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.

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 0,075mm - 3,20mmNotes 
OptionsMax. size 250mm x 450mmNoteslarger on request
OptionsSolder-stop Coverlay or flexible solder-stopNotes 
OptionsSolder-stop bridge Coverlay: ≥ 200µmNotes 
Options  Flex. solder-stop: ≥ 100µmNotes 
OptionsImpedance control Yes (10% tolerance)Notes 

Material for flexible circuit boards

Material for flexible PCBs PCB recommended operating temperatureRecommended operating temperature PCB CTE-zCTE-z PCB dielectric constantεr PCB electric strenghtElectric strenght PCB surface resistivitySurface resistivity PCB tracking resistanceCTI PCB Td260Td260 PCB Td288Td288 PCB Td valueTd-Wert PCB peel strengthPeel strength
Material for flexible PCBs PCB recommended operating temperatureRecommended operating temperature°CPCB CTE-zCTE-zppm/°CPCB dielectric constantεr@1MHzPCB electric strenghtElectric strenghtKV/mmPCB surface resistivitySurface resistivityPCB tracking resistanceCTIVPCB Td260Td260minPCB Td288Td288minPCB Td valueTd-Wert°CPCB peel strengthPeel strengthN/mm
Material for flexible PCBsDuPont Pyralux AP
Polyimid material
PCB recommended operating temperatureRecommended operating temperature105°PCB CTE-zCTE-z25PCB dielectric constantεr3,40PCB electric strenghtElectric strenght150PCB surface resistivitySurface resistivity-PCB tracking resistanceCTI-PCB Td260Td26060PCB Td288Td288-PCB Td valueTd-Wert-PCB peel strengthPeel strength1,8
Material for flexible PCBsDuPont Pyralux FR
Coverlay
PCB recommended operating temperatureRecommended operating temperature105°PCB CTE-zCTE-z-PCB dielectric constantεr3,40PCB electric strenghtElectric strenght126PCB surface resistivitySurface resistivity1 x 10^7PCB tracking resistanceCTI-PCB Td260Td260-PCB Td288Td288-PCB Td valueTd-Wert-PCB peel strengthPeel strength1,6
Material for flexible PCBsDuPont Pyralux LF
Adhesive
PCB recommended operating temperatureRecommended operating temperature105°PCB CTE-zCTE-z-PCB dielectric constantεr3,20PCB electric strenghtElectric strenght120PCB surface resistivitySurface resistivity1 x 10^7PCB tracking resistanceCTI-PCB Td260Td260-PCB Td288Td288-PCB Td valueTd-Wert-PCB peel strengthPeel strength-
Material for flexible PCBsARLON 85N
Polyimid High-Tg
PCB recommended operating temperatureRecommended operating temperature210°PCB CTE-zCTE-z55PCB dielectric constantεr4,20PCB electric strenghtElectric strenght126PCB surface resistivitySurface resistivity1,6 x 10^6PCB tracking resistanceCTI-PCB Td260Td26060PCB Td288Td28860PCB Td valueTd-Wert-PCB peel strengthPeel strength1,2

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 thicknesses 0,030mm and 0,025mm, e.g. for ZIF connectors.

Polyimid-Stiffener: 0,050mm - 0,225mm

FR4-Stiffener: 0,30mm - 3,20mm