Patent ID: 7615873

Claim:
A substrate having at least one conductive mounting pad on which at least one die is mountable by soldering, said mounting pad having at least one solder flow stop around at least a portion of its periphery and being relatively closely spaced from the periphery of said mounting pad; wherein said substrate comprises a dielectric layer formed on a base layer and a circuit layer formed on said dielectric layer, a portion of said circuit layer comprising said at least one conductive mounting pad, and wherein said flow stop includes an upper surface level with an upper surface of said circuit layer, wherein said conductive mounting pad is comprised of a first metallic body and said solder flow stop is comprised of a second metallic body different from said first metallic body and non-wetting, during a solder reflow process, to a solder which is usable for mounting the at least one die on said at least one conductive mounting pad.