This part is a kind of semiconductor called K9F4G08U0D.

Function of this product has 4Gb D-die NAND Flash.

Manufacturers : Samsung

Image and pinout :

Some of the text within the PDF file :

www.net Rev.0.2, May. 2010 K9F4G08U0D K9K8G08U0D K9K8G08U1D K9WAG08U1D Advance 4Gb D-die NAND Flash Single-Level-Cell (1bit/cell) datasheet SAMSUNG ELECTRONICS RESERVES THE RIGHT TO CHANGE PRODUCTS, INFORMATION AND SPECIFICATIONS WITHOUT NOTICE. Products and specifications discussed herein are for reference purposes only. All information discussed herein is provided on an "AS IS" basis, without warranties of any kind. This document and all information discussed herein remain the sole and exclusive property of Samsung Electronics. No license of any patent, copyright, mask work, trademark or any other intellectual property right is granted by one party to the other party under this document, by implication, estoppel or otherwise. Samsung products are not intended for use in l [ ... ]

K9F4G08U0D PDF Datasheet Download