This part is a kind of semiconductor called 2SC5374.
Function of this product has NPN Epitaxial Planar Silicon Transistor.
Manufacturers : Sanyo Semicon Device
Image and pinout :

Some of the text within the PDF file :
Ordering number:EN5535A NPN Epitaxial Planar Silicon Transistor 2SC5374 VHF to UHF Band OSC, High-Frequency Amplifiers Applications Features · High gain : S21e2=10.5dB typ (f=1GHz). · High cutoff frequency : fT=5.2GHz typ. Package Dimensions unit:mm 2106A [2SC5374] 0.3 0.75 0.6 0 to 0.1 0.4 0.8 0.4 1.6 0.1max 0.5 0.5 1.6 Specifications Absolute Maximum Ratings at Ta = 25˚C Parameter Collector-to-Base Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg Electrical Characteristics at Ta = 25˚C Conditions Parameter Collector Cutoff Current Emitter Cutoff Current DC Current Gain Gain-Bandwidth Product Output Capacitance Reverse Transfer Capacitanc [ ... ]
2SC5374 PDF Datasheet Download
