Patent ID: 7235844

Claim:
A semiconductor device including a power device portion having a power device formed therein and a control circuit portion having a control circuit formed therein, the power device portion and the control circuit portion being disposed on a surface layer portion of one silicon substrate, characterized in that: the power device portion and the control circuit portion are wire-connected by first wires formed of aluminum or aluminum alloy disposed on the silicon substrate so as to perform desired control; silicon nitride film serving as insulating film for coating and protecting the first wires on the silicon substrate is formed so as to be opened at the power device portion so that each of an input and an output can collect current on the first wires and also opened at at least a portion for taking out the input/output of the control circuit at the control circuit portion; current collecting electrodes that are formed of thick-film copper electrodes connected to the first wires at the lower side through a first barrier layer and each of the current collecting electrodes has a structure that the upper surface and whole side surface thereof are coated with aluminum film or aluminum alloy film through a second barrier layer are arranged at opening portions for current collection in the power device portion; a bonding pad that is formed of a thick-film copper electrode through the first barrier layer and has a structure that the upper surface and whole side surface thereof are coated with aluminum film or aluminum alloy film through a second barrier layer is disposed on the silicon nitride film in the control circuit portion; in order to take out the input/output of the control circuit, wires for connecting the first wires to the bonding pad are constructed through the opening formed in the silicon nitride film by second wires that are achieved by laminating the four layers of the first barrier layer, a thin copper wire layer, the second barrier layer and the aluminum film or aluminum alloy film; and thick polyimide resin film serving as a protection film for coating and protecting the uppermost surface of the silicon substrate is formed so as to be opened at only portions needed to perform bonding connection in areas where the current collecting electrodes and the bonding pad are formed.