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High voltage fast-switching NPN power transistor Datasheet -production data Figure 1. Internal schematic diagram Features • High voltage capability • Low spread of dynamic parameters • Very high switching speed Applications • Electronic ballast for fluorescent lighting (CFL) • SMPS for battery charger Description Aug 30, 2017 · BC547 is a NPN transistor hence the collector and emitter will be left open when the base pin is held at ground and will be closed when a signal is provided to base pin. BC547 Transistor: Pinout, Diagrams, Equivalents & Datasheet