This part is a kind of semiconductor called SJ8227.

Function of this product has 3W stereo audio amplifier circuit.

Manufacturers : SJ

Image and pinout :

Some of the text within the PDF file :

Èý¾§µç×ÓÐÏÞ¹«Ë Ë«ÉùµÀ ¸ÅÊöÓëÌصã SJ8227 ÊÇË«ÉùµÀÒôƹ¦Â·Å´ó¼¯³ç¡£ ¸Ãµç·ÄÌØãÈÏ£º ¹¤×÷µçÔ´Ñ ·¶Î§ ª Æäʳö¹¦Â´ó£º SJ8227 3W ÒôƵ¹¦·Å硪 SJ8227 5¡« 12V£» Pout = 2.5W (Type) ÄÚº¬¹¤×÷ ²ÉÓôø¢ÈƬµÄË«ÁÐÖ±å ´ËÍ⣬ü»¹¾ßÓнԪ¼þÉÙùµÀ·Öë¶È¸ß£¬±ÆÔÉÙµçѹöÒæ¿ÓÍâ½×è÷ÚµÈÌØã¡£ (VCC = 9 V RL= 4Ω F = 1K Hz THD = 10%) Pout = 3.0W (Type) (VCC = 12V RL= 6Ω F = 1K Hz THD = 10%) Pout = 3.0W (Type) (VCC = 9V RL= 3Ω F = 1K Hz THD = 10%) /´ý»ú¿ª¹Ø£ 12 ½ÅËÜÁÏ·â×°£¨ HDIP12£© ¡£ ·½¿òͼÓëÒý³ö¶Ë¹¦ÄÜ 12 Vcc1 + + Vstb 1 2 3 TAB Pre-GND 4 11 10 TAB 9 8 7 5 6 Òý³ö¶Ë Ðò [ ... ]

SJ8227 PDF Datasheet Download