Patent ID: 8164192

Claim:
An electrical structure comprising: a first substrate comprising a first electrically conductive pad; a second substrate comprising a second electrically conductive pad; and an interconnect structure electrically and mechanically connecting said first electrically conductive pad to said second electrically conductive pad, wherein said interconnect structure comprises a non-solder metallic core structure and a first solder structure in direct mechanical contact with a first portion of said non-solder metallic core structure, wherein said first solder structure electrically and mechanically connects said first portion of said non-solder metallic core structure to said first electrically conductive pad, wherein a second portion of said non-solder metallic core structure is thermo-compression bonded to said second electrically conductive pad, wherein said interconnect structure comprises a second solder structure, wherein said non-solder metallic core structure comprises a first non-solder metallic core comprising a spherical shape and a second non-solder metallic core comprising said spherical shape, wherein said second solder structure electrically and mechanically attaches said first non-solder metallic core to said second non-solder metallic core, wherein said first portion of said non-solder metallic core structure is located on said first non-solder metallic core, and wherein said second portion of said non-solder metallic core structure is located on said second non-solder metallic core.