This part is a kind of semiconductor called C5103.
Function of this product has 2SC5103.
Manufacturers : ROHM Electronics
Image and pinout :
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2SC5103 Transistors High speed switching transistor (60V, 5A) 2SC5103 !Features 1) Low VCE(sat) (Typ. 0.15V at IC / IB = 3 / 0.15A) 2) High speed switching (tf : Typ. 0.1 µs at IC = 3A) 3) Wide SOA. (safe operating area) 4) Complements the 2SA1952. !External dimensions (Units : mm) 0.75 5.5 1.5 (3) (2) (1) 2.3 0.9 0.9 0.65 2.3 5.1 6.5 C0.5 1.0 0.5 0.5 1.5 2.5 9.5 !Absolute maximum ratings (Ta=25°C) Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector power dissipation Junction temperature Storage temperature ∗ Single pulse Pw=100ms ROHM : CPT3 EIAJ : SC-63 Unit V V V A(DC) A(Pulse) ∗ W W(Tc=25°C) °C °C Symbol VCBO VCEO VEBO IC PC Tj Tstg Limits 100 60 5 5 10 1 10 150 −55~+150 !Packagin [ ... ]