This part is a kind of semiconductor called 2SD2017.

Function of this product has Silicon NPN Triple Diffused 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 :

Darlington 2SD2017 sElectrical Characteristics Symbol ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB Conditions VCB=300V VEB=20V IC=25mA VCE=2V, IC=2A IC=2A, IB=2mA IC=2A, IB=2mA VCE=12V, IE=–1A VCB=10V, f=1MHz 2SD2017 100max 10max 250min 2000min 1.5max 2.0max 20typ 65typ V V MHz pF 13.0min Equivalent circuit B C ( 4k Ω ) E Silicon NPN Triple Diffused Planar Transistor sAbsolute maximum ratings (Ta=25°C) Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SD2017 300 250 20 6 1 35(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C 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 µA V 16.9±0.3 8.4±0.2 mA 1.35±0.15 1.35±0.15 0.85 +0.2 -0.1 0.45 +0.2 -0.1 2.54 2.2±0.2 2.4±0 [ ... ]

2SD2017 PDF Datasheet Download