This part is a kind of semiconductor called A817.

Function of this product has 2SA817.

Manufacturers : Toshiba

Image and pinout :

Some of the text within the PDF file :

TOSHIBA Transistor Silicon PNP Epitaxial Type (PCT process) 2SA817 2SA817 Audio Frequency Amplifier Applications Unit: mm · Complementary to 2SC1627. · Suitable for driver of 20~25 watts audio amplifiers. Maximum Ratings (Ta = 25°C) Characteristics Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector power dissipation Junction temperature Storage temperature range Symbol VCBO VCEO VEBO IC IB PC Tj Tstg Rating -80 -80 -5 -300 -60 600 150 -55~150 Unit V V V mA mA mW °C °C Electrical Characteristics (Ta = 25°C) JEDEC TO-92 JEITA SC-43 TOSHIBA 2-5F1B Weight: 0.21 g (typ.) Characteristics Symbol Test Condition Collector cut-off current Emitter cut-off current Collector-emitter breakdown voltage DC current gain [ ... ]

A817 PDF Datasheet Download