design of the rigid-flex PCB board, it has different characteristics and advantages from rigid PCBs and flexible PCBs, such as:

  • Fewer solder joints and connectors
  • Thinner board thickness
  • better thermal performance
  • high aspect ratio

The types of rigid-flex PCB stackup

Like many other types of printed circuit boards, the stacking methods of rigid-flex PCB boards are also divided into single-sided rigid-flex boards, double-sided rigid-flex boards, and multi-layer rigid-flex boards.

Rigid-Flex Stackup Example

Rigid-flex PCB Stack up
The Flexible area and rigid area in rigid-flex PCB
4 layer rigid-flex PCB (2 layer flexible circuit)
4 layer rigid-flex PCB (2 layer flexible circuit)
4-Layer Rigid Flexible Circuit Board stackup
4-Layer Rigid Flexible Circuit Board stackup
4-layer combination rigid flex circuit has four conductive copper layers. Typically, a four-layer has two flexible layers and two rigid layers.
4-layer combination rigid flex circuit has four conductive
6 Layer Rigid Flex PCB - Two flex layers and four rigid layers
6 Layer Rigid Flex PCB - Two flex layers and four rigid layers
Six-Layer Rigid Flex - Four flex layers and two rigid layers.
Six-Layer Rigid Flex - Four flex layers and two rigid layers.
8 Layer Rigid Flex PCB - Four flex layers with air gap and four rigid layers
8 Layer Rigid Flex PCB - Four flex layers with air gap and four rigid layers
8 Layer Rigid Flex PCB - Six flex layers with air gaps and two rigid layers.
8 Layer Rigid Flex PCB - Six flex layers with air gaps and two rigid layers.

Rigid-Flex Board Stackup Design Guidelines and Helpful Resources

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