BY25D80ASTIG from BOYAMICRO, 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 (active low). Enables the device when driven low; when high the device is deselected, drives SO to high-impedance, and enters Standby Power mode. Should be pulled high to VCC during power-up.
2	SO/IO1	bidirectional	Serial Data Output in Standard SPI mode; shifts data out on the falling edge of SCLK. Becomes bidirectional I/O1 during Dual Output Fast Read (3BH) operations.
3	/WP	input	Write Protect (active low). Together with the Status Register SRP bit places the device in Hardware Protected mode, making the non-volatile Status Register bits read-only. Only used in single-bit SPI mode.
4	VSS	power_in	Ground reference for the core and I/O.
5	SI/IO0	bidirectional	Serial Data Input in Standard SPI mode; data is latched on the rising edge of SCLK. Becomes bidirectional I/O0 during Dual Output Fast Read (3BH) operations.
6	SCLK	input	Serial Clock. Provides the timing reference for SPI transfers; supports SPI modes 0 and 3. Up to 55 MHz for Normal Read, 108 MHz for Fast/Dual Read.
7	NC	unconnected	No internal connection. May be left floating or tied to ground; do not use for signal routing.
8	VCC	power_in	Core and I/O power supply, 2.7 V to 3.6 V. Decouple with 10 nF to 100 nF close to the VCC/VSS pins.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

BY25D80ASTIG
BY25D80ASTCG
BY25D80ASSIG
BY25D80ASSCG
BY25D80ASOIG
BY25D80ASOCG
BY25D80ASNIG
BY25D80ASNCG
BY25D80ASMIG
BY25D80ASMCG
BY25D80ASPIG
BY25D80ASPCG

CAD (KiCad official)

Symbol: BY25D80ASTIG
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
`by25d80astig.step`	122 KB	You want the bare part, or you mark your own boards.
`by25d80astig-etched.step`	2.6 MB	You want the part with `BY25D80ASTIG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 633 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: BOYAMICRO datasheet (44 pp, sha256 adc2654280e90880, 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