TYPE II: Double-Sided Flex

Two conductor layers separated by laminated dielectric usually with plated through holes (PTH) vias, providing signal sequencing, ground, signal matching and high-density interconnect.

Benefits of Double-Sided Flexible Printed Circuits:

  • Wider circuit design parameters when compared to single-sided flex
  • Access to circuit traces from both sides of the flex configuration
  • Reduced assembly costs due to minimized interconnect errors
  • Dynamic flexing ability
  • Neater/cleaner system appearance
  • Reduced packaging dimensions


Double-sided flexible printed circuits offer two conductor layers separated by a dielectric, usually polyimide. Coverlayers may be used on one or both sides. Plated through holes may or may not be featured to interconnect traces on opposite sides of the dielectric. Double-sided flex provides the ability to access circuit traces from both the top and bottom sides of the circuit offering greater flexibility in design and functionality.

Properly designed and utilized, double-sided flex circuits offer the same level of dynamic flexing (repetitive movement) as do single-sided flex, providing a much wider range of application uses due to its ability to carry more complex circuit layouts.

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