This part is a kind of semiconductor called 2SD2439.

Function of this product has Silicon NPN Triple Diffused Planar Transistor(Audio/ Series Regulator and General Purpose).

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

Equivalent circuit C Darlington 2SD2439 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 2SD2439 100max 100max 150min 5000min∗ 2.5max 3.0max 55typ 95typ V V MHz pF 16.2 B (7 0 Ω ) E Silicon NPN Triple Diffused Planar Transistor (Complement to type 2SB1588) sAbsolute maximum ratings (Ta=25°C) Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SD2439 160 150 5 10 1 80(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C 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 µA 23.0±0.3 a b 1.75 2.15 1.05 5.45±0.1 1.5 [ ... ]

2SD2439 PDF Datasheet Download