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国产硅光敏二极管按衬底材料导电类型的不同，可分为 2cu 与 2du 两种类型。 2CU 型以 N-Si 为衬底，而 2DU 型则以 P-Si 为衬底。 2CU 型光敏二极管只有二个引出线，而 2DU 型光敏二极管则有三个引出线，因为除了前级和后级以外，还设有一个环极。

2CU型硅光电二极管是用N型硅单晶制作的，这种类型的光电二极管多用带透镜窗口的金属管壳封装，下端有正、负两个电极引线，它们分别与管心中的光敏面（P型层）和N型衬底相连。 光线从窗口射入后经透镜聚焦在管心上，由于这种聚光作用增强了光照强度，从而可以产生较大的光电流。 2DU型硅光电二极管是用P型硅单晶制作的，2DU型硅光电二极管目前多采用陶瓷树脂封装，入射光的窗口不带透镜。 这类管子引线共有三条，分别称作前极、后极、环极.

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2014年11月24日 · 国产的光敏二极管中最常用约有2cu型、2du型、hpd型。 进口的有夏普SPD型、SBC型、BS型、PD型等。 如何区分光敏二极管的正极、负极

2011年4月6日 · 2DU型硅光电二极管是用P型硅单晶制作的，从外形上分有2DUA，2DUB等类型，其中2DUA型管子体积较小些（见图1（b））。 2DU型硅光电二极管目前多采用陶瓷树脂封装，入射光的窗口不带透镜。 这类管子引线共有三条，分别称作前极、后极、环极（见图1（b））。 前极即光敏区（N型区）的引线；后极为衬底（P型区）的引线；环极是为了减小光电管的暗电流和提高管子的稳定性而设计的另一电极。 光电管的暗电流是指光电二极管在无光照、最高工作 …