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什么是开关二极管?
开关二极管适用于开关高达100 mA的小信号，用作整流器。相反，整流二极管用于交流线路整流（从交流电到直流电）。开关二极管专门用于处理低于几十伏的电压。那些采用小型表面贴装封装的器件被广泛使用。
开关二极管是pn结二极管的一种，亦称为小信号二极管。pn结二极管的应用包括整流。用于电源整流的二极管需要高耐压（200 V至1000 V）和大额定电流（0.5 A或更高）。相反，开关二极管专门用于低压逻辑。因此，开关二极管提供80 V至200 V的低耐压和0.15 A至0.5 A的小额定电流。因此，可减小开关二极管的结面积，从而实现低电容和短反向恢复时间*。
开关二极管广泛用于各种应用的电子元件，包括开关、瞬态电压抑制器、二极管逻辑、电压钳位电路和电压检测电路。
图1显示了东芝的二极管分类，包括开关二极管。
*不保证某些开关二极管的反向恢复时间
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