This part is a kind of semiconductor called SJ2206B.

Function of this product has 2.3W dual-channel audio power amplifier.

Manufacturers : szsanjing

Image and pinout :

Some of the text within the PDF file :

Èý¾§µç×ÓÓÐÏÞ¹«Ë¾ SJ2206B 2.3W ¸ÅÊö £º Ë«ÉùµÀÒôƵ¹¦ÂÊ·Å´óÆ÷ SJ2206B SJ2206B ÊÇÒ»¿éÓÉÁ½Í¨µÀ¹¦ÂÊ·Å´óÆ÷×é³ÉµÄµ¥Æ¬¼¯³Éµç· ¡£ ¹ã·ºÓ¦ÓÃÓÚÎÞÏßµçºÐʽ´Å´ø¼Òô µçÇÅ·Å´óÆ÷ÖÐ ¡£ ¹¦ÄÜ £º ¸ßÊä³ö¹¦ÂÊ Á¢ÌåÉù : Po=2.3W ( µäÐÍ ) at Vcc=9V, RL=4 Ω Πο=3Ω ατ ςχχ=11ς, ΡΛ=4 Ω ∝∩⊕ : Πο=4. 5Ω ( ∝™∠⊆ ) ατ ςχχ=9ς, ΡΛ=8 Ω ÷⇓∅∝⊇±∝⊆∩∠≈≈⊇♣∏ ⊗∨√℘″™∝ℜ• ≤← ↵♠≠¬⊇±™⊃∠ϒ ⊗∨√℘″♦∈∅ℜ⊄″♦∅ ≤← ″♦∈∅®√√∅≡℘ ⊆♦∝ℵ•√ℵ∂∪÷⇓ ⊇™≥±∞≡⊆⊇±®∝∪〈≡⊆ ⊆♦�� [ ... ]

SJ2206B PDF Datasheet Download