This part is a kind of semiconductor called STK4352.

Function of this product has AF Power Amplifier.

Manufacturers : Sanyo Semicon Device

Image and pinout :

Some of the text within the PDF file :

Ordering number: EN 1228C Thick Film Hybrid IC STK4352 AF Power Amplifier (7W + 7W min, THD = 1.0%) Features Package Dimensions unit: mm 4032 [STK4352] • Small and slim package with 25.5mm height. • Capable of guaranteeing substrate temperature 125°C, thereby reducing heat sink. • Excellent cost performance. Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Thermal resistance Junction temperature Operating substrate temperature Storage temperature Available time for load short-circuit Symbol VCC max θj-c Tj TC Tstg ts VCC = 27V, RL = 8Ω, Po = 7W, f = 50Hz Pin 4 to 7, 12 One power transistor Conditions Ratings 39 7 150 125 −30 to +125 2 Unit V °C/W °C °C °C s Recommended Operating Conditions at Ta = 25°C Parameter Rec [ ... ]

STK4352 PDF Datasheet Download