BUY 2SD557 https://www.utsource.net/itm/p/998094.html
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Description: 2SD557 is a NPN silicon epitaxial transistor with high voltage and high speed switching applications. Features: High voltage: VCEO = 500 V High speed switching: tF = 0.3 μs Low collector-emitter saturation voltage: VCE(sat) = 0.3 V (max) High current gain: hFE = 30 (min) Applications: High voltage switching High speed switching Motor control Power supply circuits (For reference only)