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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俟先范2367三极管的封装有那些? -
师昂眨13227724522 ______ 三极管的封装有:TO-92 TO-92S TO-92NL TO-126 TO-251 TO-252 TO-263 TO-220 TO-3 SOT-23 SOT143 SOT-25 SOT-26 SOT-50 SOT223
俟先范2367什么是三极管 -
师昂眨13227724522 ______ 三极管简介 晶体三极管的结构和类型 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结把正块半导体分成三部分,中间部分是基区,两侧...
俟先范2367三极管怎么连接电路啊,有正负极之分吗 -
师昂眨13227724522 ______ 三极管 半导体电子器件,有两个PN结组成,可以对电流起放大作用,有3个引脚,分别为集电极(c),基极(b),发射极(e).有PNP和NPN型两种,以材料分有硅材料和锗材料两种.------------------------------------------------------------------1.概念:...
俟先范2367什么是晶体三极管? -
师昂眨13227724522 ______ 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结把正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...
俟先范2367什么叫三极管?
师昂眨13227724522 ______ 三极管是指一种电子元器件,一般有三只脚,三个脚分别由基极(b),集电极(c)发射极(e)组成,有放大和开关的作用.
俟先范2367什么是三极管?它的作用是什么? -
师昂眨13227724522 ______ 三极管简介 晶体三极管的结构和类型 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结把正块半导体分成三部分,中间部分是基区,两侧...
俟先范2367三极管的作用,与判断好坏 -
师昂眨13227724522 ______ 半导体电子器件,有两个PN结组成,可以对电流起放大作用,有3个引脚,晶体三极管分别为集电极(c),基极(b),发射极(e),电子三极管分别为屏极、栅极、阴极.有PNP和NPN型两种,以材料分有硅材料和锗材料两种.[编辑本段]概...
俟先范2367三极管有什么用? -
师昂眨13227724522 ______ 三极管的结构和类型 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结把正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...
俟先范2367什么是三极管有什么用途, -
师昂眨13227724522 ______ 1.概念: 半导体三极管也称双极型晶体管,晶体三极管,简称三极管,是一种电流控制电流的半导体器件. 作用:把微弱信号放大成辐值较大的电信号, 也用作无触点开关. 2.三极管的分类: a.按材质分: 硅管、锗管 b.按结构分: NPN 、 PNP c...
俟先范2367如何判定三极管的好坏 -
师昂眨13227724522 ______ 测量三极管的好坏,以NPN型为例,将基极b开路,测量c、e极间的电阻万用表红笔接发射极,黑笔接集电极,若阻值较高(几十千欧以上),则说明穿透电流较小,管子能正常工作.若c、e极间电阻小,则穿透电流大,受温度影响大,工作不稳定.在技术指标要求高的电路中不能用这种管子.若测得阻值近似为O,表明管子已被击穿,若阻值为无穷大,则说明管子内部已断路.