CAT24C512WI-GT3 from onsemi, 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	A0	input	Device address input bit 0. Combined with A1 and A2 to select one of eight devices on the same I2C bus. Internally pulled down to GND; drive HIGH to set the address bit. Input current up to 75 uA at VCC = 5.5 V.
2	A1	input	Device address input bit 1. Combined with A0 and A2 to select one of eight devices on the same I2C bus. Internally pulled down to GND.
3	A2	input	Device address input bit 2. Combined with A0 and A1 to select one of eight devices on the same I2C bus. Internally pulled down to GND.
4	VSS	power_in	Ground reference for the device.
5	SDA	bidirectional	I2C Serial Data I/O pin. Open-drain output; requires an external pull-up resistor to VCC. Data is acquired on the rising edge of SCL and delivered on the falling edge. Pin capacitance up to 8 pF.
6	SCL	input	I2C Serial Clock input generated by the bus master. Supports Standard (100 kHz), Fast (400 kHz) and Fast-Plus (1 MHz) modes. Schmitt-trigger input with noise suppression filter.
7	WP	input	Write Protect input. When held HIGH, all write operations to the memory array are inhibited (hardware write protection for the entire memory). Internally pulled down to GND; leave floating or tie LOW to permit writes.
8	VCC	power_in	Positive supply voltage input. Operating range 1.8 V to 5.5 V. Absolute maximum 6.5 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

CAT24C512WI-GT3
CAT24C512WI-GT3WI-T3
CAT24C512WI-GT3XI-GT3
CAT24C512WI-GT3XI-T3
CAT24C512WI-GT3LI
CAT24C512WI-GT3YI-GT3
CAT24C512WI-GT3YI-T3
CAT24C512WI-GT3ZI-GT3
CAT24C512WI-GT3HU5I-GT3
CAT24C512WI-GT3C8A

CAD (KiCad official)

Symbol: CAT24C512WI-GT3
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
`cat24c512wi-gt3.step`	122 KB	You want the bare part, or you mark your own boards.
`cat24c512wi-gt3-etched.step`	2.6 MB	You want the part with `CAT24C512WI-GT3` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 642 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: onsemi datasheet (17 pp, sha256 174dee97153cad86, retrieved 2026-08-17, tier: manufacturer)
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