This part is a kind of semiconductor called 2SD313.

Function of this product has NPN EPITAXIAL SILICON TRANSISTOR(LOW FREQUENCY POWER AMPLIFIER).

Manufacturers : Wing Shing Computer Components

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Some of the text within the PDF file :

2SD313 NPN EPITAXIAL SILICON TRANSISTOR LOW FREQUENCY POWER AMPLIFIER ! Complement to 2SB507 TO-220 ABSOLUTE MAXIMUM RATINGS (TA=25oC) Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base voltage Collector Current (DC) Collector Dissipation (Tc=25oC) Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg Rating 60 60 7 3 30 150 -50~150 Unit V V V A W C C o o ELECTRICAL CHARACTERISTICS (TA=25oC) Characteristic Collector Cutoff Current Emitter Cutoff Current DC Current Gain Collector- Emitter Saturation Voltage Current Gain Bandwidth Product Symbol ICBO IEBO hFE1 VCE(sat) fT Test Condition VCB= 60V , IE=0 VEB= 7V , IC=0 VCE= 2V , IC=1A IC=2A , IB=0.2A VCE= 5V , IC=0.5A Min Typ Max 100 100 320 1.0 8 Unit µA µA 40 V MHZ Wing Shing [ ... ]

2SD313 PDF Datasheet Download