24LC128T-I from Microchip, 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	User-configurable chip-address input bit A0. Compared against the corresponding bit in the I2C slave address; must be tied to VSS ('0') or VCC ('1'). Schmitt-trigger input.
2	A1	input	User-configurable chip-address input bit A1. Compared against the corresponding bit in the I2C slave address; must be tied to VSS ('0') or VCC ('1'). Schmitt-trigger input.
3	A2	input	User-configurable chip-address input bit A2. Compared against the corresponding bit in the I2C slave address; must be tied to VSS ('0') or VCC ('1'). Schmitt-trigger input.
4	VSS	power_in	Ground reference for the device (0 V).
5	SDA	bidirectional	Bidirectional I2C serial data line. Open-drain output; requires an external pull-up resistor to VCC (typ. 10 kΩ at 100 kHz, 2 kΩ at 400 kHz/1 MHz). Schmitt-trigger input.
6	SCL	input	I2C serial clock input used to synchronize data transfer to and from the device. Schmitt-trigger input.
7	WP	input	Write-Protect input. Tie to VSS to enable write operations; tie to VCC to inhibit writes (reads unaffected). Must not be left floating.
8	VCC	power_in	Positive supply input. 24LC128 operating range: +2.5V to +5.5V. Recommended local decoupling with a 100 nF ceramic capacitor to VSS.

Key specifications

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

Ordering variants

24LC128T-IP
24LC128T-ISN
24LC128T-ISM
24LC128T-IST
24LC128T-IMS
24LC128T-IMF
24LC128T-IMNY
24LC128T-ICS

CAD (KiCad official)

Symbol: 24LC128T-I
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
`24lc128t-i.step`	122 KB	You want the bare part, or you mark your own boards.
`24lc128t-i-etched.step`	1.8 MB	You want the part with `24LC128T-I` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 458 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: Microchip datasheet (38 pp, sha256 fec27b245e49dbfe, 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