This part is a kind of semiconductor called AN17850A.

Function of this product has 70W x 1-Ch BTL Power Amplifier.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

Prepared Checked Approved Product Specifications Ref No. Total Page Page No. A 17 1 AN17850A Structure Appearance Application Silicon Monolithic Bipolar IC SIL-12 Pins Plastic Package (FP-12S Power Type With Fin) Audio Function 70W (6Ω) x 1ch BTL Power Amplifier Built-in Standby and Muting Features Incorporating Various Protection Circuits A No. 1 2 3 4 5 6 7 8 Item Storage Temperature Absolute Maximum Ratings Symbol Tstg Topr Popr Gopr Sopr Vcc Icc PD Ratings -55 ~ +150 -25 ~ +75 1.013x105 ±0.61x105 Unit °C °C Pa m/s m/s V A W 2 2 Note Operating Ambient Temperature Operating Ambient Pressure Operating Constant Acceleration Operating Shock Power Supply V oltage Power Supply Current Power Dissipation 9,810 4,900 33 8.0 37.5 1 2 Operating Supply V oltage Range Vcc 10 [ ... ]

AN17850A PDF Datasheet Download