Circuit board including a heat radiating plate

摘要

A circuit board is provided with a plurality of arms and a heat radiation plate. The insulating substrate of the each of the arms includes: a passive element region to which a passive element is connected; an active element region to which an active element is connected; and a wiring region on which wiring lines of the element group are laid. In the each of the arms, the passive element region, the active element region and the wiring region align in a lengthwise direction of the insulating substrate, and the passive element region and the wiring region are arranged on both sides of the active element region which is located centrally.