Patent ID: 8917521

Claim:
A substrate, comprising: a conductive carrier; a first metal layer formed on the conductive carrier, wherein the first metal layer comprises a lead pad and a die-attach pad, both having a first upper surface; and a second metal layer formed on the first metal layer, wherein the second metal layer comprises a bond pad and a die-attach barrier both having a second upper surface; wherein the bond pad overlaps and in contact with the first upper surface of the lead pad, the first upper surface of the lead pad is partially exposed and a part of the bond pad overhangs outward from an edge of the lead pad; wherein the die-attach barrier overlaps and in contact with the first upper surface of the die-attach pad, the die-attach barrier is formed around the die-attach pad, the first upper surface of the die-attach pad is partially exposed and a part of the die-attach barrier overhangs outward from an edge of the die-attach pad.