This part is a kind of semiconductor called 2SA1905.

Function of this product has Silicon PNP Epitaxial Type Transistor.

Manufacturers : Toshiba Semiconductor

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Some of the text within the PDF file :

TOSHIBA Transistor Silicon PNP Epitaxial Type (PCT Process) 2SA1905 High-Current Switching Applications. 2SA1905 Unit: mm • Low collector saturation voltage: VCE (sat) = −0.4 V (max) • High speed switching time: tstg = 1.0 μs (typ.) • Complementary to 2SC5076 Absolute Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Collector-base voltage VCBO −60 V Collector-emitter voltage VCEO −50 V Emitter-base voltage VEBO −5 V Collector current IC −5 A Base current IB −1 A Collector power dissipation PC 1.3 W Junction temperature Storage temperature range Tj 150 °C Tstg −55 to 150 °C JEDEC ― Note: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in JEITA TOSHIBA [ ... ]

2SA1905 PDF Datasheet Download