2SC3997 is a NPN silicon epitaxial transistor manufactured by Sanyo. It is a high-voltage, high-speed switching transistor. Description: The 2SC3997 is a NPN silicon epitaxial transistor designed for high voltage, high speed switching applications. It is suitable for use in switching power supplies, inverters, motor control, and other high voltage switching applications. Features: High breakdown voltage: VCEO = 600V High speed switching: tF = 0.2μs Low saturation voltage: VCE(sat) = 1.2V (max) Low collector-emitter capacitance: CCE = 0.5pF (typ) Low collector-base capacitance: CCB = 0.2pF (typ) Applications: Switching power supplies Inverters Motor control High voltage switching applications(For reference only)
https://www.utsource.net/itm/p/382565.html