This part is a kind of semiconductor called STA540SA.

Function of this product has 4 x 10W DUAL/QUAD POWER AMPLIFIER.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

STA540SA 4 x 10W DUAL/QUAD POWER AMPLIFIER TARGET SPECIFICATIONS 1 ■ FEATURES HIGH OUTPUT POWER CAPABILITY – 4 x 9W / 2Ω @12V; 1KHz; 10% – 4 x 10W / 4Ω @17V; 1KHz; 10% – 2 x 26W / 4Ω @14.4V; 1KHz; 10% – 2 x 15W / 8Ω @16V; 1KHz; 10% MINIMUM EXTERNAL COMPONENTS COUNT: – NO BOOTSTRAP CAPACITORS – NO BOUCHEROT CELLS – INTERNALLY FIXED GAIN 20dB ST-BY FUNCTION (CMOS COMPATIBLE) NO AUDIBLE POP DURING ST-BY OPERATIONS DIAGNOSTIC FACILITIES – CLIP DETECTOR – OUT TO GND SHORT – OUT TO VS SHORT – SOFT SHORT AT TURN-ON – THERMAL SHUTDOWN PROXIMITY Figure 1. Package Clipwatt 19 ■ Table 1. Order Codes Part Number STA540SA ■ Package Clipwatt 19 ■ ■ ■ ■ ■ OVERRATING CHIP TEMPERATURE WITH SOFT THERMAL LIMITER VERY INDUCTIVE LOADS ESD 3 DESCRIPTI [ ... ]

STA540SA PDF Datasheet Download