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我们专业采购电子材料、回收电容器材料、回收三极管材料，回收IC集成电路/存储器/显卡/网卡/声卡/计算机芯片/闪存/存储器/二极管三极管/电解电容器/光电IC/接收管/晶体振荡器/等电子元器件。它包括电子元件，如制造商和公司的积压库存，转换和清关。
二极管是用半导体材料(硅、硒、锗等)制成的一种电子器件。它具有单向导电性能，即给二极管阳极和阴极加上正向电压时，二极管导通。当给阳极和阴极加上反向电压时，二极管截止。因此，二极管的导通和截止，则相当于开关的接通与断开。二极管是早诞生的半导体器件之一，其应用非常广泛。
二极管就是由一个PN结加上相应的电极引线及管壳封装而成的。采用不同的掺杂工艺，通过扩散作用，将P型半导体与N型半导体制作在同一块半导体(通常是硅或锗)基片上，在它们的交界面就形成空间电荷区称为PN结。由P区引出的电极称为阳极，N区引出的电极称为阴极。因为PN结的单向导电性，二极管导通时电流方向是由阳极通过管子内部流向阴极。
二极管有两个电极，由P区引出的电极是正极，又叫阳极;由N区引出的电极是负极，又叫阴极。三角箭头方向表示正向电流的方向，二极管的文字符号用VD表示。
二极管的种类很多，分辨正负极的方法也不尽相同。以下小编列举了几种二极管正负极的判断方法，仅供参考。
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NCV4279D1
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NCV8502D100
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NCV8502D50
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LM2931AZ-5.0
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