This part is a kind of semiconductor called A1908.

Function of this product has 2SA1908.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

2SA1908 Silicon PNP Epitaxial Planar Transistor (Complement to type 2SC5100) Application : Audio and General Purpose sAbsolute maximum ratings (Ta=25°C) Symbol 2SA1908 Unit VCBO –120 V VCEO –120 V VEBO –6 V IC –8 A IB –3 A PC 75(Tc=25°C) W Tj 150 °C Tstg –55 to +150 °C sElectrical Characteristics (Ta=25°C) Symbol Conditions 2SA1908 Unit ICBO VCB=–120V –10max µA IEBO VEB=–6V –10max µA V(BR)CEO IC=–50mA –120min V hFE VCE=–4V, IC=–3A 50min∗ VCE(sat) IC=–3A, IB=–0.3A –0.5max V fT VCE=–12V, IE=0.5A 20typ MHz COB VCB=–10V, f=1MHz 300typ pF ∗hFE Rank O(50 to 100), P(70 to 140), Y(90 to 180) sTypical Switching Characteristics (Common Emitter) VCC RL IC VBB1 VBB2 IB1 (V) (Ω) (A) (V) (V) [ ... ]

A1908 PDF Datasheet Download