This part is a kind of semiconductor called BC558A.

Function of this product has (BC556 - BC558) PNP Silicon Planar Epitaxial Transistors.

Manufacturers : CDIL

Image and pinout :

Some of the text within the PDF file :

Continental Device India Limited An IS/ISO 9002 and IECQ Certified Manufacturer IS/ISO 9002 PNP SILICON PLANAR EPITAXIAL TRANSISTORS BC556, A, B, C BC557, A, B, C BC558, A, B, C TO-92 Plastic Package General Purpose Transistors ABSOLUTE MAXIMUM RATINGS(Ta=25 deg C unless otherwise specified) DESCRIPTION Collector Emitter Voltage Collector Emitter Voltage Collector Base Voltage Emitter Base Voltage Collector Current Continuous Peak Base Current - Peak Emitter Current - Peak Collector Power Dissipation Ta =25 deg C Operating And Storage Junction Temperature Range THERMAL RESISTANCE Junction to ambient SYMBOL VCEO VCES VCBO VEBO IC ICM IBM IEM PTA Tj, Tstg BC556 65 80 80 5 BC557 45 50 50 5 100 200 200 200 500 -55 to +150 BC558 30 30 30 5 UNITS V V V V mA mA mA mA mW [ ... ]

BC558A PDF Datasheet Download