This part is a kind of semiconductor called IL5009.

Function of this product has Speaker Amplifier.

Manufacturers : IK Semiconductor

Image and pinout :

Some of the text within the PDF file :

TECHNICAL DATA Speaker Amplifier The IL5009 is a monolithic integrated circuit designed for speaker amp. FEATURES • Operating supply voltage range : Vcc = 1.5V ~ 5.0V • Recommended operating supply voltage : Vcc = 3V • Low quiescent : Icc = 3.9mA • Package is compact. IL5009 APPLICATION • Telephone set MAXIMUM RATINGS Characteristics Supply Voltage Power Dissipation Operating Temperature Storage Temperature BLOCK DIAGRAM & APPLICATION CIRCUIT w w w t a .D S a e h Symbol Vcc PD Topr Tstr U 4 t e ORDERING INFORMATION IL5009N Plastic IL5009D SOIC TA = -20° to 60° C for package .c m o Unit V mW ºC ºC Rating 10 800 -20 ~ +60 -55 ~ +150 IL5009 ELECTRICAL DC CHARACTERISTICS (Pin Voltage at Vcc = 3V and no input signal) Pin No. 1 2 3 4 Symbol V1 [ ... ]

IL5009 PDF Datasheet Download