This part is a kind of semiconductor called 2SB1258.

Function of this product has Silicon PNP Epitaxial Planar Transistor(Driver for Solenoid/ Relay and Motor and General Purpose).

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

(3 k Ω)(1 0 0 Ω) E Darlington sAbsolute maximum ratings (Ta=25°C) Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SB1258 –100 –100 –6 –6(Pulse–10) –1 30(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C 2SB1258 sElectrical Characteristics Symbol ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB Conditions VCB=–100V VEB=–6V IC=–10mA VCE=–2V, IC=–3A IC=–3A, IB=–6mA IC=–3A, IB=–6mA VCE=–12V, IE=0.2A VCB=–10V, f=1MHz 2SB1258 –10max –10max –100min 1000min –1.5max –2max 100typ 100typ V V MHz pF 13.0min B Equivalent circuit C Silicon PNP Epitaxial Planar Transistor (Complement to type 2SD1785) Application : Driver for Solenoid, Relay and Motor and General Purpose (Ta=25°C) Unit External Dimensions FM20(TO220F) 4.0±0.2 10.1±0.2 4.2±0.2 2.8 c0.5 [ ... ]

2SB1258 PDF Datasheet Download