This part is a kind of semiconductor called SDRX2BD.

Function of this product has 5 FUNCTIONS REMOTE CONTROLLER.

Manufacturers : Bai Sheng Wei Electronics

Image and pinout :

Some of the text within the PDF file :

深圳市盛佰威电子有限公司 销售热线：0755-61169046 报价 QQ635222749 SCTX2B/SDRX2BD (NO：S&CIC0515) FIVE FUNCTIONS REMOTE CONTROLLER Features     Wide operating SCTX2B voltage range: 2.4V to 12V SCTX2B very low stand-by current Few external components needed SDRX2BD built- in 3.8v zener General Description The SCTX2B/RX2BD are a pair of CMOS LSIs designed for remote controlled car applications. The SCTX2B/RX2BD have five control keys controlling the motions ( i.e. forward, backward, rightward, leftward, and the turbo function ) of the remote controlled car. Absolute Maximum Ratings DC Supply Voltage-0.3V to 5.0V Input/Output Voltage---GND –0.2V to VDD+0.2V Operating temperature- -1 [ ... ]

SDRX2BD PDF Datasheet Download