BUY 2SD1678 https://www.utsource.net/itm/p/1255034.html
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Description: 2SD1678 is a silicon NPN power transistor designed for use in high-voltage, high-speed switching applications. Features: High breakdown voltage High switching speed Low collector-emitter saturation voltage High collector current Applications: High-voltage switching applications Motor control Lighting control Power supplies (For reference only)