This part is a kind of semiconductor called BDX34B.

Function of this product has Power Linear and Switching Applications.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BDX34/A/B/C BDX34/A/B/C Power Linear and Switching Applications • High Gain General Purpose • Power Darlington TR • Complement to BDX33/33A/33B/33C respectively 1 TO-220 2.Collector 3.Emitter 1.Base PNP Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO Parameter Collector-Base Voltage : BDX34 : BDX34A : BDX34B : BDX34C VCEO Collector-Emitter Voltage : BDX34 : BDX34A : BDX34B : BDX34C Collector Current (DC) *Collector Current (Pulse) Base Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature - 45 - 60 - 80 - 100 - 45 - 60 - 80 - 100 - 10 - 15 - 0.25 70 150 - 65 ~ 150 V V V V V V V V A A A W °C °C Value Units IC ICP IB PC TJ TSTG ©2000 Fairchild Semiconductor International Rev. A, February 2000 BDX34 [ ... ]

BDX34B PDF Datasheet Download