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Double-Sided Flex PCB: Layers, Vias & Bend Planning

Two layers of routing

Double-sided construction provides copper on both sides of a dielectric core. Interlayer connections allow routing flexibility but introduce features that must be considered in mechanical design.

Keep connections outside moving regions

Place vias and component pads away from bends where possible. Review copper balance and trace orientation, and include plating and protective layers in the finished-thickness definition.

Ask for an approved stackup

Confirm core, copper, coverlay and adhesive thicknesses. If impedance is controlled, agree the reference construction and measurement method before layout release.

Make the requirements reviewable.

Define	Include in the review	Why it matters
Mechanical duty	Installed shape, bend location, motion and cycle target	Distinguishes installation bending from service fatigue
Construction	Layer order, copper, film, adhesive and coverlay	Establishes finished thickness and material compatibility
Interfaces	Connector thickness, pad finish and local reinforcement	Controls fit, assembly support and contact reliability
Acceptance	Dimensions, electrical test and applicable standard revision	Creates an agreed basis for inspection and quotation

CONTINUE THE DESIGN REVIEW

Connect the decisions.

Discuss your build requirements →

YOUR NEXT STEP

Bring the requirements.
Start the conversation.

Tell us what the circuit needs to do, how it will bend and when you need it. A complete build brief makes a quote easier to evaluate.

[email protected]

Preparing files?

Include Gerber and drill data, a fabrication drawing and stackup notes. Put related files in one ZIP. Add a BOM and placement file when assembly is required.