Flexible circuit boards

Flexible circuit board

Because of the advantages (for example, cost, space, and weight savings) that flexible and Rigid-Flex-circuit boards have for some projects, they are used ever more frequently. Multi-CB can produce your flexible circuit boards with the highest quality, either as prototype or as series with 1-10 layers.

The standard surface used is chemical gold (ENIG), the contours are formed according to requirements, preferably using laser cutting, or also with mechanical milling.

You should discuss the selected materials and design for the construction and layout of flexible circuit boards with us in the planning phase; we can assist you to work out the optimum solution!

Please contact our CAM-Station-Team (tel. +49-8104-6280) for additional technical questions about flexible circuit boards. Please mind also our Design-Aid for flexible circuit boards.
PCB-Calculator: Flexible PCBs

Technical options for flexible circuit boards

Options Notes
OptionsDesign 1 to 10 layers, plated-throughNotesLayer buildup
OptionsConductor width min. 100µm Notes 
OptionsAnnular ring min. 100µm Notes 
OptionsVia min. Ø 150µm Notes 
OptionsSurfaces Chemical gold (recommended), immersion tin, HAL lead-freeNotesSurfaces
OptionsMaterials Polyimide, high Tg polyimideNotesMaterials
OptionsMaterial thickness starting at 25µm foil plus copperNotes 
OptionsCopper thickness from 18µmNotes 
OptionsStiffener 0,025µm - 3,20mmNotes 
OptionsMax. size 250mm x 450mmNoteslarger on request
OptionsCover Coverlay or flexible solder-stopNotes 
OptionsCover bridge Coverlay: ≥ 200µmNotes 
Options  Flex. solder-stop: ≥ 100µmNotes 
OptionsImpedance control Yes (10% tolerance)Notes 
OptionsAdhesive tape 3M 9077NotesMaterials

Material for flexible circuit boards

UL certification for flexible circuit boards

At Multi-CB, you also get one-sided and multilayer flexible printed circuit boards with UL certification.

Flexible Circuit Board Microsection

2 Layer Flex-PCB (PTH) Microsection

Example - Stiffener

Flexible circuit board with ZIF connector 250µm

ZIF connector, picture by courtesy of Molex

You can order your flexible circuit boards with a stiffener. The available thicknesses are: 0,075mm - 3,20mm.

Popular are the thicknesses0,30mmand0,20mm, e.g. forZIF connectors.

Polyimid-Stiffener: 0,025mm - 0,225mm

FR4-Stiffener: 0,075mm - 3,20mm

In the Flex PCB calculator the final thickness (incl. stiffener) is given.