bd 303Description: isc Silicon NPN Power Transistor. 3 Results. Part #: BD303N. Datasheet: 1MbKb3P. Manufacturer: Thinki Semiconductor Co., Ltd..Description: isc Silicon NPN Power Transistor. 3 Results. Part #: BD303N. Datasheet: 1MbKb3P. Manufacturer: Thinki Semiconductor Co., Ltd..