Patent ID: 7546681

Claim:
A method of making a microelectronic element comprising: making a connection component, comprising: providing a metal layer having a top surface and a bottom surface; providing a dielectric layer over the top surface of said metal layer; forming openings in said dielectric layer to expose portions of the top surface of said metal layer; providing conductive elements atop said dielectric layer, at least some of said conductive elements extending through the openings in said dielectric layer and being in contact with said metal layer; plating first conductive protrusions atop the at least some of said conductive elements extending through the openings in said dielectric layer, wherein said first conductive protrusions extend away from said metal layer and are exposed above a top surface of said dielectric layer; and selectively removing portions of said metal layer from the bottom surface of said metal layer to form second conductive protrusions that extend away from said first conductive protrusions, wherein at least some of said first and second conductive protrusions are electrically interconnected with one another.