This part is a kind of semiconductor called AT45DB041D-SSU-2.5.

Function of this product has 4-megabit 2.5-volt or 2.7-volt DataFlash.

Manufacturers : Adesto

Image and pinout :

Some of the text within the PDF file :

Features • Single 2.5V or 2.7V to 3.6V Supply • RapidSTM Serial Interface: 66MHz Maximum Clock Frequency – SPI Compatible Modes 0 and 3 • User Configurable Page Size – 256-Bytes per Page – 264-Bytes per Page – Page Size Can Be Factory Pre-configured for 256-Bytes Page Program Operation – Intelligent Programming Operation – 2,048 Pages (256-/264-Bytes/Page) Main Memory Flexible Erase Options – Page Erase (256-Bytes) – Block Erase (2-Kbytes) – Sector Erase (64-Kbytes) – Chip Erase (4Mbits) Two SRAM Data Buffers (256-, 264-Bytes) – Allows Receiving of Data while Reprogramming the Flash Array Continuous Read Capability through Entire Array – Ideal for Code Shadowing Applications Low-power Dissipation – 7mA Active Read Current Typical – 25μA Standby Current T [ ... ]

AT45DB041D-SSU-2.5 PDF Datasheet Download