Stiffeners are materials added to a flex circuit to rigidize particular areas. Rigidizing is recommended under smt components, for example, but not required. Other areas to consider rigidizing include:

  • Hole patterns stiffener image
  • Forcing bends
  • Increasing overall thickness
  • Protecting solder joints
  • Die attach platform for wire bond components
  • Heat dissipation

TYPES OF STIFFENER MATERIALS stiffener image

FR4/G10 Stiffeners:

  • Bonded with PSA or thermal-set adhesive
  • Adds rigidity to connector area or used as carrier panel

Polyimide Stiffeners: 

  • Bonded with PSA or thermal-set adhesive
  • Used to add thickness, or add strength in high wear areas

Other materials:

  • Stainless steel
  • Aluminum
  • Ceramic

PLACING STIFFENER
Stiffener and coverlay termination points should overlap a minimum of .030” to avoid stress points.
placing stiffenerPFC can assist with the location of stiffeners, identification of the material and the required thicknesses. Contact us!

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