USB flash memory storage, SPI interface, Standard SPI NOR Flash, SPI flash memory chip

 MX25L1606 Series 16 Mb (2 M x 8) 3.6 V CMOS Serial Flash Memory - WSON-8

https://www.futureelectronics.com/p/semiconductors--memory--flash--norflash--serial/mx25l1606ezni-12g-macronix-1127834