供应INFINEO三极管BF2040R BB555 1W363 1W362 1W402 1W379
| 价 格： | 面议 | |
| 型号/规格： | 1W397 1W801 LRB521S-30 LRB520S-30 LISS400 LMBT5551 LMBT5401 L8050HQ L8550 HQ(1.5 | |
| 品牌/商标： | LRC | |
| 封装形式： | SMD | |
| 环保类别： | 无铅环保型 | |
| 安装方式： | 贴片式 | |
| 包装方式： | 盒带编带包装 |
三极管的基本结构是两个反向连结的PN结面，如图1所示，可有pnp和npn
两种组合。三个接出来的端点依序称为发射极（emitter,E）、基极（base,B）和集电极（collector,C），名称来源和它们在三极管操作时的功能有关。图中也显示出
npn与pnp三极管的电路符号，发射极特别被标出，箭号所指的极为n型半导体， 和二极体的符号一致。在没接外加偏压时，两个pn接面都会形成耗尽区，将中性的p型区和n型区隔开。
dzsc/18/9254/18925459.jpg
pnp和npn三极管的结构及其示意图
三极管的电特性和两个pn结面的偏压有关，工作区间也依偏压方式来分类，这里我们先讨论最常用的所谓”正向活性区”（forward active），在此区EB极间的pn接
面维持在正向偏压，而BC极间的pn接面则在反向偏压，通常用作放大器的三极管
都以此方式偏压。图2(a）为一pnp三极管在此偏压区的示意图。EB接面的空乏区由于正向偏压会变窄，载体看到的位障变小，射极的空穴会注入到基极，基极的电子也会注入到射极；而BC接面的耗尽区则会变
dzsc/18/9254/18925459.jpg
宽，载体看到的位障变大，
故本身是不导通的。图2(b）画的是没外加偏压，和偏压在正向活性区两种情形下，空穴和电子的电位能的分布图。三极管和两个反向相接的pn二极管有什么差别呢？其间的不同部分就在于三极管的两个接面相当接近。以上述之偏压在正向活性区之pnp三极管为例，
射极的空穴注入基极的n型中性区，马上被多数载体电子包围遮蔽，然后朝集电极方向扩散，同时也被电子复合。当没有被复合的空穴到达BC接面的耗尽区时，会被此区内的电场加速扫入集电极，空穴在集电极中为多数载体，很快藉由漂移电流到达连结外部的欧姆接点，形成集电极电流IC。IC的大小和BC间反向偏压的大小
关系不大。基极外部仅需提供与注入空穴复合部分的电子流IBrec，与由基极注入 射极的电子流InBE（这部分是三极管作用不需要的部分）。InB E在射极与与电
洞复合，即InB E=IErec。pnp三极管在正向活性区时主要的电流种类可以清楚地 在图3(a）中看出。
dzsc/18/9254/18925459.jpg
3(a)
射极注入基极的空穴流大小是由EB接面间的正向偏压大小来控制，和二极体的情形类似，在启动电压附近，微小的偏压变化，即可造成很大的注入电流变化。更的说，三极管是利用VEB（或VBE）的变化来控制IC，而且提供之IB远比IC小。npn三极管的操作原理和pnp三极管是一样的，只是偏压方向，电流方
向均相反，电子和空穴的角色互易。pnp三极管是利用VEB控制由射极经基极，入射到集电极的空穴，而npn三极管则是利用VBE控制由射极经基极、入射到集电极的电子。三极管在数字电路中的用途其实就是开关，利用电信号使三极管在正向活性区（或饱和区）与截止区间切换，就开关而言，对应开与关的状态，就数字电路而言则代表0与1（或1与0）两个二进位数字。若三极管一直维持偏压在正向活性区，在发射极与基极间微小的电信号（可以是电压或电流）变化，会造成射极与集电极间电流相对上很大的变化，故可用作信号放大器。
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以上型号 为现货库存 ，如有需求 请来电 0755-83041767 13510940754
- 所属城市：广东 深圳
- [联系时请说明来自维库仪器仪表网]
- 联系人： 柯菱
- 电话：0755-83041767/83372015/82716726
- 传真：0755-82716726
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供应TDK电容C3216Y5V1A107Z C3216Y5V0J107M C3216Y5V1A107M
信息内容：主要以贴片电容、电阻、钽电容、磁珠、电感、铝电解电容、贴片二、三极管等为业务核心。主要代理进口品牌：MURATA村田、YAGEO国巨、TAIYO YUDEN太阳诱电、TDK、KYOCERA京瓷、SAMSUNG三星、ROHM罗姆、AVX、KEMET基美、NEC等。产品广泛用于电源（军品）、多媒体、通信、电力、医疗器械、仪器仪表等行业。。主要以贴片电容、电阻、钽电容、磁珠、电感、铝电解电容、贴片二、三极管等为业务核心。主要代理进口品牌：MURATA村田、YAGEO国巨、TAIYO YUDEN太阳诱电、TDK、KYOCERA京瓷、SAMSUNG三星、ROHM罗姆、AVX、KEMET基美、NEC等。产品广泛用于电源（军品）、多媒体、通信、电力、医疗器械、仪器仪表等行业。。 AT24C02-10TI-2.7 BLM15AG102AN1D BLM15AG102SN1D BLM15AG221SN1D BLM15AG601SH1D BLM15AG700SN1D BLM15BB050SN1D BLM15BB100SN1D ...
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