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Types of Flex Circuit Boards

Depending on the application, designers use four varieties of flex circuits:

Single-Sided Flex Circuits Boards

Single-sided PCB or single-layer flexible circuits are the most basic type of flexible circuits. They consist of a flexible dielectric film laminated to a single sheet of copper. The copper layer is then chemically etched according to the specified circuit pattern design. Polyimide coverlays can be added to the circuit board for additional insulation and protection, if desired.

 FeaturesApplication

Single-Sided features include:

  • Very thing construction
  • 1 conductor layer
  • Supported and unsupported finger areas

Single-Sided Flex can be used in:

  • Dynamic flexing applications
  • Unusual folding and forming applications
  • Installation / service applications / repair
  • Limitations on space / thickness
  • Installation / service flexing

Double-Sided Flex Circuit Board

Double-sided PCB have two conductive layers – one on each side of the base layer. The two conductive layers have an insulating layer between. Trace patterns can be created on both sided of the substrate film and can be connected withe copper plated through-holes (PTH). The plated through holes make electrical connections between the two layers.


Features Application

Double-Sided features include:

  • Component assembly is available on both sides
  • 2 conductor layers
  • Fingers are an integral part of the conductor patterns

Double-Sided Flex can be used in:

  • Ground and power plan applications
  • Dense surface mount assembly
  • Shielding applications
  • LCD module for mobile phones
  • Digital cameras
  • Optical pick-up for AV and computers

Multilayer Flex PCB

Rigid-Flex in particular offers the designer opportunities to conform to mechanical restrictions of an existing system. It solves part of the Form Factor and Fit, enabling the designer to meet the function of the overall design and /or retrofit in existing designs. Rigid-flex construction allows for use of many variables while meeting the needs for signal processing and predictable values for impedance, mechanical configuration, cost, and reliability. 

Features Application
Multi-layer features include:

  • Three or more flexible conductive layers with flexible insulating layers in between
  • Connections provided with plated through-holes
Multi-layer Flex can be used in:
  • Optical Pick-Up for A/V Equipment and Computers
  • When there are a larger number of signals
  • For signal integrity
  • If stiffeners and components need to be added
  • Applications such as cameras, battery packs, cell phones, fuel pumps and more

Rigid-Flex PCB

Rigid-Flex in particular offers the designer opportunities to conform to mechanical restrictions of an existing system. It solves part of the Form Factor and Fit, enabling the designer to meet the function of the overall design and /or retrofit in existing designs. Rigid-flex construction allows for use of many variables while meeting the needs for signal processing and predictable values for impedance, mechanical configuration, cost, and reliability. 

 
Features Application
Rigid-flex PCBs feature:
  • Extremely complex configurations
  • Controlled Impedance
  • Reduced interconnections
Rigid-flex circuit boards can be used in:
  • Applications such as cameras, battery packs, cell phones, fuel pumps and more
  • Optical pick-up for AV and computers

Address

Royal Circuits,
21 Hamilton Ct,Hollister, CA 95023

Email: sales@royalcircuits.com

Phone: 1-831-636-7789

Royal Circuits South
15505 Cornet St., Santa Fe Springs, CA 90680

1-562-404-0626

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