A 32 Mbit (4 MB) serial NOR flash from the Winbond W25Q family, in the wide SOIC-8, sized for firmware, fonts, and file systems on smaller designs than the 128 Mbit W25Q128 needs. It speaks Standard, Dual, and Quad SPI plus QPI at up to 133 MHz (a 532 MHz-equivalent throughput in Quad), organizes the array in uniform 4 KB erasable sectors, and its six SPI pins double as the four data lines in Quad mode. A single 2.7-3.6 V supply and 100k-cycle endurance make it a drop-in external storage for MCUs, FPGAs, and ESP modules.

Pinout

Pin	Name	Type	Function
1	/CS	input	Chip Select input (active-low). Drive low to enable the device and begin an SPI transaction; drive high to deselect and place DO/IO pins in high-impedance. Requires a full high-to-low transition after power-up before the first instruction; a pull-up resistor is recommended.
2	DO (IO1)	bidirectional	Standard SPI serial Data Output; also acts as bidirectional IO1 for Dual/Quad SPI operations. Data is shifted out on the falling edge of CLK in Standard SPI; in Dual/Quad modes it functions as a bidirectional data line.
3	/WP (IO2)	bidirectional	Active-low Write Protect input for the Status Register in Standard/Dual SPI mode; reassigned as bidirectional IO2 when the Quad Enable (QE) bit in Status Register-2 is set for Quad SPI operations.
4	GND	power_in	Ground reference for the device supply.
5	DI (IO0)	bidirectional	Standard SPI serial Data Input; also acts as bidirectional IO0 for Dual/Quad SPI operations. Instructions, addresses, and data are latched on the rising edge of CLK.
6	CLK	input	SPI Serial Clock input providing the timing for all serial input and output operations. Supports up to 133 MHz; SPI Mode 0 (0,0) and Mode 3 (1,1) are supported.
7	/HOLD or /RESET (IO3)	bidirectional	Active-low Hold input (or optional Reset input, ordering-code dependent) in Standard/Dual SPI mode; reassigned as bidirectional IO3 when Quad Enable (QE) is set. /HOLD pauses serial communication without deselecting the device.
8	VCC	power_in	Positive power supply, 2.7 V to 3.6 V. Must track above the power-on threshold before /CS is driven low.

Key specifications

Parameter	Value
Type	Serial NOR flash memory
Density	32 Mbit (4 MB)
Interface	Standard / Dual / Quad SPI + QPI
Max clock	133 MHz
Erase granularity	4 KB sector (uniform)
Endurance	100k erase/program cycles
Supply voltage	2.7-3.6 V
Package	SOIC-8 (208 mil)

Ordering variants

Same part, different packaging or reel option.

W25Q32JVSSIQ (SOIC-8, 208 mil)
W25Q32JVZPIQ (WSON-8)

CAD (KiCad official)

Symbol: Memory_Flash:W25Q32JVSS
Footprint: Package_SO:SOIC-8_5.3x5.3mm_P1.27mm
3D model: SOIC-8 208 mil (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Winbond datasheet (16 pp, sha256 16abfa1952dadcdb, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF