Semi-Flex PCBs

PCB Portfolio

Semi-Flex PCBs

Semi-flex PCBs use specialized FR-4 materials and a specific manufacturing method to create a flex-to-install design that can provide an economical solution for certain applications.

Semi-flex PCBs often can function as a more than adequate solution for certain more advanced applications, while manufacturing is less complicated. Often, it’s a way that combines the best of both worlds. You can bend the board one time to fit the finished product, while not complicating things unnecessarily by laying on a higher level of technology than necessary.

You can always contact your local NCAB Group company if you need further information or assistance, we are happy to help you.

Semi-Flex PCB – Technical specification

FeatureNCAB´s technical specifcation
Number of layers1 – 12 layers, with 1 – 2 conductive layers in bending area.
Technology highlightsThe process uses controlled depth routing of the FR-4 to achieve a flexible / bending section within a traditionally rigid FR-4. Only suitable for static operations – bends typically just for installation. A lower cost solution for some very specific “flex-to-fit”applications.
Bending performance50 x bend cycles of 0° – 90° – 0°
Bend features5mm radius / max bending angle 90°
MaterialsSpecialized FR-4 for static flex applications
Copper weights (finished)35μm
Minimum track and gap0.075mm / 0.075mm
PCB thickness1.00mm – 2.00mm
PCB thickness in flex section0.25mm ± 0.05mm
Maxmimum dimensions538mm x 610mm
Surface finishes availableHASL (SnPb), LF HASL (SnNiCu), OSP, ENIG, Immersion tin, Immersion silver, Electrolytic gold, Gold fingers
Minimum mechanical drill0.20mm

What is the difference between semi-flex and rigid flex?

Semi-flex is effectively a ‘standard’ multilayer PCB, built using specific types of FR4 that has been depth to a specific tolerance so that the resulting thinner area provides a flexible / bending section of the traditionally rigid FR4. Semi-flex is suitable for static applications (flex to install), or with very limited number of bends.

Download our design guidelines for Semi-Flex PCBs

To prevent getting it wrong from the start, we have put together our design guidelines, to use as a checklist.