AT24C04M 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/NC	unconnected	Not used on AT24C04 (A0 device-address pin is a no-connect on the 4Kb variant). May be left floating or tied to GND. On the 2Kb AT24C02 this pin selects the least-significant device-address bit.
2	A1	input	Device-address hardware input bit A1. Must match the A1 bit in the device-address byte transmitted by the master. Allows up to four AT24C04 devices on a single I2C bus.
3	A2	input	Device-address hardware input bit A2. Must match the A2 bit in the device-address byte transmitted by the master. Combined with A1 it selects one of four devices on the bus.
4	GND	power_in	Ground reference for supply and I/O signals (0 V).
5	SDA	bidirectional	Bi-directional I2C serial data. Open-drain output, requires an external pull-up resistor to VCC (typ. 4.7 kΩ). May be wire-ORed with other open-drain devices on the same bus.
6	SCL	input	I2C serial clock input. Positive edges clock data into the EEPROM; negative edges clock data out. Up to 1 MHz at 5 V, 400 kHz at 1.8/2.5/2.7 V.
7	WP	input	Hardware Write Protect. Tie to GND for normal read/write operations; tie to VCC to write-protect the full 4K array. Schmitt-triggered, filtered input.
8	VCC	power_in	Positive supply, 1.7 V to 5.5 V. Decouple with a 100 nF ceramic capacitor to GND close to the pin.

Key specifications

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

Ordering variants

AT24C04MM/TR
AT24C04MM-4K/TR
AT24C04MN
AT24C04MMM/TR
AT24C04MM5/TR
AT24C04MM8/TR
AT24C04MDQ3/TR
AT24C04MDQ2/TR

CAD (KiCad official)

Symbol: AT24C04M
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
`at24c04m.step`	122 KB	You want the bare part, or you mark your own boards.
`at24c04m-etched.step`	1.6 MB	You want the part with `AT24C04M` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 408 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 (19 pp, sha256 436467b62ca478ef, 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