This part is a kind of semiconductor called 2SA1020.

Function of this product has TO-92MOD Plastic-Encapsulated Transistors.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

Transys Electronics L I M I T E D TO-92MOD Plastic-Encapsulated Transistors 2SA1020 FEATURES Power dissipation PCM : 900 mW (Tamb=25℃) TRANSISTOR (PNP) TO-92MOD 1. EMITTER 2. COLLECTOR 3. BASE Collector current : -2 A ICM Collector-base voltage V V(BR)CBO : -50 Operating and storage junction temperature range TJ, Tstg: -55℃ to +150℃ ELECTRICAL CHARACTERISTICS (Tamb=25℃ Parameter Collector-base breakdown voltage Collector-emitter breakdown voltage Emitter-base breakdown voltage Collector cut-off current Emitter cut-off current DC current gain Collector-emitter saturation voltage Base-emitter saturation voltage Transition frequency Symbol V(BR)CBO V(BR)CEO V(BR)EBO ICBO IEBO hFE(1) VCE(sat) VBE(sat) 123 unless otherwise specified) Test conditions MIN TYP MAX UNIT V V V Ic=-100 [ ... ]

2SA1020 PDF Datasheet Download