W25X20CLSNIG from Winbond Elec, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	/CS	input	Active-low SPI Chip Select input. When /CS is high the device is deselected and DO/IO0/IO1 are high impedance; driving /CS low selects the device for instruction transfer. Must track VCC at power-up (pull-up resistor recommended).
2	DO (IO1)	bidirectional	Serial Data Output for Standard SPI (unidirectional, data shifted out on falling edge of CLK). Becomes bidirectional IO1 during Dual SPI instructions (Fast Read Dual Output 3Bh, Fast Read Dual I/O BBh).
3	/WP	input	Active-low Write Protect input. Used in conjunction with Status Register SRP and Block Protect bits (TB, BP1, BP0) to hardware-protect a portion or the entire memory array from Status Register writes.
4	GND	power_in	Ground reference for the device.
5	DI (IO0)	bidirectional	Serial Data Input for Standard SPI (unidirectional, data shifted in on rising edge of CLK). Becomes bidirectional IO0 during Dual SPI instructions.
6	CLK	input	Serial Clock input. Provides the timing for serial input and output operations. Supports up to 104MHz clock frequency; Modes 0 (CPOL=0/CPHA=0) and 3 (CPOL=1/CPHA=1) are supported.
7	/HOLD	input	Active-low Hold input. When /HOLD is low while /CS is low, DO becomes high-impedance and DI/CLK are ignored, pausing the device without deselecting it. Useful when sharing SPI signals with other devices.
8	VCC	power_in	Power supply input, 2.3V to 3.6V operating range (2.5V/3V/3.3V nominal). Typical active current 1mA; power-down current <1uA.

Key specifications

Parameter	Value
Manufacturer	Winbond Elec
Package	SOIC-8
Category	Memory
Pins	8

Ordering variants

Same part, different packaging or reel option.

W25X20CLSNIG
W25X20CLSNIGSVIG
W25X20CLSNIGZPIG
W25X20CLSNIGUXIG

CAD (KiCad official)

Symbol: W25X20CLSNIG
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`w25x20clsnig.step`	122 KB	You want the bare part, or you mark your own boards.
`w25x20clsnig-etched.step`	2.4 MB	You want the part with `W25X20CLSNIG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 589 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Winbond Elec datasheet (50 pp, sha256 4a9b7de0f7175cd5, retrieved 2026-08-17, tier: lcsc)
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