This part is a kind of semiconductor called A473.

Function of this product has 2SA473.

Manufacturers : Wing Shing Electronic

Image and pinout :

Some of the text within the PDF file :

2SA473 PNP EPITAXIAL SILICON TRANSISTOR LOW FREQUENCY POWER AMPLIFIER TO-220 ! Complement to 2SC1173 ABSOLUTE MAXIMUM RATINGS (TA=25℃) Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base voltage Collector Current (DC) Collector Dissipation (Tc=25℃) Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg Rating -30 -30 -5 -3 10 150 -50~150 Unit V V V A W ℃ ℃ ELECTRICAL CHARACTERISTICS (TA=25℃) Characteristic Collector Cutoff Current Emitter Cutoff Current DC Current Gain Collector- Emitter Saturation Voltage Current Gain Bandwidth Product Symbol ICBO IEBO HfE1 VCE(sat) FT Test Condition VCB= -30V , IE=0 VEB= -5V , IC=0 VCE= -1V , IC=-0.1A IC=-2A , IB=-0.2A VCE= -2V , IC=-0.5A Min Typ Max -10 10 240 -0.8 100 Uni [ ... ]

A473 PDF Datasheet Download