二极管常见的封装类型，DO-15、DO-27、SOD-323、SOD-723等，相信大家都很熟悉。
图源：百度百科
封装指的是安装半导体集成电路芯片用的外壳。对于电子元器件来说，封装是非常有必要的。
一方面，封装不仅起着安装、固定、密封、保护芯片及增强电热性能等方面的作用，而且还通过芯片上的接点用导线连接到封装外壳的引脚上，这些引脚又通过印刷电路板上的导线与其他器件相连接，从而实现内部芯片与外部电路的连接。因为芯片必须与外界隔离，以防止空气中的杂质对芯片电路的腐蚀而造成电气性能下降。
另一方面，按统一规格封装后的芯片，也更便于安装和运输。
细心的电子工程师会发现，电子元器件有着不同的封装类型，不同类的元器件外形虽然差不多，但内部结构及用途却大不同，譬如TO220封装的元件可能是三极管、可控硅、场效应管甚至是双二极管。TO-3封装的元器件有三极管，集成电路等。
今天我们就来盘点一下常见的二极管、三极管、MOS封装类型，下图含精确尺寸。
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权伯雯4515三极管.是什么? -
敖是汤18644404817 ______ 三极管有两类 1、真空三极管 他有阳极、阴极与栅极组成的真空电子管,因为有三个极,故名三极管,是早期的电压控制型器件.过去的电子管收音机、收发报机、电台都会用到.目前由于晶体三极管的出现而淡出. 2、晶体三极管 他有集电...
权伯雯4515三极管原理及应用 -
敖是汤18644404817 ______ 原理:三极管,全称应为半导体三极管,也称双极型晶体管、晶体三极管,是一种控制电流的半导体器件·其作用是把微弱信号放大成幅度值较大的电信号, 也用作无触点开关.晶体三极管,是半导体基本元器件之一,具有电流放大作用,是电子电路的核心元件.三极管是在一块半导体基片上制作两个相距很近的PN结,两个PN结把整块半导体分成三部分,中间部分是基区,两侧部分是发射区和集电区,排列方式有PNP和NPN两种. 应用:1.用在放大电路,作电压或电流放大. 2.用在振荡电路中,调制、解调或自激振荡. 3.用在开关电路中,作闸流、限流或开关管.
权伯雯4515三极管三极管…
敖是汤18644404817 ______ 你好,我用通俗易懂的话来说三极管的作用吧:一般情况下三级管在电子线路里面可以做放大器原件使用、做开关管电路使用、做电子振荡器使用.它的工作原理是:三级管的基极一旦有比较小的电流变化,在它的集电极会跟随发生很大的电流变动.这是因为三极管有着很大的放大倍数,把基极的小变化放大啦. 请你参考
权伯雯4515如何判定三极管的三个极? -
敖是汤18644404817 ______ 老师傅以图例的方式教你:快速区分三极管的三个极! Error loading player: No Flash Player, please install
权伯雯4515三极管.怎么区分E极.B极.C极.还有什么 NPN PNP 看书看得头晕,也不能理解.请简单易懂. -
敖是汤18644404817 ______[答案] 三极管的基极对另外两个极是两个PN结,用RX1K欧姆档测, 指针表的黑表笔接一个脚,红笔分别测另两个脚,测得两个都是正向导通时,黑笔接的就是NPN型三极管的基极. 指针表的红表笔接一个脚,黑笔分别测另两个脚,测得两个都是正向导通...
权伯雯4515三极管工作原理 -
敖是汤18644404817 ______ 当发射极和集电极之间的电压处于在放大区内时,较小的基极电流的变化引起集电极电流成比例的较大变化,这就是三极管最基本的作用——电流放大作用,三极管其他的作用都是由此而来.
权伯雯4515三极管分类
敖是汤18644404817 ______ 三极管可分为两大类:晶体三极管和电子三极管,每大类又分为很多小类,如:电子三极管又分遥截止三极管和锐截止三极管;晶体三极管又分为结型晶体三极管、场型晶体三极管和沟道型晶体三极管等等;根据用途、参数不同,每小类又分为很多种.具体小的种类有几千种吧,这里没办法细说啦.
权伯雯4515电路图中怎样看三极管的基极,集电极和发射极. -
敖是汤18644404817 ______ 首先你要理解理想电压源的内阻等于0的概念,也就是正负极性实质上是短路的 三极管有任何一个引脚连接到电源的正负端,就叫做共xxxx极放大电路.比如射极跟随器,虽然是叫射极跟随器,但是确实集电极接电源正极的,所以是共集电极放大电路.当然这个短路有的时候说的是交流短路,比如共基极电路就是三极管的基极接一个电容到地,也就交流对电源短路了.所以叫共基极放大电路.这些概念对于一个初学者来说确实有些难了.但是原理上确实就是这样说的 其实还有一个比较傻瓜的办法,就是你看信号的输入输出,信号是从基极进入.集电极输出,那剩下的那个没用的电极.就是那种电极的放大电路,所以是共发射极放大电路.明白了吗?希望你能听懂
权伯雯4515怎样最简单的去理解三极管呢~!
敖是汤18644404817 ______ 相当于水龙头,进水口相当于集电极,手柄相当于基极,出水口相当于发射极,你用手拧水管相当于给基极加电压,你扭的力气越大,发射极的水就流出的快,那么水就像电压电流,而你扭力相当于加给基极的电压.在你扭水管的初始时候就相当于饱和状态,也就是扭动了手柄,但没出水.
权伯雯4515三极管的正偏和反偏是什么意思?看书没有看懂~ -
敖是汤18644404817 ______[答案] 正偏就是正向偏置,其实三极管的构造是PN结,二极管的构造也是PN结,二极管P接高点位,N接点位的时候会正向导同,三极管里就叫正偏.