SMT元器件别名无管脚元器件或旋片元器件。习惯性上大家把SMT无源元件,如旋片电阻器、电容器、电感器又称为SMC(Surface Mounted Components),而将有源器件,如小外观设计电子管SOT及平扁建立(QFP)称为SMD(Surface Mounted Devices)。不论是SMC或是SMD,在功用上都和传统式的通孔安裝元器件同样。最初是为了更好地减小容积而生产制造,殊不知,他们一经面世,就体现出强劲的活力,其容积显著更减小、高频率特性提升、耐震动、安裝紧密等特点是传统式通孔元器件所无可比拟的,进而很大地影响了电子设备向多用途、性能卓越、小型化、成本低的角度发展趋势
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