FM25L04B-GTR from Infineon, 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	Chip Select (active LOW). When HIGH the device enters low-power standby, ignores other inputs and tristates SO. A falling edge on CS must occur before every opcode.
2	SO	output	Serial Output (MISO). Data output pin; driven during a read and tristated at all other times including when HOLD is LOW. Data transitions on the falling edge of SCK.
3	WP	input	Write Protect (active LOW). Prevents all write operations including Status Register writes. If HIGH, write access is determined by the Status Register. Tie to VDD if not used.
4	VSS	power_in	Ground for the device. Must be connected to system ground.
5	SI	input	Serial Input (MOSI). All data is clocked into the device on this pin, sampled on the rising edge of SCK. Should always be driven to a valid logic level to meet IDD specifications.
6	SCK	input	Serial Clock. All I/O activity is synchronized to SCK; inputs latched on the rising edge and outputs on the falling edge. Clock frequency 0 to 20 MHz.
7	HOLD	input	Hold (active LOW). When LOW the current operation is suspended; the device ignores any transitions on SCK or CS. All transitions on HOLD must occur while SCK is LOW. Tie to VDD if not used.
8	VDD	power_in	Power supply input to the device. VDD operating range 2.7 V to 3.6 V.

Key specifications

Parameter	Value
Manufacturer	Infineon
Package	SOIC-8
Category	Memory
Pins	8

Ordering variants

Same part, different packaging or reel option.

FM25L04B-GTR
FM25L04B-GTR-DGTR
FM25L04B-GTR-DG

CAD (KiCad official)

Symbol: FM25L04B-GTR
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
`fm25l04b-gtr.step`	122 KB	You want the bare part, or you mark your own boards.
`fm25l04b-gtr-etched.step`	2.2 MB	You want the part with `FM25L04B-GTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 559 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: Infineon datasheet (21 pp, sha256 843a297742047056, 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