GD25Q16ESIG from GigaDevice Semicon Beijing, in a SOP-8-208mil. 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 chip select input. Must be driven high when the device is not selected; must not be left floating after power-on. Falling edge starts a command; rising edge ends it and returns SO to Hi-Z.
2	SO/IO1	bidirectional	Serial data output in standard SPI mode. Becomes bidirectional data line IO1 in Dual SPI and Quad SPI modes. Shifts out on the falling edge of SCLK in standard mode.
3	WP#/IO2	bidirectional	Active-low write-protect input in standard/Dual SPI (protects the Status Register BP4-BP0 and SRP0/SRP1 bits when driven low). Becomes bidirectional data line IO2 in Quad SPI mode when Status Register QE bit = 1.
4	VSS	power_in	Device ground reference (0 V).
5	SI/IO0	bidirectional	Serial data input in standard SPI mode (data latched on the rising edge of SCLK). Becomes bidirectional data line IO0 in Dual and Quad SPI modes.
6	SCLK	input	Serial clock input. Supports SPI modes 0 and 3 with fast-read clock up to 133 MHz at 30 pF load. Input data latched on the rising edge; output data shifts on the falling edge.
7	HOLD#/IO3	bidirectional	Active-low HOLD input in standard/Dual SPI: pauses serial communication without deselecting the device (SO goes Hi-Z, SI/SCLK ignored). Becomes bidirectional data line IO3 in Quad SPI mode when QE = 1.
8	VCC	power_in	Single-supply core/IO power input. Operating range 2.7-3.6 V. Device auto-resets if VCC falls below the write-inhibit threshold VWI.

Key specifications

Parameter	Value
Manufacturer	GigaDevice Semicon Beijing
Package	SOP-8-208mil
Category	Memory
Pins	8

Ordering variants

Same part, different packaging or reel option.

GD25Q16ETIG
GD25Q16ETJG
GD25Q16ETEG
GD25Q16ETFG
GD25Q16ESIG
GD25Q16ESJG
GD25Q16ESEG
GD25Q16ESFG
GD25Q16EEIG
GD25Q16EEJG
GD25Q16EEEG
GD25Q16EEFG
GD25Q16ENIG
GD25Q16ENJG
GD25Q16ENEG
GD25Q16ENFG
GD25Q16EQIG
GD25Q16EQJG
GD25Q16EQEG
GD25Q16EQFG
GD25Q16EWIG
GD25Q16EWJG
GD25Q16EWEG
GD25Q16EWFG

CAD (KiCad official)

Symbol: GD25Q16ESIG
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8-208mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`gd25q16esig.step`	122 KB	You want the bare part, or you mark your own boards.
`gd25q16esig-etched.step`	2.4 MB	You want the part with `GD25Q16ESIG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 587 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: GigaDevice Semicon Beijing datasheet (58 pp, sha256 e664882f90d940a2, 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