초록 ▼

An interposer structure permits a differential transverse displacement of contact pads on opposite sides of the interposer to reduce thermal stresses when the interposer is bonded to contact pads of a chip and a substrate with different thermal coefficients of expansion. The effective elasticity of

An interposer structure permits a differential transverse displacement of contact pads on opposite sides of the interposer to reduce thermal stresses when the interposer is bonded to contact pads of a chip and a substrate with different thermal coefficients of expansion. The effective elasticity of the interposer between top and bottom contact pads of the interposer is facilitated by perforations which define flap-like regions. A flexible trace couples top contact pads to bottom contact pads through a via while permitting substantial transverse relative displacement of the top and bottom contact pads in flap-like regions.

대표청구항 ▼

[ What is claimed is:] [1.] An interposer to electrically couple contact pads of a chip and a substrate bonded on opposite sides of the interposer, comprising:a substantially planar dielectric film having first and second opposing surfaces;a first electrical contact pad disposed on the first surface

[ What is claimed is:] [1.] An interposer to electrically couple contact pads of a chip and a substrate bonded on opposite sides of the interposer, comprising:a substantially planar dielectric film having first and second opposing surfaces;a first electrical contact pad disposed on the first surface of the film;a second electrical contact pad disposed on the second surface of the film and laterally spaced apart from said first electrical contact pad;a conductive via disposed in said film having a first end proximate the first surface and a second end proximate the second surface, the first end of said via electrically coupled to said first contact pad and the second end of said via electrically coupled to said second contact pad by a flexible conductive trace disposed on the second surface of the film; anda plurality of cavities disposed in said film, said cavities arranged to increase the effective elasticity of the interposer between said first and said second contact pads;wherein a flexible region is formed between said first and second contact pads to enable transverse displacement of said first electrical contact pad relative to said second electrical contact pad.