Semiconductor device

1. A semiconductor device comprising:

a first metal base plate having a first top surface, and a first bottom surface opposite the first top surface;

a second metal base plate having a second top surface, and a second bottom surface opposite the second top surface;

a first semiconductor chip including a first IGBT and having a first obverse surface, a first reverse surface opposite the first obverse surface, a first emitter electrode and a first gate electrode of the first IGBT formed over the first obverse surface, and a first collector electrode of the first IGBT formed over the first reverse surface;

a second semiconductor chip including a second IGBT and having a second obverse surface, a second reverse surface opposite the second obverse surface, a second emitter electrode and a second gate electrode of the second IGBT formed over the second obverse surface, and a second collector electrode of the second IGBT formed over the second reverse surface;

a third semiconductor chip including a first diode and having a third obverse surface, a third reverse surface opposite the third obverse surface, a first anode electrode of the first diode formed over the third obverse surface, and a first cathode electrode of the first diode formed over the third reverse surface;

a fourth semiconductor chip including a second diode and having a fourth obverse surface, a fourth reverse surface opposite the fourth obverse surface, a second anode electrode of the second diode formed over the fourth obverse surface, and a second cathode electrode of the second diode formed over the fourth reverse surface;

a plurality of leads electrically connected to the first, second, third, and fourth semiconductor chips, respectively;

a plurality of metal conductors electrically connected to the first, second, third, and fourth semiconductor chips, respectively; and

a sealing body sealing the first, second, third, and fourth semiconductor chips, parts of the plurality of leads, and the plurality of metal conductors,

wherein the plurality of leads are projected from one lateral side of the sealing body,

wherein the first and third semiconductor chips are mounted over the first top surface of the first metal base plate such that the first reverse surface of the first semiconductor chip and the third reverse surface of the third semiconductor chip face the first top surface of the first metal base plate, and the first collector electrode of the first semiconductor chip and the first cathode electrode of the third semiconductor chip are electrically connected to each other via the first metal base plate,

wherein the second and fourth semiconductor chips are mounted over the second top surface of the second metal base plate such that the second reverse surface of the second semiconductor chip and the fourth reverse surface of the fourth semiconductor chip face the second top surface of the second metal base plate, and the second collector electrode of the second semiconductor chip and the second cathode electrode of the fourth semiconductor chip are electrically connected to each other via the second metal base plate,

wherein a first lead is electrically connected to the first emitter electrode of the first semiconductor chip and the first anode electrode of the third semiconductor chip via a first metal conductor, and electrically connected to the second collector electrode of the second semiconductor chip and the second cathode electrode of the fourth semiconductor chip,

wherein a second lead is electrically connected to the first collector electrode of the first semiconductor chip and the first cathode electrode of the third semiconductor chip,

wherein a third lead is electrically connected to the second emitter electrode of the second semiconductor chip and the second anode electrode of the fourth semiconductor chip via a second metal conductor,

wherein a fourth lead is electrically connected to the first gate electrode of the first semiconductor chip via a third metal conductor, and

wherein a fifth lead is electrically connected to the second gate electrode of the second semiconductor chip via a fourth metal conductor.

2. The semiconductor device according claim 1 ,

wherein the first lead is integrated with the second metal base plate.

3. The semiconductor device according claim 2 ,

wherein the first lead is electrically separated from the first metal base plate.

4. The semiconductor device according claim 1 ,

wherein the second lead is integrated with the first metal base plate.

5. The semiconductor device according claim 1 ,

wherein the first lead is arranged between the second and third leads.

6. The semiconductor device according claim 5 ,

wherein the second lead is arranged between the first and fourth leads, and

wherein the third lead is arranged between the first and fifth leads.

7. The semiconductor device according claim 6 ,

wherein the first and second gate electrodes are respectively disposed outside the first and second emitter electrodes.

8. The semiconductor device according claim 1 ,

wherein the first and second metal base plates are arranged side by side in a plan view, and

wherein a part of the sealing body is disposed between the first and second metal base plates.

9. The semiconductor device according claim 1 ,

wherein the third semiconductor chip is farther from the plurality of leads than the first semiconductor chip in a plan view.

10. The semiconductor device according claim 1 ,

wherein the fourth semiconductor chip is farther from the plurality of leads than the second semiconductor chip in a plan view.

11. The semiconductor device according claim 1 ,

wherein the first and second bottom surfaces of the first and second metal base plates are respectively covered with the sealing body.

12. The semiconductor device according claim 11 ,

wherein a portion of the sealing body which covers the first and second bottom surfaces of the first and second metal base plates is a portion which can attach a heat sink.

13. The semiconductor device according claim 12 ,

wherein a through-hole to fix the heat sink by a screw is formed in a part of the sealing body between the first and second metal base plates.

14. The semiconductor device according claim 1 ,

wherein parts of the first and second bottom surfaces of the first and second metal base plates are exposed from the sealing body.

15. The semiconductor device according claim 14 ,

wherein portions of the first and second bottom surfaces of the first and second metal base plates exposed from the sealing body are surfaces which can attach a heat sink.

16. The semiconductor device according claim 15 ,

wherein a through-hole to fix the heat sink by a screw is formed in a part of the sealing body between the first and second metal base plates.

17. The semiconductor device according claim 1 ,

wherein a first groove is formed on the first metal base plate such that the first groove surrounds the first and third semiconductor chips in a plan view, and

wherein a second groove is formed on the second metal base plate such that the second groove surrounds the second and fourth semiconductor chips in the plan view.

18. The semiconductor device according claim 1 ,

wherein the first and third semiconductor chips are fixed over the first top surface of the first metal base plate via conductive adhesive, and the second and fourth semiconductor chips are fixed over the second top surface of the second metal base plate via conductive adhesive.

19. The semiconductor device according claim 1 ,

wherein each width of the first and second metal conductor is wider than each width of the third and fourth metal conductor in a direction perpendicular to a direction where each metal conductor is extended in a plan view.

20. The semiconductor device according claim 19 ,

wherein the first, second, third, and fourth metal conductors are metal wires.

21. The semiconductor device according claim 19 ,

wherein the first and second metal conductors are metal straps.

22. The semiconductor device according claim 1 ,

wherein the first and second metal conductors are plural metal wires, respectively.