Types of Flex Circuits

Below you will find information regarding the different types of flexible circuits from a single or double sided design to multi-layer technologies, including rigid flex circuit design specifications.

See our technical article for more information on flex circuit material and construction methods or see our past flex circuit technical webinar to better help you design your next flexible PCB.


Single-Layer Flex Circuit

  • IPC 6013 - Type 1
  • One conductive layer, either bonded between two insulating layers or uncovered on one side.
  • Stiffeners, pins, connectors, components, are optional.
Single-Layer Flex Circuit

Double-Sided Flex Circuit

  • IPC 6013, - Type 2
  • Two conductive layers with an insulating layer between; outer layers may have covers or exposed pads.
  • Plated through-holes provide connection between layers.
  • Stiffeners, pins, connectors, components are optional.
Double-Sided Flex Circuit

Multi-Layer Flex Circuit

  • IPC 6013 - Type 3
  • Three or more flexible conductive layers with flexible insulating layers between each one; outer layers may have covers or exposed pads.
  • Plated through-holes provide connection between layers.
  • Controlled impedance possible.
Multi-Layer Flex Circuit

Rigid-Flex Circuit

  • IPC 6013 - Type 4
  • Two or more conductive layers with either flexible or rigid insulation material as insulators between each one; outer layers may have covers or exposed pads.
  • Rigid-flex has conductors on the rigid layers, which differentiates it from multi-layer circuits with stiffeners. Plated through-holes extend through both rigid and flexible layers (with the exception of blind and buried vias). Rigid-flex costs more than a standard circuit with stiffeners.
Rigid-Flex Circuit
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