BC857B is a NPN/PNP surface-mount transistor in a SOT-23-3 package manufactured by Youtai. It is RoHS compliant and suitable for use in low noise, low power switching and amplifier circuits. It has low current noise and high gain performance, as well as high collector-emitter voltage and collector current ratings. It can be used with a wide range of applications such as analog and digital circuits, computers and peripherals controls, amplifiers, regulators, and motor drivers.