AT24C128C-SSHM-T 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	Device address input, bit 0. Hard-wired to GND or VCC to set the chip's I²C slave address, allowing up to eight AT24C128C devices on one bus. Internally pulled to GND via a weak pull-down (disengages above ~0.5×VCC); Microchip recommends tying to a known state. External pull-up (if used) should be ≤10 kΩ.
2	A1	input	Device address input, bit 1. Hard-wired to GND or VCC to select the I²C slave address. Internally pulled down to GND when floating; tie to a known state. External pull-up ≤10 kΩ recommended.
3	A2	input	Device address input, bit 2. Hard-wired to GND or VCC to select the I²C slave address. Internally pulled down to GND when floating; tie to a known state. External pull-up ≤10 kΩ recommended.
4	GND	power_in	Ground reference for the power supply. Connect to the system ground plane.
5	SDA	bidirectional	I²C serial data - open-drain bidirectional input/output. Requires an external pull-up resistor to VCC (≤10 kΩ). May be wire-ORed with other open-drain devices on the same I²C bus.
6	SCL	input	I²C serial clock input. Commands and input data on SDA are latched on the rising edge of SCL; output data on SDA is clocked out on the falling edge. Must be driven high or pulled up externally when the bus is idle.
7	WP	input	Hardware write-protect input. Tie to GND for normal read/write operation; tie to VCC to inhibit all write operations to the entire memory array. Internally pulled down to GND when floating; tie to a known state.
8	VCC	power_in	Device power supply, 1.7V to 5.5V (2.5V to 5.5V required for 1 MHz Fast Mode Plus operation). Active current 3 mA max; standby current 6 µA max. Decouple with a local ceramic capacitor.

Key specifications

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

Ordering variants

AT24C128C-SSHM-T

CAD (KiCad official)

Symbol: AT24C128C-SSHM-T
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
`at24c128c-sshm-t.step`	122 KB	You want the bare part, or you mark your own boards.
`at24c128c-sshm-t-etched.step`	2.8 MB	You want the part with `AT24C128C-SSHM-T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 685 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 (39 pp, sha256 d583c8741b257ee2, 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