Patent ID: 7547968

Claim:
A semiconductor device, comprising: a substrate having an upper surface and a lower surface opposing the upper surface; a first semiconductor component having a first main surface and a first back surface opposing the first main surface, and mounted over the upper surface of the substrate via a plurality of first bumps such that the first main surface of the first semiconductor component opposes to the upper surface of the substrate; a second semiconductor component having a second main surface and a second back surface opposing the second main surface, and mounted over the upper surface of the substrate via a plurality of second bumps such that the second main surface of the second semiconductor component opposes to the upper surface of the substrate; a first under-filling disposed between the first main surface of the first semiconductor component and the upper surface of the substrate; a second under-filling disposed between the second main surface of the second semiconductor component and the upper surface of the substrate; and a plurality of third bumps formed on the lower surface of the substrate; wherein a height of each of the plurality of second bumps is greater than that of each of the plurality of first bumps; and wherein a coefficient of thermal expansion of the second under-filling is greater than that of the first under-filling.