This part is a kind of semiconductor called 2SC5551.

Function of this product has High-Frequency Medium-Output Amplifier Applications.

Manufacturers : Sanyo Semicon Device

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Some of the text within the PDF file :

Ordering number:ENN6328 NPN Epitaxial Planar Silicon Transistor 2SC5551 High-Frequency Medium-Output Amplifier Applications Features · High fT : (fT=3.5GHz typ). · Large current : (IC=300mA). · Large allowable collector dissipation (1.3W max). Package Dimensions unit:mm 2038A [2SC5551] 4.5 1.6 1.5 0.5 3 1.5 2 3.0 0.75 1 1.0 0.4 2.5 4.25max 0.4 Specifications 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) Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC ICP PC Tj Tstg Mounted on a ceramic board (250mm2× 0.8mm) Conditions 1 : Base 2 : Collector 3 : Emitter SANYO : PCP (Bottom view) Ratings 40 30 2 300 600 1.3 150 �� [ ... ]

2SC5551 PDF Datasheet Download