74VHCT540AFT

{
  "slug": "74vhct540aft",
  "version": "0.1.0",
  "type": "component",
  "description": "TOSHIBA Buffers, Drivers, Receivers, Transceivers, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "74vhct540aft",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74vhct540aft.kicad_sym",
    "74vhct540aft.kicad_mod",
    "74vhct540aft.glb",
    "74vhct540aft.step",
    "74vhct540aft.lbr",
    "docs/hero.png",
    "docs/74vhct540aft-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "74vhct540aft-hero.glb",
    "74vhct540aft-hero.overlay.json",
    "74vhct540aft-etched.glb"
  ],
  "component": {
    "mpn": "74VHCT540AFT",
    "manufacturer": "TOSHIBA",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Logic",
    "subcategory": "Buffers, Drivers, Receivers, Transceivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590225348601278464",
    "parts": {
      "symbol": "74vhct540aft.kicad_sym",
      "footprint": "74vhct540aft.kicad_mod",
      "model_3d": "74vhct540aft-hero.glb",
      "model_3d_plain": "74vhct540aft-etched.glb",
      "model_3d_step": "74vhct540aft-etched.step",
      "model_3d_step_plain": "74vhct540aft.step",
      "lbr": "74vhct540aft.lbr"
    },
    "distributor_links": {
      "lcsc": "C2975841",
      "digikey": "74VHCT540AFTTR-ND",
      "mouser": "757-74VHCT540AFT"
    },
    "distributor_check": {
      "checked_at": "2026-10-16T04:18:32Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "74VHCT540AFTTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "757-74VHCT540AFT",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "G1",
        "type": "input",
        "description": "Active-low output enable 1; when G1 or G2 is high the outputs are in the high-impedance state."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Data input 1; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Data input 2; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "4",
        "name": "A3",
        "type": "input",
        "description": "Data input 3; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "5",
        "name": "A4",
        "type": "input",
        "description": "Data input 4; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "6",
        "name": "A5",
        "type": "input",
        "description": "Data input 5; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "7",
        "name": "A6",
        "type": "input",
        "description": "Data input 6; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "8",
        "name": "A7",
        "type": "input",
        "description": "Data input 7; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "9",
        "name": "A8",
        "type": "input",
        "description": "Data input 8; inputs are TTL-compatible (VIL 0.8 V max, VIH 2.0 V min) and tolerate 0 to 5.5 V."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (0 V) reference."
      },
      {
        "number": "11",
        "name": "Y8",
        "type": "tri_state",
        "description": "Inverted 3-state output 8 (inverse of A8); high-impedance when G1 or G2 is high."
      },
      {
        "number": "12",
        "name": "Y7",
        "type": "tri_state",
        "description": "Inverted 3-state output 7 (inverse of A7); high-impedance when G1 or G2 is high."
      },
      {
        "number": "13",
        "name": "Y6",
        "type": "tri_state",
        "description": "Inverted 3-state output 6 (inverse of A6); high-impedance when G1 or G2 is high."
      },
      {
        "number": "14",
        "name": "Y5",
        "type": "tri_state",
        "description": "Inverted 3-state output 5 (inverse of A5); high-impedance when G1 or G2 is high."
      },
      {
        "number": "15",
        "name": "Y4",
        "type": "tri_state",
        "description": "Inverted 3-state output 4 (inverse of A4); high-impedance when G1 or G2 is high."
      },
      {
        "number": "16",
        "name": "Y3",
        "type": "tri_state",
        "description": "Inverted 3-state output 3 (inverse of A3); high-impedance when G1 or G2 is high."
      },
      {
        "number": "17",
        "name": "Y2",
        "type": "tri_state",
        "description": "Inverted 3-state output 2 (inverse of A2); high-impedance when G1 or G2 is high."
      },
      {
        "number": "18",
        "name": "Y1",
        "type": "tri_state",
        "description": "Inverted 3-state output 1 (inverse of A1); high-impedance when G1 or G2 is high."
      },
      {
        "number": "19",
        "name": "G2",
        "type": "input",
        "description": "Active-low output enable 2; when G1 or G2 is high the outputs are in the high-impedance state."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, operating range 4.5 to 5.5 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": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 8,
        "cost_usd": 0.3286,
        "at": "2026-10-16T04:18:14"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590225348601278464",
        "pages": 8,
        "sha256": "3a3485b289292fb2",
        "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": "74vhct540aft.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": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74vhct540aft-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": "10a65eda81f8bc33f2f6e16d14f5cbc10d5100e3fc20c5b69accc81ab8501ee1",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}