| 摘要 |
PROBLEM TO BE SOLVED: To reduce a voltage drop amount in reverse direction operation while maintaining high breakdown strength characteristic and current amplification rate. SOLUTION: An emitter region 6 has a region A which is not covered with a base region 4 to be in contact with a collector region 3 without the base region 4. Consequently, in reverse direction operation, a reflow current flows between the collector region 3 and the emitter region 6 before a pn diode between the collector region 3 and the base region 4 turns "on", thus reducing the voltage drop amount. Furthermore, when a voltage between the collector region 3 and the emitter region 6 is lower than a content potential of the pn diode between the collector region 3 and the base region 4, an electronic current which is a majority carrier flows between the collector region 3 and the emitter region 6, and thereby reverse recovery characteristic in cutoff of reverse direction operation becomes good. Loss in reverse recovery can be thereby reduced. COPYRIGHT: (C)2006,JPO&NCIPI
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