Patent ID: 7649270

Claim:
A collective substrate made of ceramic, the collective substrate being formed integrally of a plurality of insulative members that are arranged in spaced relation in the same plane of the substrate and each has opposite surfaces which respectively serve as a main surface for mounting a semiconductor element and an external connection surface for connecting to a second-component, comprising: a through-hole formed at least one of a predetermined position within respective regions defined as the insulative members; a position across a boundary between each region and a region outside the region, as extending thicknesswise of the insulative member, wherein the through-hole has a single minimum size hole portion located at the position thicknesswise of the insulative member, and an interior surface tapered such that an opening size progressively decreases from openings of the through-hole in the main surface and in the external connection surface toward the minimum size hole portion; a semiconductor element mounting electrode layer provided on the main surface of each of the regions defined as the insulative members; a second-component connection electrode layer provided on the external connection surface of each of the regions defined as the insulative members; and an electrically conductive layer provided in the through-hole for connecting the semiconductor element mounting electrode layer and the corresponding second-component connection electrode layer.