This part is a kind of semiconductor called BD911.

Function of this product has COMPLEMENTARY SILICON POWER TRANSISTORS.

Manufacturers : STMicroelectronics

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Some of the text within the PDF file :

® BD909/911 BD910/912 COMPLEMENTARY SILICON POWER TRANSISTORS s STMicroelectronics PREFERRED SALESTYPES DESCRIPTION The BD909 and BD911 are silicon Epitaxial-Base NPN power transistors mounted in Jedec TO-220 plastic package. They are intented for use in power linear and switching applications. The complementary PNP types are BD910 and BD912 respectively. TO-220 3 1 2 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter NPN PNP V CBO V CEO VEBO I E ,IC IB P tot Ts tg Tj Collector-Base Voltage (IE = 0) Collector-Emitter Voltage (IB = 0) Emitter-Base Voltage (I C = 0) Collector Current Base Current T otal Dissipation at Tc ≤ 25 C Storage Temperature o Value BD909 BD910 80 80 5 15 5 90 -65 to 150 150 BD911 BD912 100 100 Un it V V V A A W o o C C Max. Operating J [ ... ]

BD911 PDF Datasheet Download