MC74HCT245ADTG

{
  "slug": "mc74hct245adtg",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Buffers / Drivers, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic ics",
    "mc74hct245adtg",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mc74hct245adtg.kicad_sym",
    "mc74hct245adtg.kicad_mod",
    "mc74hct245adtg.glb",
    "mc74hct245adtg.step",
    "mc74hct245adtg.lbr",
    "docs/hero.png",
    "docs/mc74hct245adtg-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mc74hct245adtg-hero.glb",
    "mc74hct245adtg-hero.overlay.json",
    "mc74hct245adtg-etched.glb"
  ],
  "component": {
    "mpn": "MC74HCT245ADTG",
    "manufacturer": "onsemi",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Logic ICs",
    "subcategory": "Buffers / Drivers",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/mc74hct245adt-d.pdf",
    "parts": {
      "symbol": "mc74hct245adtg.kicad_sym",
      "footprint": "mc74hct245adtg.kicad_mod",
      "model_3d": "mc74hct245adtg-hero.glb",
      "model_3d_plain": "mc74hct245adtg-etched.glb",
      "model_3d_step": "mc74hct245adtg-etched.step",
      "model_3d_step_plain": "mc74hct245adtg.step",
      "lbr": "mc74hct245adtg.lbr"
    },
    "distributor_links": {
      "lcsc": "C897449",
      "digikey": "MC74HCT245ADTG-ND",
      "mouser": "863-MC74HCT245ADTG"
    },
    "distributor_check": {
      "checked_at": "2026-10-29T02:14:43Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "MC74HCT245ADTG-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "863-MC74HCT245ADTG",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "DIRECTION",
        "type": "input",
        "description": "Direction control: when high, data flows from bus A to bus B; when low, data flows from bus B to bus A (per the function table)."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "bidirectional",
        "description": "Bus A data port bit 1; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "bidirectional",
        "description": "Bus A data port bit 2; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "4",
        "name": "A3",
        "type": "bidirectional",
        "description": "Bus A data port bit 3; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "5",
        "name": "A4",
        "type": "bidirectional",
        "description": "Bus A data port bit 4; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "6",
        "name": "A5",
        "type": "bidirectional",
        "description": "Bus A data port bit 5; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "7",
        "name": "A6",
        "type": "bidirectional",
        "description": "Bus A data port bit 6; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "8",
        "name": "A7",
        "type": "bidirectional",
        "description": "Bus A data port bit 7; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "9",
        "name": "A8",
        "type": "bidirectional",
        "description": "Bus A data port bit 8; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device; all voltages are referenced to this pin."
      },
      {
        "number": "11",
        "name": "B8",
        "type": "bidirectional",
        "description": "Bus B data port bit 8; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "12",
        "name": "B7",
        "type": "bidirectional",
        "description": "Bus B data port bit 7; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "13",
        "name": "B6",
        "type": "bidirectional",
        "description": "Bus B data port bit 6; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "14",
        "name": "B5",
        "type": "bidirectional",
        "description": "Bus B data port bit 5; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "15",
        "name": "B4",
        "type": "bidirectional",
        "description": "Bus B data port bit 4; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "16",
        "name": "B3",
        "type": "bidirectional",
        "description": "Bus B data port bit 3; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "17",
        "name": "B2",
        "type": "bidirectional",
        "description": "Bus B data port bit 2; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "18",
        "name": "B1",
        "type": "bidirectional",
        "description": "Bus B data port bit 1; Vin and Vout must be kept within GND to VCC, and unused I/O must be tied to GND or VCC if used as an input."
      },
      {
        "number": "19",
        "name": "OUTPUT ENABLE",
        "type": "input",
        "description": "Active-low output enable; when high, both data ports are isolated and placed in the high-impedance state."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, specified at 4.5 V to 5.5 V with respect to GND (recommended operating conditions)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The PIN ASSIGNMENT text on page 2 is garbled by text extraction (labels and numbers are out of order; The datasheet's pin descriptions are sparse; the bus-port descriptions reuse the datasheet's absolut; The ordering table lists the MC74HCT245ADTG as TSSOP-20 (DT suffix, case 948E), which matches the re"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0845,
        "at": "2026-10-29T02:14:22"
      },
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/mc74hct245adt-d.pdf",
        "pages": 10,
        "sha256": "49e7359a01dcc594",
        "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": "mc74hct245adtg.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": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mc74hct245adtg-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": "66369f189518890ccc66ca1351272493ba63aceb3b3b12f81fbd8fe52d3d4a47",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "TSSOP-20 (DT SUFFIX, CASE 948E-02)",
      "source_page": 9,
      "D": {
        "nom_mm": 6.6,
        "range_mm": [
          null,
          6.6
        ]
      },
      "E1": {
        "nom_mm": 4.4,
        "range_mm": [
          4.3,
          4.5
        ]
      },
      "E": {
        "nom_mm": 6.4,
        "range_mm": [
          null,
          null
        ]
      },
      "e": {
        "nom_mm": 0.65,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.2,
        "range_mm": [
          null,
          1.2
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "mc74hct245adtg.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}