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双极结型晶体管（BJT）有哪些应用？
近年来，MOSFET的使用比双极结型晶体管（BJT）更频繁。 这是因为MOSFET通常不需要驱动电流并且易于操作。然而，BJT用于放大器、振荡器、低电压开关等。
这是因为BJT具有更高的增益（hFE）*、更好的线性度、更好的1/f噪声，并且可以通过在基极和发射极之间施加约0.7 V的电压来导通。 此外，由于BJT具有高抗静电（ESD）能力，因此有时会在干扰较大的环境中使用。
使用BJT的示例电路如下所示。
*hFE随集电极-发射极电压而变化，具体取决于外部电路。
关于hFE的说明，另见常见问题（FAQ）：“双极晶体管（BJT）的基极电流和集电极电流之间有什么关系？”
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