AT24C256CM

{
  "schema_version": 1,
  "type": "component",
  "slug": "at24c256cm",
  "title": "AT24C256CM",
  "brief": "HGSEMI EEPROM, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "memory",
    "at24c256cm"
  ],
  "component": {
    "mpn": "AT24C256CM",
    "manufacturer": "HGSEMI",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Memory",
    "subcategory": "EEPROM",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2405210917_HGSEMI-AT24C256CM-TR_C7432367.pdf",
    "parts": {
      "symbol": "at24c256cm.kicad_sym",
      "footprint": "at24c256cm.kicad_mod",
      "model_3d": "at24c256cm-etched.glb",
      "model_3d_plain": "at24c256cm.glb",
      "model_3d_step": "at24c256cm-etched.step",
      "model_3d_step_plain": "at24c256cm.step",
      "lbr": "at24c256cm.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "E0",
        "type": "input",
        "description": "Device address input bit 0. Hard-wired to VCC or GND to set the least-significant bit of the 7-bit I2C slave address, allowing up to eight AT24C256C devices on the same bus. Schmitt-trigger CMOS input."
      },
      {
        "number": "2",
        "name": "E1",
        "type": "input",
        "description": "Device address input bit 1. Hard-wired to VCC or GND to set one of the three slave-address selection bits (E2, E1, E0). Schmitt-trigger CMOS input."
      },
      {
        "number": "3",
        "name": "E2",
        "type": "input",
        "description": "Device address input bit 2. Hard-wired to VCC or GND to set the most-significant slave-address selection bit. Schmitt-trigger CMOS input."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the power supply. Must be tied to system ground."
      },
      {
        "number": "5",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Serial data. Open-drain bidirectional I2C data line; requires an external pull-up resistor to VCC. Data is latched on the rising edge of SCL and driven out on the falling edge."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "Serial clock input. Provides the clock reference for the 2-wire I2C interface; supports Standard (100 kHz), Fast (400 kHz), and High-Speed (1 MHz) modes. Schmitt-trigger input with integrated spike-suppression filter."
      },
      {
        "number": "7",
        "name": "WP",
        "type": "input",
        "description": "Write-Protect input. Tie to VCC to hardware write-protect the entire memory array (device becomes read-only); tie to GND or leave floating to enable normal write operations."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Device power supply, 1.7 V to 5.5 V. Recommend a 100 nF ceramic decoupling capacitor between VCC and GND close to the pin. Standby current <1 uA typical."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2405210917_HGSEMI-AT24C256CM-TR_C7432367.pdf",
        "pages": 25,
        "sha256": "fc01506b5cd4c437",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "at24c256cm.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at24c256cm-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0246b17145004f5c316ae6c99c98b88d8de1918208ad81360a81ee1b24b7d5f3",
        "checked": "2026-11-03",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "SOP-8",
      "Category": "Memory",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "at24c256cm"
  ],
  "discovery_pitch": "AT24C256CM (HGSEMI) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "at24c256cm.kicad_sym",
    "at24c256cm.kicad_mod",
    "at24c256cm.glb",
    "at24c256cm.step",
    "at24c256cm-etched.step",
    "at24c256cm.lbr",
    "docs/hero.png",
    "docs/at24c256cm-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T17:07:56.282Z"
}