Patent ID: 7221042

Claim:
A plastic cavity package comprising: a. a base member, the base member consisting essentially of a first metal, and having a thickness, b. a plastic housing attached to a portion of the base member, leaving attachment regions on the base member exposed, the plastic housing comprising an integral plastic body with four sides and a bottom thereby forming a plastic cavity, where the bottom of the plastic cavity has an opening in the center exposing a die-attach region of the base member, c. a semiconductor die attached to the die-attach region of the base member, the invention characterized in that the die-attach region of the base member comprises a metal insert extending through the thickness of the base member, the metal insert constructed of a second metal, and having a thickness of approximately the thickness of the base member, wherein the thermal conductivity of the second metal is substantially greater than the thermal conductivity of the first metal, and the strength of the first metal is substantially greater than the strength of the second metal.