Patent ID: 7532475

Claim:
A semiconductor chip assembly, comprising: a semiconductor chip having a back surface extending in a first lateral direction and a second lateral direction transverse to the first lateral direction; a heat sink overlying tile back surface and spaced therefrom in a vertical direction; a first array of flexible metal cantilevers mounted in thermal communication with the back surface of the chip, the cantilevers extending in an upward direction towards the heat sink; a second array of flexible metal cantilevers mounted in thermal communication with the heat sink and extending in a downward direction towards the chip, the cantilevers of the first array being interdigitated with the cantilevers of the second array to transfer heat between the first and second arrays of cantilevers, wherein the cantilevers of the first and second arrays have first and second lengths in the vertical direction, respectively, and first, and second widths in the first and second lateral directions, respectively, each of the first and second lengths being much greater than the first and second widths, such that each cantilever can move independently relative to each other cantilever in the vertical and lateral directions to allow for relative vertical and lateral movement between the back surface of the chip and the heat sink such as due to differential thermal expansion between the chip and the heat sink.