The Winbond W25Q256JWEIQ is a 256 Mbit (32 MB) SpiFlash® serial NOR flash organized as 32M x 8, and it is the high-density member of the low-voltage corner of the family: it operates from 1.7 V to 1.95 V and is packaged in an 8-lead WDFN presented as an 8-WSON measuring 8 mm x 6 mm, supplied in a tray.
Putting 32 MB onto a 1.8 V rail in only eight leads is the combination that suits high-capacity, low-power platforms such as wireless SoCs, wearables, and battery devices that already run a single 1.8 V domain. Direct interface with 1.8 V logic avoids level shifting, and the exposed pad gives the erase and program bursts a thermal path into the board plane.
Two parameters set this variant apart from the smaller-density parts in the group. The specification lists a 6 ns access time, the fastest figure listed here, and page program at 5 ms, a slightly longer write than the 3 ms common on lower-density W25Q parts, worth knowing when budgeting OTA update time. Clock is 133 MHz with standard SPI and Dual/Quad I/O, over -40°C to 85°C.
Select the JWEIQ when the requirement is 32 MB at 1.8 V in the smallest board area possible. If your supply rail is 3.3 V instead, the 256 Mbit W25Q256JVFIQ in the 16-pin SOIC is the 3.3 V alternative, at the cost of a larger footprint.