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为了减小电路体积、减少焊接点数目、提高可靠性和降低成本,国外开发了一种将基极电阻R_B和基极一发射极电阻R_(BE)与三极管芯片组装在一起的片状三极管。它们主要用在开关电路、变换器电路和计算机电路之中。这种片状三极管的等效电路和外形结构如图29所示。各种技术性能的最大标称值、共同电性能和电阻值等分别见表27、表28和表29所示。
In order to reduce the circuit volume, reduce the number of welding points, improve the reliability and reduce the cost, a chip transistor with a base resistor R_B and a base-emitter resistor R_ (BE) assembled with the triode chip has been developed. They are mainly used in switching circuits, inverter circuits and computer circuits. The equivalent circuit and outline of this chip transistor are shown in Figure 29. The maximum nominal values, common electrical properties, and resistance values for various technical properties are shown in Table 27, Table 28, and Table 29, respectively.