Flexible PCB

Flexible PCBs are generally installed bent, folded, or twisted. They are primarily used to replace wiring, connectors, and antennas, then gradually to be the Flex-rigid PCBs laminated with rigid PCBs, now widely used throughout the electronics industry.
FC becomes a prototype-to-production Flex and rigid-flex PCB supplier in response to market requirements. With its growing stronger core HDI technology in combination with flexible printed circuit boards, FC also provides high-density interconnect (HDI) Rigid-flex PCBs.

Flexible PCB Markets Served

Medical -diagnostic hardware, medical electronics and medical imaging devices
Telecommunications -high frequency chip carriers and fiber-optical communication products
Industrial & Commercial -robotics, consumer electronics, UAVs, connectors and LED lighting applications
Automotive -camera modules, lighting and other automotive electronics

FC Flexible PCB Display

FC Capabilities of Flexible PCB

ItemStandard FPCHDI Flex PCBRigid-flex PCB
Panel Size250*400mm100*100mm250*400mm
Line Width/Space.003” (0.076mm).00075” (19μm).003” (0.076mm)
Copper Thickness1/2oz – higher1/4 to 1/2oz1/2 oz – higher
Layer Count10 layer18 layer4 layer
(to date)(to date)(to date)
Via / Drill Dia.
Min Drill (Mechanical) Hole Dia..008” (0.2mm).006” (0.15mm).008” (0.2mm)
Min Via (Laser) Dia.5mil (0.13mm)3mil (0.076mm)6mil (0.15mm)
Min Micro-via (Laser) Dia.3mil (0.076mm)3mil (0.076mm)3mil (0.076mm)
Stiffener MaterialPI / FR4 / MetalPI / FR4 / MetalFR4 / PI
Shielding MaterialCopperCopperCopper
Silver InkSilver InkSilver Ink
Tooling Tolerance2mil (.051mm)2mil (.051mm)2mil (.051mm)
Zif Tolerance2mil (.051mm)1mil (.025mm)2mil (.051mm)
Solder Mask
Solder Mask Bridge Between Dam5mil (0.13mm)4mil (0.10mm)5mil (0.13mm)
Solder Mask Registration Tolerance4mil (0.10mm)4mil (0.10mm)5mil (0.13mm)
Coverlay Registration8mil (0.20mm)5mil (0.13mm)8mil (0.20mm)
PIC Registration7mil (0.18mm)4mil (0.10mm)7mil (0.18mm)
Solder Mask Registration5mil (0.13mm)4mil (0.10mm)5mil (0.13mm)
Polyimide (PI) Stiffener Registration
Stiffener Registration10mil (0.25mm)10mil (0.25mm)10mil (0.25mm)
Thickness Tolerance10%10%10%
FR4 Stiffener
Stiffener Registration10mil (0.25mm)10mil (0.25mm)Layer to Layer
Thickness Tolerance10%10%5mil
Silkscreen /Legend
Min Height35mil (0.89mm)25mil (0.64mm)35mil (0.89mm)
Min Width8mil (0.20mm)6mil (0.15mm)8mil (0.20mm)
Min Space8mil (0.20mm)6mil (0.15mm)8mil (0.20mm)
Registration+/-5mil (0.13mm)+/-5mil (0.13mm)+/-5mil (0.13mm)
SRD (Steel Rule Die)
Outline Tolerance5mil (0.13mm)2mil (.051mm)5mil (0.13mm)
Min Radius5mil (0.13mm)4mil (0.10mm)5mil (0.13mm)
Inside Radius20mil (0.51mm)10mil (0.25mm)31mil (0.79mm)
Min Punching Hole Dia.40mil (1.02mm)31.5mil (0.80mm)N/A
Pucnhing Hole Dia. Tolerance+/-2mil (0.05mm)+/-1mil (0.03mm)N/A
Slot Width20mil (0.51mm)15mil (0.38mm)31mil (0.79mm)
Tolerance of Hole To Outline+/-3mil (0.076mm)+/-2mil (0.05mm)+/-4mil (0.10mm)
Tolerance of Hole Edge To Outline+/-4mil (0.10mm)+/-3mil (0.076mm)+/-5mil (0.13mm)
Min Size of Trace To Outline8mil (0.20mm)5mil (0.13mm)10mil (0.25mm)

The materials of Flexible PCB at FC

The quality of the flex circuit board will be determined by the raw material of the flex circuit board and the stacking method. There are five basic raw materials for FC flexible circuit boards:
Polyimide (Kapton)
Most popular, high temp rating, excellent chemical resistance
Polyester (PET)
Lower cost, moderately high temp rating
high durability, thermal properties and cost-benefit ratio
Fluoropolymers (PTFE)
Superior chemical resistance, relatively expensive
Liquid Crystal Polymer (LCP)
High frequency ,low signal loss


FC Offer Different Types of FPC

  • Single-Sided FPC: Flexible circuit boards have only one metal conductor layer and are bonded to one side of the dielectric layer or bonded between two dielectric layers.
  • Double-Sided FPC: Double-sided FPC has metal layers on both sides of a single layer of dielectric. It connects with plated through holes and offers enhanced power-handling capabilities and circuit density.
  • Multi-Layer FPC: Multilayer FPC combines three or more metal layers that are separated by layers of dielectrics.
  • Rigid-Flex PCB: A rigid-flex PCB incorporates a network of rigid circuit boards that typically house components, with flexible substrates that connect them.

The advantage of Flexible PCB

Flexible printed circuit boards are printed circuits made of flexible insulating substrates, with many advantages that rigid printed circuit boards do not have:

Short assembly time

All lines are configured. Eliminate redundant wiring connection work

Lighter weight than hard PCBs

Can reduce the weight of the final product

Smaller size than hard PCB

Can effectively reduce the size of the product. Increase the convenience of carrying

Thinner than rigid PCBs

Can improve flexibility. Strengthen the limited space for three-dimensional assembly

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