在开关电路中,如果要进行开关的电流大于单个晶体管的收集极允许电流,则可将多个晶体管并联起来。通常如果将收集极与发射极简单地联接,由于晶体管的集一射电阻的不同,则晶体管将流过不同的收集极电流。这时,如果一个晶体管过热而致损坏,总电流将分配给其他晶体管,因而使这些晶体管也同佯的过载而致损坏。 In switching circuits, multiple transistors can be connected in parallel if the current to be switched is greater than the collector allowable current of a single transistor. Typically, if the collector and emitter are simply coupled, the transistor will flow through a different collector current due to the different emitter-emitter resistance of the transistor. At this time, if one transistor is overheated and damaged, the total current will be distributed to the other transistors, thus causing these transistors to be damaged as well.