Patent ID: 6953999

Claim:
A package for mounting an integrated circuit die, the package comprising: a metal substrate having first and second opposing primary surfaces and an aperture formed therebetween; and a flexible thin film interconnect structure formed over the first surface of the metal substrate and over the aperture, the flexible thin film interconnect structure having bottom and top opposing surfaces and a first region in direct contact with the first surface of the metal substrate and a second region opposite the aperture, wherein the bottom surface is in direct contact with the metal substrate in the first region of the thin film interconnect structure and wherein the thin film interconnect structure comprises: (i) a first dielectric layer formed directly on the first surface of the metal substrate and extending over the aperture; (ii) a first metalization layer formed over the first dielectric layer, the first metalization layer comprising a plurality of signal lines positioned over the first region of the thin film interconnect structure and a first plurality of bonding pads positioned over the second region of the thin film interconnect structure; and (iii) a second plurality of bonding pads on the top surface of the thin film interconnect structure; wherein the first plurality of bonding pads have a first pitch appropriate for attaching the integrated circuit die to the package and the second plurality of bonding pads have a pitch greater than the first pitch.