This part is a kind of semiconductor called B1559.
Function of this product has 2SB1559.
Manufacturers : Sanken Electric
Image and pinout :
Some of the text within the PDF file :
(7 0 Ω ) E Darlington sAbsolute maximum ratings (Ta=25°C) Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SB1559 –160 –150 –5 –8 –1 80(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C 2SB1559 sElectrical Characteristics Symbol ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB Conditions VCB=–160V VEB=–5V IC=–30mA VCE=–4V, IC=–6A IC=–6A, IB=–6mA IC=–6A, IB=–6mA VCE=–12V, IE=1A VCB=–10V, f=1MHz 2SB1559 –100max –100max –150min 5000min∗ –2.5max –3.0max 65typ 160typ V V MHz pF 20.0min 4.0max 3 B Equivalent circuit C Silicon PNP Epitaxial Planar Transistor (Complement to type 2SD2389) Application : Audio, Series Regulator and General Purpose (Ta=25°C) Unit 5.0±0.2 External Dimensions MT-100(TO3P) 15.6±0.4 9.6 2.0 1.8 4.8±0.2 2.0±0.1 µA µA [ ... ]