光电二极管,又称半导体光敏二极管,是常用的光敏元器件之一。常见的光电二极管外形如图1所示,电路图形符号如图2所示。文字符号为V_D或V。光电二极管与普通二极管相比,在构造上相似之处是:管芯是一个P—N结;属非线性元件;具有单向导电性能。然而,由于光电二极管是一种光敏元件,因此又有别于普通的半导体二极管。 Photodiode, also known as semiconductor photodiode, is one of the commonly used photosensitive components. Common photodiode shape shown in Figure 1, the circuit diagram symbol shown in Figure 2. The text symbol is V_D or V. Compared with ordinary diode photodiode in the structural similarities are: the die is a P-N junction; is a non-linear element; with one-way conductivity. However, since a photodiode is a light-sensitive element, it is different from ordinary semiconductor diodes.