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由于双极晶体管本质上是两个二极管,因此双极晶体管可用作二极管。然而,由于双极晶体管并非专门用作二极管,将其用作二极管可能会导致电流和其它额定值方面的问题。例如,通常晶体管的基极电流小于所需集电极电流的十分之一。因此,基极端子附近的器件(例如,片内导线和键合线)专门用于此用途,并有相应规定的额定电流(见表1)。此外,尽管基极-发射极和基极-集电极二极管外形看似相同,但双极晶体管的发射极和集电极区域内的掺杂浓度却截然不同(对于npn晶体管,nc << ne)。因此,这两种二极管实质上大不相同。
以下是在温度补偿电路中将相同晶体管用作二极管使用的一个示例。即使是在这种情况下,也要确保在数据表中指定的额定值内使用晶体管。在典型的二极管应用中使用专用二极管,而不是双极晶体管。