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三極管

三極管的結構和類型

發布日期：2022-10-09 點擊率：55

　按PN結的組合方式分為NPN型和PNP型，它們的結構示意圖和電路符號分別如圖所示。

　　不管是什么樣的三極管，它們均包含三個區：發射區、基區、集電區，同時相應的引出三個電極：發射極（用E或e表示，Emitter）、基極（用B或b表示，base）和集電極（用C或c表示，Collector）。同時又在兩兩交界面形成PN結，分別是發射結和集電結。
　　在電路符號中，發射極的箭頭代表發射結正向偏置時發射極電流的實際方向。

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