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BUY STA505 https://www.utsource.net/itm/p/1147236.html
40V 3.5A QUAD POWER HALF BRIDGE
Description: STA505 is a high-performance, low-power, low-voltage stereo audio power amplifier. Features: Low-voltage operation: 2.5V to 5.5V High-efficiency Class-D architecture Low quiescent current Low EMI High output power: 2.2W/channel (5V, 4Ω) Low THD+N: 0.1% (5V, 1kHz, 4Ω) Thermal and short-circuit protection Shutdown mode Application: Portable audio devices Mobile phones MP3 players Portable media players Portable gaming systems (For reference only)