This part is a kind of semiconductor called C3591.

Function of this product has 2SC3591.

Manufacturers : Sanyo

Image and pinout :

Some of the text within the PDF file :

Ordering number:EN1609D Features · Fast switching speed. · Low saturation voltage. · Adoption of MBIT process. NPN Epitaxial Planar Silicon Transistor 2SC3591 High-Definition CRT Display Horizontal Deflection Output Applications Package Dimensions unit:mm 2010C [2SC3591] Specifications JEDEC : TO-220AB EIAJ : SC46 1 : Base 2 : Collector 3 : Emitter Absolute Maximum Ratings at Ta = 25˚C Parameter Collector-to-Base Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collector Current (Pulse) Base Current Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC ICP IB PC Tj Tstg Tc=25˚C Conditions Ratings 400 200 6 7 12 4 50 150 –55 to +150 Unit V V V A A A W ˚C ˚C Electrical Characteristics at Ta = 25˚C Paramete [ ... ]

C3591 PDF Datasheet Download