ZD25WQ16CTIGT from Zetta, in a SOP-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	Chip Select input, active low. Drives the device into active mode on falling edge and into standby (SO High-Z) on rising edge. Must be pulled high externally when the master is idle.
2	SO/IO1	bidirectional	Standard SPI Serial Data Output (SO); becomes bidirectional data line IO1 in Dual/Quad SPI and QPI modes. Data is shifted out on the falling edge of SCLK in standard mode.
3	WP#/IO2	bidirectional	Write Protect input (active low) when QE=0, gating Status Register writes together with SRP1/SRP0. When QE=1 the pin serves as bidirectional Quad data line IO2. Do not tie directly to VCC/GND if Quad operation may be used.
4	VSS	power_in	Ground reference (0 V) for the device. Connect to the system ground plane with a short, low-inductance path.
5	SI/IO0	bidirectional	Standard SPI Serial Data Input (SI); becomes bidirectional data line IO0 in Dual/Quad SPI and QPI modes. Data is latched on the rising edge of SCLK in standard mode.
6	SCLK	input	Serial Clock input, up to 104 MHz. Supports SPI mode 0 and mode 3 (CPOL/CPHA = 0/0 or 1/1). Input data is latched on the rising edge and output data is shifted on the falling edge.
7	HOLD#/IO3	bidirectional	Hold input (active low) when QE=0; pausing serial communication while CS# stays low and driving SO High-Z. When QE=1 the pin serves as bidirectional Quad data line IO3. HOLD function is disabled in Quad I/O and QPI modes.
8	VCC	power_in	Device power supply, 1.65 V to 3.6 V for read, program and erase. Decouple to VSS with a 100 nF ceramic capacitor placed close to the pin.

Key specifications

Parameter	Value
Manufacturer	Zetta
Package	SOP-8
Category	Memory
Pins	8

Ordering variants

Same part, different packaging or reel option.

ZD25WQ16CTIGT
ZD25WQ16CTIGR
ZD25WQ16CTIGTCTEGT
ZD25WQ16CTIGTCTEGR
ZD25WQ16CTIGTCSIG
ZD25WQ16CTIGTCSEG
ZD25WQ16CTIGTCOIG
ZD25WQ16CTIGTCOEG
ZD25WQ16CTIGTCUIG
ZD25WQ16CTIGTCUEG
ZD25WQ16CTIGTCEIG
ZD25WQ16CTIGTCEEG

CAD (KiCad official)

Symbol: ZD25WQ16CTIGT
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`zd25wq16ctigt.step`	122 KB	You want the bare part, or you mark your own boards.
`zd25wq16ctigt-etched.step`	2.3 MB	You want the part with `ZD25WQ16CTIGT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 583 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: Zetta datasheet (87 pp, sha256 bfa49c113191080d, 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