The collector currents Ic, Ice, and Ie have the following meanings: Ic is the limit value, which refers to the collector current, and C represents the collector. The specific meaning of Ic is the maximum DC current of the collector. Iceo, ICES, and ICER are called transistor collector reverse current. Their names and meanings are as follows: When the emitter is open and a reverse voltage is applied between the collector and the base, the reverse current of the collector is usually called the reverse current. towards saturation current. Ie represents the current at the emission extreme. In addition, the transistor has three ports, E emitter, B base and C collector, and I represents the current, IE represents the current at the emitter terminal, IB represents the current at the base terminal, and IC represents the current at the collector terminal.