TDA7481 18-Watt Audio Amplifier

TDA7481 18-Watt Audio Amplifier
Price: $6.50
Datasheet: 

The TDA7481 is an class-D audio power amplifier.

It can deliver 18 watts of audio power into a 4 Ohm load with 10% THD.

It comes in the 15-pin Mulitwatt package. See the Datasheet for more details.