佛山回收傳感器收購(gòu)鉭電容
芯創(chuàng)天科電子回收電子呆料、剩料、尾料、尾貨、回收倒閉電子廠呆滯料、電子元器件、IC、芯片、二極管三極管、集成電路、繼電器、藍(lán)牙芯片、主控芯片、單片機(jī)、濾波器、電子元件回收！免費(fèi)上門(mén)服務(wù)，現(xiàn)金結(jié)算，合理出價(jià)，信譽(yù)保證
我們專(zhuān)業(yè)采購(gòu)電子材料、回收電容器材料、回收三極管材料，回收IC集成電路/存儲(chǔ)器/顯卡/網(wǎng)卡/聲卡/計(jì)算機(jī)芯片/閃存/存儲(chǔ)器/二極管三極管/電解電容器/光電IC/接收管/晶體振蕩器/等電子元器件。它包括電子元件，如制造商和公司的積壓庫(kù)存，轉(zhuǎn)換和清關(guān)。
二極管是用半導(dǎo)體材料(硅、硒、鍺等)制成的一種電子器件。它具有單向?qū)щ娦阅?，即給二極管陽(yáng)極和陰極加上正向電壓時(shí)，二極管導(dǎo)通。當(dāng)給陽(yáng)極和陰極加上反向電壓時(shí)，二極管截止。因此，二極管的導(dǎo)通和截止，則相當(dāng)于開(kāi)關(guān)的接通與斷開(kāi)。二極管是最早誕生的半導(dǎo)體器件之一，其應(yīng)用非常廣泛。
二極管就是由一個(gè)PN結(jié)加上相應(yīng)的電極引線及管殼封裝而成的。采用不同的摻雜工藝，通過(guò)擴(kuò)散作用，將P型半導(dǎo)體與N型半導(dǎo)體制作在同一塊半導(dǎo)體(通常是硅或鍺)基片上，在它們的交界面就形成空間電荷區(qū)稱(chēng)為PN結(jié)。由P區(qū)引出的電極稱(chēng)為陽(yáng)極，N區(qū)引出的電極稱(chēng)為陰極。因?yàn)镻N結(jié)的單向?qū)щ娦?，二極管導(dǎo)通時(shí)電流方向是由陽(yáng)極通過(guò)管子內(nèi)部流向陰極。
二極管有兩個(gè)電極，由P區(qū)引出的電極是正極，又叫陽(yáng)極;由N區(qū)引出的電極是負(fù)極，又叫陰極。三角箭頭方向表示正向電流的方向，二極管的文字符號(hào)用VD表示。
二極管的種類(lèi)很多，分辨正負(fù)極的方法也不盡相同。以下小編列舉了幾種二極管正負(fù)極的判斷方法，僅供參考。
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