The GD25LB64CSIG, often marked as 25LB64CSIG, is a 64 Mbit (8 MB)low-voltage Serial Flash Memory IC from GigaDevice.
It operates at 1.65 V – 2.0 V (1.8 V class) and supports SPI, Dual SPI, and Quad SPI (QSPI) modes, making it ideal for modern UEFI BIOS, routers, and embedded applications where energy efficiency and high density are required.