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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