24LC256

{
  "schema_version": 1,
  "type": "component",
  "slug": "24lc256",
  "title": "24LC256",
  "brief": "Microchip 256 Kbit I2C EEPROM, SOIC-8. 32K x 8, 2.5-5.5 V, 400 kHz, 64-byte page. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "memory",
    "eeprom",
    "i2c",
    "soic-8",
    "microchip"
  ],
  "component": {
    "mpn": "24LC256",
    "manufacturer": "Microchip Technology",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Memory",
    "subcategory": "I2C serial EEPROM",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/24AA256-24LC256-24FC256-Data-Sheet-20001203W.pdf",
    "parts": {
      "symbol": "24lc256.kicad_sym",
      "footprint": "24lc256.kicad_mod",
      "model_3d": "24lc256-etched.glb",
      "model_3d_plain": "24lc256.glb",
      "lbr": "24lc256.lbr",
      "model_3d_step": "24lc256-etched.step",
      "model_3d_step_plain": "24lc256.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "User-configurable chip-select address bit 0. Compared with the corresponding bit of the incoming slave address; must be tied to VCC or VSS. Combined with A1/A2 to allow up to 8 devices on one I2C bus."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "User-configurable chip-select address bit 1. Compared with the corresponding bit of the incoming slave address; must be tied to VCC or VSS."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "User-configurable chip-select address bit 2. Compared with the corresponding bit of the incoming slave address; must be tied to VCC or VSS."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "5",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Bidirectional serial address/data I/O. Open-drain output; requires an external pull-up resistor to VCC (typ. 10 kΩ for 100 kHz, 2 kΩ for 400 kHz and 1 MHz). Data may change only while SCL is low."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "Serial clock input used to synchronize data transfers to and from the device. Schmitt-trigger input for noise suppression."
      },
      {
        "number": "7",
        "name": "WP",
        "type": "input",
        "description": "Write-protect input. Tie to VSS to enable writes; tie to VCC to inhibit write operations (reads are unaffected). Must not be left floating."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input. Operating range 2.5V to 5.5V for 24LC256. Decouple with a local bypass capacitor to VSS."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/24AA256-24LC256-24FC256-Data-Sheet-20001203W.pdf",
        "pages": 42,
        "sha256": "ee9e9f15a6ce94e3",
        "source_tier": "mfr"
      },
      "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"
    },
    "models_3d": [
      {
        "file": "24lc256.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": "24lc256-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": "7916556bade8b76669555e8de6df763cd92c412b3cd11334d1958c42a8c6b326",
        "checked": "2026-11-03",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "I2C serial EEPROM",
      "Capacity": "256 Kbit (32K x 8)",
      "Interface": "I2C, up to 400 kHz",
      "Supply voltage": "2.5-5.5 V",
      "Page write": "64-byte buffer",
      "Write protect": "WP pin (hardware)",
      "Addressing": "A0-A2 (up to 8 on a bus)",
      "Package": "SOIC-8",
      "Body (L×W×H)": "4.9 × 3.9 × 1.75 mm"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "24lc256",
    "256kbit i2c eeprom",
    "serial eeprom soic-8",
    "32kx8 eeprom"
  ],
  "discovery_pitch": "Microchip 24LC256 256 Kbit I2C serial EEPROM (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "24lc256.kicad_sym",
    "24lc256.kicad_mod",
    "24lc256.glb",
    "24lc256.lbr",
    "docs/hero.png",
    "docs/24lc256-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "24lc256-etched.step"
  ]
}