本发明之目的在于提供一种以较少之电压损失、电力损失进行整流，组装步骤简便，且低成本之半导体设备、和使用其之发电机及电力变换设备。 本发明之半导体设备包含：第1外部电极，其具有圆形之外周部；MOSFET芯片；控制电路芯片，其系输入MOSFET之汲极电极与源极电极之电压，并基于该电压将控制MOSFET之信号供给于闸极电极；第2外部电极，其系相对于MOSFET芯片配置于第1外部电极之相反侧，且于第1外部电极之圆形外周部之中心轴上具有外部端子；及绝缘基板，其系将控制电路芯片与外部电极绝缘；且第1外部电极、MOSFET芯片之汲极电极及源极电极、第2外部电极系以于中心轴方向堆栈之方式配置，MOSFET芯片之汲极电极与第1外部电极连接，MOSFET芯片之源极电极与第2外部电极连接。

This semiconductor device is provided with: a first external electrode that has a circular periphery; a MOSFET chip; a control circuit chip that receives input of voltages of the drain electrode and source electrode of the MOSFET and supplies a signal for controlling the MOSFET to the gate electrode thereof on the basis of the voltages; a second external electrode that is disposed on the opposite side of the MOSFET chip from the first external electrode and has an external terminal on the central axis of the circular periphery of the first external electrode; and an insulating substrate for insulation between the control circuit chip and the external electrode. The first external electrode, the drain electrode and source electrode of the MOSFET chip, and the second external electrode are arranged so as to overlap in the direction of the central axis, the drain electrode of the MOSFET chip and the first external electrode are connected together, and the source electrode of the MOSFET chip and the second external electrode are connected together.