This part is a kind of semiconductor called BFN37.

Function of this product has PNP Silicon High-Voltage Transistors (Suitable for video output stages in TV sets and switching power supplies High breakdown voltage).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

PNP Silicon High-Voltage Transistors BFN 37 BFN 39 Suitable for video output stages in TV sets and switching power supplies q High breakdown voltage q Low collector-emitter saturation voltage q Complementary types: BFN 36, BFN 38 (NPN) q Type BFN 37 BFN 39 Marking BFN 37 BFN 39 Ordering Code (tape and reel) Q62702-F1304 Q62702-F1305 Pin Configuration 1 2 3 4 B C E C Package1) SOT-223 Maximum Ratings Parameter Collector-emitter voltage Collector-base voltage Emitter-base voltage Collector current Peak collector current Base current Peak base current Total power dissipation, TS = 124 ˚C Junction temperature Storage temperature range Thermal Resistance Junction - ambient2) Junction - soldering point Rth JA Rth JS ≤ ≤ Symbol VCE0 VCB0 VEB0 IC ICM IB IBM Ptot Tj Tstg Values BFN 3 [ ... ]

BFN37 PDF Datasheet Download