This part is a kind of semiconductor called BD233.

Function of this product has Medium Power Linear and Switching Applications.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

BD233/235/237 BD233/235/237 Medium Power Linear and Switching Applications • Complement to BD 234/236/238 respectively 1 TO-126 2.Collector 3.Base 1. Emitter NPN Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO Parameter Collector-Base Voltage : BD233 : BD235 : BD237 : BD233 : BD235 : BD237 : BD233 : BD235 : BD237 Value 45 60 100 45 60 80 45 60 100 5 2 6 25 150 - 65 ~ 150 Units V V V V V V V V V V A A W °C °C VCEO Collector-Emitter Voltage VCER Collector-Emitter Voltage VEBO IC ICP PC TJ TSTG Emitter-Base Voltage Collector Current (DC) *Collector Current (Pulse) Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature Electrical Characteristics TC=25°C unless otherwise noted Symbol VCEO(sus) Parameter * Coll [ ... ]

BD233 PDF Datasheet Download