74AC240SCX

{
  "slug": "74ac240scx",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Buffers / Drivers, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic ics",
    "74ac240scx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74ac240scx.kicad_sym",
    "74ac240scx.kicad_mod",
    "74ac240scx.glb",
    "74ac240scx.step",
    "74ac240scx.lbr",
    "docs/hero.png",
    "docs/74ac240scx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "74ac240scx-hero.glb",
    "74ac240scx-hero.overlay.json",
    "74ac240scx-etched.glb"
  ],
  "component": {
    "mpn": "74AC240SCX",
    "manufacturer": "onsemi",
    "package": "SOIC-20-300mil",
    "pin_count": 20,
    "category": "Logic ICs",
    "subcategory": "Buffers / Drivers",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/74ac240scx-d.pdf",
    "parts": {
      "symbol": "74ac240scx.kicad_sym",
      "footprint": "74ac240scx.kicad_mod",
      "model_3d": "74ac240scx-hero.glb",
      "model_3d_plain": "74ac240scx-etched.glb",
      "model_3d_step": "74ac240scx-etched.step",
      "model_3d_step_plain": "74ac240scx.step",
      "lbr": "74ac240scx.lbr"
    },
    "distributor_links": {
      "lcsc": "C5484"
    },
    "distributor_check": {
      "checked_at": "2026-10-31T18:46:16Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "OE1",
        "type": "input",
        "description": "Active-low 3-STATE output enable input for outputs O0-O3 (pins 12, 14, 16, 18); outputs are high impedance when OE1 is HIGH."
      },
      {
        "number": "2",
        "name": "I0",
        "type": "input",
        "description": "Data input I0 whose inverted level appears on output O0 when OE1 is LOW."
      },
      {
        "number": "3",
        "name": "O4",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O4 that sources/sinks 24 mA and is high impedance when OE2 is HIGH."
      },
      {
        "number": "4",
        "name": "I1",
        "type": "input",
        "description": "Data input I1 whose inverted level appears on output O1 when OE1 is LOW."
      },
      {
        "number": "5",
        "name": "O5",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O5 that sources/sinks 24 mA and is high impedance when OE2 is HIGH."
      },
      {
        "number": "6",
        "name": "I2",
        "type": "input",
        "description": "Data input I2 whose inverted level appears on output O2 when OE1 is LOW."
      },
      {
        "number": "7",
        "name": "O6",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O6 that sources/sinks 24 mA and is high impedance when OE2 is HIGH."
      },
      {
        "number": "8",
        "name": "I3",
        "type": "input",
        "description": "Data input I3 whose inverted level appears on output O3 when OE1 is LOW."
      },
      {
        "number": "9",
        "name": "O7",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O7 that sources/sinks 24 mA and is high impedance when OE2 is HIGH."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin (0 V reference)."
      },
      {
        "number": "11",
        "name": "I7",
        "type": "input",
        "description": "Data input I7 whose inverted level appears on output O7 when OE2 is LOW."
      },
      {
        "number": "12",
        "name": "O3",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O3 that sources/sinks 24 mA and is high impedance when OE1 is HIGH."
      },
      {
        "number": "13",
        "name": "I6",
        "type": "input",
        "description": "Data input I6 whose inverted level appears on output O6 when OE2 is LOW."
      },
      {
        "number": "14",
        "name": "O2",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O2 that sources/sinks 24 mA and is high impedance when OE1 is HIGH."
      },
      {
        "number": "15",
        "name": "I5",
        "type": "input",
        "description": "Data input I5 whose inverted level appears on output O5 when OE2 is LOW."
      },
      {
        "number": "16",
        "name": "O1",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O1 that sources/sinks 24 mA and is high impedance when OE1 is HIGH."
      },
      {
        "number": "17",
        "name": "I4",
        "type": "input",
        "description": "Data input I4 whose inverted level appears on output O4 when OE2 is LOW."
      },
      {
        "number": "18",
        "name": "O0",
        "type": "tri_state",
        "description": "Inverting 3-STATE output O0 that sources/sinks 24 mA and is high impedance when OE1 is HIGH."
      },
      {
        "number": "19",
        "name": "OE2",
        "type": "input",
        "description": "Active-low 3-STATE output enable input for outputs O4-O7 (pins 3, 5, 7, 9); outputs are high impedance when OE2 is HIGH."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage pin; recommended 2.0V to 6.0V for AC (4.5V to 5.5V for ACT), absolute maximum -0.5V to +7.0V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 8,
        "cost_usd": 0.2182,
        "at": "2026-10-31T18:46:01"
      },
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/74ac240scx-d.pdf",
        "pages": 8,
        "sha256": "2731981b9213ada7",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "74ac240scx.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          12.8,
          2.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "59a10b341e6972b31d81802a048060326da627d8b92dcf4263064f4f62ec808e",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74ac240scx-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "f8c27db7608333e4009b0abb09fbeb5e5105854701cc7f1785629e138b24007d",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}