Semiconductor device and oscillation suppressing device

A semiconductor device comprising:

• a first semiconductor element and a second semiconductor element connected in series;
• a first SiC diode element connected in parallel to the first semiconductor element;
• and
• a first oscillation suppressing circuit connected in parallel to the first semiconductor element and the first SiC diode element, the first oscillation suppressing circuit suppressing voltage fluctuation caused in the first SiC diode element in response to turn-ons of the second semiconductor element;
• a second SiC diode element connected in parallel to the second semiconductor element;
• a housing for housing the first semiconductor element, the second semiconductor element, the first SiC diode element, and the second SiC diode element, the housing comprising:
• a first terminal housing section housing a first terminal to be connected to a fist external terminal, the first terminal being connected to the first semiconductor element at opposite side from the second semiconductor element, the first terminal housing section protruding from a main body part of the housing;
• and
• a second terminal housing section housing a second terminal to be connected to a second external terminal, the second terminal being connected between the first semiconductor element and the second semiconductor element or the second terminal being connected to the second semiconductor element at opposite side from the first semiconductor element, the second terminal housing section protruding from the main body part of the housing;
• wherein the first oscillation suppressing circuit includes a resistor and a capacitor connected in series and wherein at least one of the resistor and the capacitor is resilient,
• wherein the first oscillation suppressing circuit includes an additional substrate to be attached to the housing from the outside of the housing, the additional substrate being formed of a non-conductive material,
• wherein the additional substrate is fixed to the first terminal housing section and the second terminal housing section, and
• wherein the additional substrate includes a first portion substrate and a second portion substrate separated from each other, and wherein the first oscillation suppressing circuit includes a resistor and a capacitor connected in series, at least one of the resistor and the capacitor being resilient and being provided to straddle between the first portion substrate and the second portion substrate.