Patent ID: 8729680
Filing Date: 2014-05-20
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a wiring board including a first surface and a second surface opposite to the first surface; a cavity formed in the first surface; a semiconductor element mounted on a bottom surface of the cavity via an adhesive and being in close contact with a side wall of the cavity, which is near the wiring for higher frequency; and a wiring layer for a high frequency wave and another wiring layer in each of which first and second pads are defined at both ends and which are formed on the first surface around the cavity, each of the wiring layer and the another wiring layer being electrically connected to the semiconductor element through the first pad; a first protection film and a second protection film formed on the first and second surfaces of the wiring board, respectively; a heat-radiating structure which is provided in the bottom surface of the cavity, and which includes a plurality of thermal vias formed through the wiring board in a direction from the bottom surface of the cavity toward the second surface, wherein in a part of the heat-radiating structure, which is near the portion where the semiconductor element is in close contact with the side wall of the cavity, the number of the thermal vias formed per unit area is larger than in the other part of the heat-radiating structure, and the first protection film from which the wiring layer for the higher frequency wave, the first and second pads of the wiring layer for the higher frequency wave are exposed and with which the another wiring layer and the second pad of the another wiring layer are covered other than the first pad of the another wiring layer.