This part is a kind of semiconductor called 25Q16BSIG.
Function of this product has Uniform Sector Dual and Quad Serial Flash.
Manufacturers : GigaDevice
Image and pinout :
Some of the text within the PDF file :
25Q16BSIG FEATURES ◆ 16M-bit Serial Flash -2048K-byte -256 bytes per programmable page ◆ Standard, Dual, Quad SPI -Standard SPI: SCLK, CS#, SI, SO, WP#, HOLD# -Dual SPI: SCLK, CS#, IO0, IO1, WP#, HOLD# -Quad SPI: SCLK, CS#, IO0, IO1, IO2, IO3 ◆ High Speed Clock Frequency -120MHz for fast read with 30PF load -Dual I/O Data transfer up to 180Mbits/s -Quad I/O Data transfer up to 360Mbits/s ◆ Program/Erase Speed -Page Program time: 0.7ms typical -Sector Erase time: 100ms typical -Block Erase time: 0.3/0.4/0.8s typical -Chip Erase time: 16s typical ◆ Flexible Architecture -Sector of 4K-byte -Block of 32/64/128K-byte ◆ Low Power Consumption -20mA maximum active current -5uA maximum power down current ◆ Software/Hardware Write Protection -Write protect all/portion of memory via [ ... ]