Two sides Flex PCBs

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Two sides Flex PCBs

Two Sides Flexible Circuits: 
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The double-sided flexible PCB consists of bilateral flexible copper-clad materials with coverlay openings on one or both sides. It has two conductive trace layers (usually copper), separated by an insulating layer (typically polyimide), and they are electronically connected via plated through holes (PTH), though sometimes PTH may be absent for specific purposes.


The polyimide coverlay is pre-cut before lamination, allowing access to the trace pad and gold fingers from both sides. Flexible oil can also protect the traces.


Compared to single-sided FPC and dual-access FPC, it enables more complex designs, higher wiring density, and space savings with components on both sides.


In smart watches, it achieves complex functions in a small space and ensures stability. In automotive systems, it provides reliable connections in various positions.


However, its production is complex, needing precise equipment and control, leading to high costs. But with technology advancing and demand growing, its applications will expand.


Double-sided Flexible PCB: The Cornerstone of Innovative Circuits


The double-sided flexible PCB is composed of unique bilateral materials with coverlay openings. It has two copper conductive layers separated by a polyimide insulating layer and is connected via PTH or for special reasons, without.


The pre-cut polyimide coverlay ensures access, and flexible oil protects. It allows for more complex designs, higher density, and efficient space use.


For instance, in medical equipment, it offers compact and reliable solutions. In industrial automation, it ensures stable signal transmission.


Though its manufacturing requires high precision and control, increasing costs, with technology and demand, it will play a crucial role in more fields.
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Double Sides Flexible Circuits & Circuitries
Double Sided Flexible Circuit Stack Up / Structure

As double sided FPC is the most popular type of flexible circuit, so there’re various combination of different material. There’re five basic layers, from top to bottom (didn’t list the adhesive between): 

  1. Coverlay (top)
  2. Copper trace (top)
  3. Polyimide: between two copper trace
  4. Copper trace (bottom)
  5. Coverlay (bottom)

Here is the most popular stack up /layer up of double layer flexible circuits:
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Adhesiveless laminate also available and in fact, it’s very popular, as engineer want thinner thickness, bigger bend radius, chemical and high temperature, low outgassing, dimensional stability, more flexibility, longer life cycles, and impedance control and so on.

Double Sides Flex Printed Circuit Board Samples

Here are pictures of double sided flexible circuit produced by us.

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 Contact to see more photos of double-sided flexible printed circuit. manufactured by us in China, to see how it can be used in various application.

Capability of Double Side Flexible Circuit:

Copper thickness: 1/3OZ, 1/2OZ, 1OZ, 2OZ, 3OZ, 4OZ
Polymide thickness (in base material): 1/2mil, 1mil, 2mil, 3mil, 4mil
Board thickness: 0.10mm ~ 0.44mm
Maximum Dimension: 220*1,500mm
Min PTH: 0.10mm
Min LW/LS: 2mil/2mil (0.5OZ)
Impedance control: Most popular values are 50 ohm, 90 ohm, 100 ohm, other values also available

Manufacturing Process of Double-Sided Flex Circuit

Here is a simple manufacturing process of double-sided flex circuits, welcome to visit Best Technology factory in China, to see the real manufacturing process of flex circuit, then you will know better how to make 2 layers flex circuit, to see how We transfer your circuit board layout into real flex circuit.


Manufacturing Process of Double-Sided Flex Circuit 

Please contact us today for more information or any inquiry for double-sided flexible circuit board.


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