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。
![](https://p0.ssl.img.360kuai.com/t01e3b71dde3e2a2add.jpg?size=573x457)
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。
![](https://p0.ssl.img.360kuai.com/t01edfef6ec62c934b9.jpg?size=723x699)
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