This part is a kind of semiconductor called B1588.

Function of this product has 2SB1588.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

(7 0 Ω ) E Darlington sAbsolute maximum ratings Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SB1588 –160 –150 –5 –10 –1 80(Tc=25°C) 150 –55 to +150 (Ta=25°C) Unit V V V A A W °C °C 2SB1588 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=–7A IC=–7A, IB=–7mA IC=–7A, IB=–7mA VCE=–12V, IE=2A VCB=–10V, f=1MHz 2SB1588 –100max –100max –150min 5000min∗ –2.5max –3.0max 50typ 230typ V V pF 16.2 B Equivalent circuit C Silicon PNP Epitaxial Planar Transistor (Complement to type 2SD2439) Application : Audio, Series Regulator and General Purpose (Ta=25°C) Unit External Dimensions FM100(TO3PF) 0.8±0.2 15.6±0.2 5.5±0.2 3.45 ±0.2 5.5 ø3.3±0.2 1.6 µA V 9.5±0.2 [ ... ]

B1588 PDF Datasheet Download