Patent ID: 8884432

Claim:
An interconnection substrate, comprising: a plurality of electrically conductive elements of at least one wiring layer defining first and second lateral directions; electrically conductive projections for bonding to electrically conductive contacts of at least one component external to the interconnection substrate, the conductive projections extending from the conductive elements above the at least one wiring layer, the conductive projections having end portions remote from the conductive elements and neck portions between the conductive elements and the end portions, the end portions having lower surfaces extending outwardly from the neck portions in at least one of the lateral directions, each of the conductive projections having an edge where the end portion and the lower surface of each of the projections meet; and a dielectric layer overlying the conductive elements and extending upwardly along the neck portions at least to the lower surfaces, at least portions of the dielectric layer between the conductive projections being recessed below a height of the lower surfaces, the dielectric layer having edge surfaces meeting the edges of the end portions and extending primarily in a downward direction directly from the edges of the end portions, wherein the recessed portions have surfaces extending away from the edge surfaces of the dielectric layer.