BSW66A is a NPN silicon planar epitaxial transistor manufactured by Philips. It is designed for use in general purpose switching and amplifier applications.Description: The BSW66A is a NPN silicon planar epitaxial transistor with a maximum collector current of 800mA. It has a maximum voltage rating of 40V and a maximum power dissipation of 1.2W.Features: Low noise High gain High current gain High frequency operation Low collector-emitter saturation voltageApplications: The BSW66A is suitable for use in general purpose switching and amplifier applications such as audio amplifiers, power supplies, and motor control circuits. It can also be used in high frequency switching applications.(For reference only)
https://www.utsource.net/itm/p/677724.html