# AT24C256CDGKRG

**HANSCHIP semiconductor** · EEPROM · MSOP-8

AT24C256CDGKRG from HANSCHIP semiconductor, in a MSOP-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. Along with E1 and E2, selects the three least-significant bits of the I2C 7-bit slave address, allowing up to eight devices on the same bus. Tie directly to VCC or GND. |
| 2 | E1 | input | Device address input bit 1. Along with E0 and E2, selects the three least-significant bits of the I2C 7-bit slave address. Tie directly to VCC or GND. |
| 3 | E2 | input | Device address input bit 2. Along with E0 and E1, selects the three least-significant bits of the I2C 7-bit slave address. Tie directly to VCC or GND. |
| 4 | GND | power_in | Ground reference for the power supply. Must be connected to the system ground. |
| 5 | SDA | bidirectional | Serial Data. Open-drain bidirectional pin used to serially transfer data to and from the device. Requires an external pull-up resistor to VCC. |
| 6 | SCL | input | Serial Clock. Provides the clock to the device controlling data flow. Command and input data are latched in on the rising edge of SCL; output data are clocked out on the falling edge. Requires an external pull-up resistor to VCC. |
| 7 | WP | input | Write Protection. When tied to VCC the entire memory array becomes write-protected (read-only); when tied to GND or left floating, write operations are enabled. Driving WP high causes data bytes to not be acknowledged. |
| 8 | VCC | power_in | Device power supply, 1.7V to 5.5V. Provides the source voltage to the device; operation at invalid VCC voltages may produce spurious results. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HANSCHIP semiconductor |
| Package | MSOP-8 |
| Category | Memory |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `AT24C256CDGKRG`
- `AT24C256CDGKRGPG`
- `AT24C256CDGKRGDRG`
- `AT24C256CDGKRGDRG4`
- `AT24C256CDGKRGPWRG`

## CAD (KiCad official)

- Symbol: `AT24C256CDGKRG`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `at24c256cdgkrg-etched.step` / `at24c256cdgkrg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `at24c256cdgkrg.step` / `at24c256cdgkrg.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HANSCHIP semiconductor datasheet](docs/at24c256cdgkrg-datasheet.pdf) (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](docs/at24c256cdgkrg-datasheet.pdf)