This part is a kind of semiconductor called BA5417.

Function of this product has HIGH-OUTPUT DUAL POWER AMPLIFIER.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD BA5417 LINEAR INTEGRATED CIRCUIT HIGH-OUTPUT DUAL POWER AMPLIFIER DESCRIPTION The UTC BA5417 is a dual power amplifier of 6~15V-compatible for radio cassette/Mini compo players use. It is developed to equip with standby switching functions for excellent total harmonic distortion and other basic characteristics. FEATURES * Operating power supply voltage range from 6V to 15V. * High output. - POUT = 2.8W (VCC = 9V, RL=3Ω, THD = 10%) - POUT = 5.0W (VCC = 12V, RL=3Ω, THD = 10%) * Excellent audio quality - THD = 0.1% (f = 1kHz, POUT = 0.5W) - eN = 0.3mVrms (Rg = 10kΩ) - RR = 55dB (fRR = 100Hz) * Switching noise (“pop” noise) generated when the power is switched on and off is small. * Ripple mixing when motor starts has been prevented. * Built-in ther [ ... ]

BA5417 PDF Datasheet Download