The BC154 is a transistor used as a current amplifier in semiconductor devices. It has a PNP configuration with a maximum Collector to Base voltage of -80V, Collector to Emitter voltage of -50V, and a maximum Emitter to Base Voltage of -5V. It has a maximum current gain of 220 at a Collector current of 0.3mA, and a power gain of 4.3dB at a Collector resistance of 3K O. The BC154 is typically used in low power applications such as data buffering and low power switching circuits.