AT24C128AM from HGSEMI, 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	A0	input	Device address input bit 0. Hard-wired to VCC or GND to select one of up to 8 devices sharing the I2C bus. Internally biased to logic low if left floating.
2	A1	input	Device address input bit 1. Hard-wired to VCC or GND to select one of up to 8 devices sharing the I2C bus. Internally biased to logic low if left floating.
3	A2	input	Device address input bit 2. Hard-wired to VCC or GND to select one of up to 8 devices sharing the I2C bus. Internally biased to logic low if left floating.
4	GND	power_in	Ground reference for the device.
5	SDA	bidirectional	Bidirectional I2C serial data line. Open-drain output; requires an external pull-up resistor to VCC. May be wire-ORed with other open-drain/open-collector devices.
6	SCL	input	I2C serial clock input. Positive edges clock data into the EEPROM; negative edges clock data out. Supports 100 kHz, 400 kHz, and 1 MHz bus speeds.
7	WP	input	Hardware write protect. Tie to GND for normal read/write operation; tie to VCC to write-protect the full 128 Kbit array.
8	VCC	power_in	Positive supply voltage input. Single-supply operation up to 1 MHz interface speed.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

AT24C128AM/TR
AT24C128AMAN
AT24C128AMM/TR
AT24C128AMADQ/TR

CAD (KiCad official)

Symbol: AT24C128AM
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: HGSEMI datasheet (15 pp, sha256 ed9771daf6536261, 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