This part is a kind of semiconductor called PL-2303HX.

Function of this product has USB to Serial Bridge Controller.

Manufacturers : Prolific

Image and pinout :

Some of the text within the PDF file :

PL-2303HX Edition (Chip Rev D) USB to Serial Bridge Controller Product Datasheet Document Revision: 1.4.4 Document Release: March 20, 2013 Prolific Technology Inc. 7F, No. 48, Sec. 3, Nan Kang Rd. Nan Kang, Taipei 115, Taiwan, R.O.C. Telephone: +886-2-2654-6363 Fax: +886-2-2654-6161 E-mail: sales@prolific.com.tw Website: http://www.prolific.com.tw Revised Date: March 20, 2013 ds_pl2303HXD_v1.4.4 Disclaimer All the information in this document is subject to change without prior notice. Prolific Technology Inc. does not make any representations or any warranties (implied or otherwise) regarding the accuracy and completeness of this document and shall in no event be liable for any loss of profit or any other commercial damage, including but not limited to special, incidental, consequential, [ ... ]

PL-2303HX PDF Datasheet Download