AT24C256CDRG from HANSCHIP semiconductor, 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. Hard-wired to VCC or GND to set the least-significant bit of the I2C 7-bit slave address, allowing up to eight devices on the same bus.
2	E1	input	Device Address Input bit 1. Hard-wired to VCC or GND to set an address bit of the I2C 7-bit slave address.
3	E2	input	Device Address Input bit 2. Hard-wired to VCC or GND to set an address bit of the I2C 7-bit slave address.
4	GND	power_in	Ground reference for the power supply. Must be connected to system ground.
5	SDA	bidirectional	Serial Data. Open-drain bidirectional I2C data line used to serially transfer data to and from the device. Requires an external pull-up resistor to VCC. Includes Schmitt-trigger and spike suppression filtering.
6	SCL	input	Serial Clock. Master-driven clock input used to control the flow of data. Data on SDA is latched on the rising edge and clocked out on the falling edge of SCL. Supports 400 kHz and 1 MHz operation.
7	WP	input	Write Protect. When tied to VCC the entire memory array (and Identification Page) becomes read-only; when tied to GND or left floating, write operations are enabled. Driving WP high during a write causes data bytes not to be acknowledged.
8	VCC	power_in	Device Power Supply. Operating range 1.7 V to 5.5 V. Operations at invalid VCC voltages may produce spurious results and should not be attempted.

Key specifications

Parameter	Value
Manufacturer	HANSCHIP semiconductor
Package	SOP-8
Category	Memory
Pins	8

Ordering variants

AT24C256CDRG
AT24C256CDRG4
AT24C256CDRGCPG
AT24C256CDRGCDGKRG
AT24C256CDRGCPWRG

CAD (KiCad official)

Symbol: AT24C256CDRG
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
`at24c256cdrg.step`	122 KB	You want the bare part, or you mark your own boards.
`at24c256cdrg-etched.step`	2.5 MB	You want the part with `AT24C256CDRG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 606 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: HANSCHIP semiconductor datasheet (25 pp, sha256 15b5ab05a811009e, 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