Patent ID: 8076771

Claim:
A semiconductor device, comprising: a semiconductor chip including a principal surface and a back surface opposite to the principal surface, the principal surface having a surface electrode; and a metal cap including a flat portion and sidewall portions, the flat portion being bonded with the back surface of the semiconductor chip, the side wall portions being formed on at least two opposed sides of the flat portion and made of the same material as a material of the flat portion, wherein the flat portion includes a slit passing entirely through a thickness of the flat portion from a surface to which the semiconductor chip is bonded by a bonding material to a surface opposite thereto, the slit is formed across the semiconductor chip in a plan view and divides a bonding region between the flat portion and the semiconductor chip into a plurality of bonding regions, each of the plurality of bonding regions is a region where the flat portion is faced with the back surface of the semiconductor chip via the bonding material, and the plurality of bonding regions are separated individually to each other by the slit, and wherein the slit has a width which is equal to or larger than 1/10 of a thickness of the flat portion and equal to or smaller than ⅓ of a side length of the semiconductor chip.