AT24C64CM 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	E0	input	Device address input bit 0. Sets the LSB of the hard-wired I2C slave address, allowing up to eight AT24C64C devices to share a bus. Tie to VCC or GND; if left floating, an internal pull-down to GND is applied.
2	E1	input	Device address input bit 1. Sets bit 1 of the hard-wired I2C slave address. Tie to VCC or GND; internally pulled down to GND if left floating.
3	E2	input	Device address input bit 2 (MSB of the address select). Tie to VCC or GND; internally pulled down to GND if left floating.
4	GND	power_in	Ground reference for the power supply. Must be connected to system ground.
5	SDA	bidirectional	I2C serial data. Open-drain bidirectional line for command, address, and data transfer. Requires an external pull-up resistor to VCC. Data is latched on the rising edge of SCL and driven on the falling edge.
6	SCL	input	I2C serial clock input from the bus master. Controls flow of data into and out of the device; requires an external pull-up resistor to VCC. Supports up to 400 kHz Fast Mode and 1 MHz High-Speed Mode.
7	WP	input	Write Protect input. When tied to VCC, the entire memory array becomes read-only (write commands are NACKed on data bytes). When tied to GND, writes are enabled. Internally pulled down to GND if left floating.
8	VCC	power_in	Device power supply, 1.7 V to 5.5 V. Standby current 1 uA max; active read/write current 0.5 mA max. Bypass with a local decoupling capacitor to GND.

Key specifications

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

Ordering variants

AT24C64CMN
AT24C64CMM
AT24C64CMM/TR
AT24C64CMMT
AT24C64CMMT/TR
AT24C64CMMM
AT24C64CMMM/TR
AT24C64CMDQ
AT24C64CMDQ/TR
AT24C64CMM5
AT24C64CMM5/TR

CAD (KiCad official)

Symbol: AT24C64CM
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`at24c64cm.step`	122 KB	You want the bare part, or you mark your own boards.
`at24c64cm-etched.step`	1.8 MB	You want the part with `AT24C64CM` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 446 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: HGSEMI datasheet (24 pp, sha256 47ba875d6f9c245f, 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