W25Q32JV32-Mbit Dual/Quad SPI NOR flash

W25Q32JV is a 32-Mbit serial NOR flash memory, equivalent to 4 MiB of addressable storage. It retains data without power and supports standard, Dual and Quad SPI instructions. A controller supplies the clock and commands; the memory does not execute application code by itself. The array contains 16,384 pages of 256 bytes and 1,024 erasable 4 KiB sectors. Programming changes selected bits from one to zero, while an erase restores an entire sector or block to ones. Firmware must split page writes and preserve data that shares an erase unit. The views show the industrial Q-option PDIP-8 and 208-mil SOIC-8 packages from the referenced Winbond revision. Both operate at 2.7–3.6 V, with IO2 and IO3 reserved for quad transfers. The basic circuit uses 3.3 V standard SPI to read the JEDEC identification bytes EF 40 16 without altering memory.