This part is a kind of semiconductor called BFN37.

Function of this product has SOT223 PNP SILICON PLANAR HIGH VOLTAGE TRANSISTOR.

Manufacturers : Zetex Semiconductors

Image and pinout :

Some of the text within the PDF file :

SOT223 PNP SILICON PLANAR HIGH VOLTAGE TRANSISTOR ISSUE 4 – JANUARY 1996 7 FEATURES * High VCEO and Low saturation voltages APPLICATIONS * Suitable for video output stages in TV sets * Switching power supplies COMPLEMENTARY TYPE:BFN36 PARTMARKING DETAIL:BFN37 BFN37 C E C B ABSOLUTE MAXIMUM RATINGS. PARAMETER Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Continuous Collector Current Power Dissipation at Tamb =25°C Operating and Storage Temperature Range PARAMETER Collector-Base Breakdown Voltage Collector-Emitter Breakdown Voltage Emitter-Base Breakdown Voltage Collector Cut-Off Current Emitter Cut-Off Current Collector-Emitter Saturation Voltage Base Emitter Saturation Voltage SYMBOL V(BR)CBO V(BR)CEO V(BR)EBO ICBO IEBO VCE(sat) VBE(sat) 25 [ ... ]

BFN37 PDF Datasheet Download