Patent ID: 7573128

Claim:
A semiconductor module comprising: a first semiconductor package and a second semiconductor package each comprising a semiconductor element, a wiring substrate having a wiring member connected to the semiconductor element and external terminals connected to the wiring member, and a back-surface member formed on a side of the semiconductor element opposed to another side of the semiconductor element toward the wiring substrate; and a mount substrate, on which the first semiconductor package is mounted; wherein the second semiconductor package is stacked on the first semiconductor package, wherein a first bonding layer is provided between the wiring substrate of the first semiconductor package and the back-surface member of the second semiconductor package, and wherein each back-surface member is formed of a material selected based upon a coefficient of linear expansion and a modulus of longitudinal elasticity of the material in order to minimize bending deformation and warp of the semiconductor elements, wherein a second bonding layer is provided between the back-surface member of the first semiconductor substrate and the mount substrate, and wherein each back-surface member is arranged on at least portions including corners of the back surface of an associated semiconductor element.