This part is a kind of semiconductor called B1420.

Function of this product has 2SB1420.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

Darlington 2SB1420 (2 k Ω) (80Ω) E B Equivalent circuit C Silicon PNP Epitaxial Planar Transistor Application : Chopper Regulator, DC Motor Driver and General Purpose sAbsolute maximum ratings Symbol 2SB1420 VCBO –120 VCEO –120 VEBO –6 IC –16(Pulse–26) IB –1 PC 80(Tc=25°C) Tj 150 Tstg –55 to +150 (Ta=25°C) Unit V V V A A W °C °C sElectrical Characteristics Symbol Conditions ICBO VCB=–120V IEBO VEB=–6V V(BR)CEO IC=–10mA hFE VCE=–4V, IC=–8A VCE(sat) IC=–8A, IB=–16mA VBE(sat) IC=–8A, IB=–16mA fT VCE=–12V, IE=1A COB VCB=–10V, f=1MHz (Ta=25°C) 2SB1420 Unit –10max –10max µA mA –120min V 2000min –1.5max V –2.5max V 50typ MHz 350typ pF sTypical Switching Characteristics (Common Emitter) VCC [ ... ]

B1420 PDF Datasheet Download