MM74HC240MTCX

{
  "slug": "mm74hc240mtcx",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Buffers, Drivers, Receivers, Transceivers, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "mm74hc240mtcx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mm74hc240mtcx.kicad_sym",
    "mm74hc240mtcx.kicad_mod",
    "mm74hc240mtcx.glb",
    "mm74hc240mtcx.step",
    "mm74hc240mtcx.lbr",
    "docs/hero.png",
    "docs/mm74hc240mtcx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mm74hc240mtcx-hero.glb",
    "mm74hc240mtcx-hero.overlay.json",
    "mm74hc240mtcx-etched.glb"
  ],
  "component": {
    "mpn": "MM74HC240MTCX",
    "manufacturer": "onsemi",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Logic",
    "subcategory": "Buffers, Drivers, Receivers, Transceivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588929843153014784",
    "parts": {
      "symbol": "mm74hc240mtcx.kicad_sym",
      "footprint": "mm74hc240mtcx.kicad_mod",
      "model_3d": "mm74hc240mtcx-hero.glb",
      "model_3d_plain": "mm74hc240mtcx-etched.glb",
      "model_3d_step": "mm74hc240mtcx-etched.step",
      "model_3d_step_plain": "mm74hc240mtcx.step",
      "lbr": "mm74hc240mtcx.lbr"
    },
    "distributor_links": {
      "lcsc": "C904251",
      "digikey": "MM74HC240MTCXTR-ND",
      "mouser": "512-MM74HC240MTCX"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T17:54:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "MM74HC240MTCXTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "512-MM74HC240MTCX",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "1G",
        "type": "input",
        "description": "Active-LOW output enable for the first group of four buffers (1A1-1A4 to 1Y1-1Y4); HIGH puts outputs 1Y1-1Y4 in high impedance."
      },
      {
        "number": "2",
        "name": "1A1",
        "type": "input",
        "description": "Buffer input 1A1, inverted to output 1Y1 when 1G is LOW."
      },
      {
        "number": "3",
        "name": "2Y4",
        "type": "tri_state",
        "description": "3-STATE inverting output of 2A4 group 2, high impedance when 2G is HIGH, rated 6 mA output current."
      },
      {
        "number": "4",
        "name": "1A2",
        "type": "input",
        "description": "Buffer input 1A2, inverted to output 1Y2 when 1G is LOW."
      },
      {
        "number": "5",
        "name": "2Y3",
        "type": "tri_state",
        "description": "3-STATE inverting output of 2A3 group 2, high impedance when 2G is HIGH, rated 6 mA output current."
      },
      {
        "number": "6",
        "name": "1A3",
        "type": "input",
        "description": "Buffer input 1A3, inverted to output 1Y3 when 1G is LOW."
      },
      {
        "number": "7",
        "name": "2Y2",
        "type": "tri_state",
        "description": "3-STATE inverting output of 2A2 group 2, high impedance when 2G is HIGH, rated 6 mA output current."
      },
      {
        "number": "8",
        "name": "1A4",
        "type": "input",
        "description": "Buffer input 1A4, inverted to output 1Y4 when 1G is LOW."
      },
      {
        "number": "9",
        "name": "2Y1",
        "type": "tri_state",
        "description": "3-STATE inverting output of 2A1 group 2, high impedance when 2G is HIGH, rated 6 mA output current."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground, 0 V reference."
      },
      {
        "number": "11",
        "name": "2A1",
        "type": "input",
        "description": "Buffer input 2A1, inverted to output 2Y1 when 2G is LOW."
      },
      {
        "number": "12",
        "name": "1Y4",
        "type": "tri_state",
        "description": "3-STATE inverting output of 1A4, high impedance when 1G is HIGH, rated 6 mA output current."
      },
      {
        "number": "13",
        "name": "2A2",
        "type": "input",
        "description": "Buffer input 2A2, inverted to output 2Y2 when 2G is LOW."
      },
      {
        "number": "14",
        "name": "1Y3",
        "type": "tri_state",
        "description": "3-STATE inverting output of 1A3, high impedance when 1G is HIGH, rated 6 mA output current."
      },
      {
        "number": "15",
        "name": "2A3",
        "type": "input",
        "description": "Buffer input 2A3, inverted to output 2Y3 when 2G is LOW."
      },
      {
        "number": "16",
        "name": "1Y2",
        "type": "tri_state",
        "description": "3-STATE inverting output of 1A2, high impedance when 1G is HIGH, rated 6 mA output current."
      },
      {
        "number": "17",
        "name": "2A4",
        "type": "input",
        "description": "Buffer input 2A4, inverted to output 2Y4 when 2G is LOW."
      },
      {
        "number": "18",
        "name": "1Y1",
        "type": "tri_state",
        "description": "3-STATE inverting output of 1A1, high impedance when 1G is HIGH, rated 6 mA output current."
      },
      {
        "number": "19",
        "name": "2G",
        "type": "input",
        "description": "Active-LOW output enable for the second group of four buffers (2A1-2A4 to 2Y1-2Y4); HIGH puts outputs 2Y1-2Y4 in high impedance."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, recommended 2 V to 6 V, absolute maximum 7.0 V."
      }
    ],
    "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": [
          "extractor flagged: Pinout is read from the single Connection Diagram (top view), which the ordering table lists for all",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 10,
        "cost_usd": 0.2659,
        "at": "2026-10-20T17:53:12"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588929843153014784",
        "pages": 10,
        "sha256": "aac615dc46ee189c",
        "source_tier": "lcsc"
      },
      "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": "mm74hc240mtcx.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mm74hc240mtcx-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "36158bac6c8e6f473deef55dfb312f5ef63de583632db02b776cdfbca361e8c9",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}