74HCT245PW

{
  "schema_version": 1,
  "type": "component",
  "slug": "74hct245pw",
  "title": "74HCT245PW",
  "brief": "Nexperia Buffer/Driver/Transceiver, TSSOP-20. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "74hct245pw"
  ],
  "component": {
    "mpn": "74HCT245PW",
    "manufacturer": "Nexperia",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Logic",
    "subcategory": "Buffer/Driver/Transceiver",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74HCT245PW.pdf",
    "parts": {
      "symbol": "74hct245pw.kicad_sym",
      "footprint": "74hct245pw.kicad_mod",
      "model_3d": "74hct245pw-etched.glb",
      "model_3d_plain": "74hct245pw.glb",
      "model_3d_step": "74hct245pw-etched.step",
      "model_3d_step_plain": "74hct245pw.step",
      "lbr": "74hct245pw.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "DIR",
        "type": "input",
        "description": "Direction control input. LOW = data flows B→A (B ports are inputs, A ports are outputs); HIGH = data flows A→B (A ports are inputs, B ports are outputs). TTL-level input."
      },
      {
        "number": "2",
        "name": "A0",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 0 on the A-side bus. Acts as input or 3-state output depending on DIR and OE."
      },
      {
        "number": "3",
        "name": "A1",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 1 on the A-side bus."
      },
      {
        "number": "4",
        "name": "A2",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 2 on the A-side bus."
      },
      {
        "number": "5",
        "name": "A3",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 3 on the A-side bus."
      },
      {
        "number": "6",
        "name": "A4",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 4 on the A-side bus."
      },
      {
        "number": "7",
        "name": "A5",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 5 on the A-side bus."
      },
      {
        "number": "8",
        "name": "A6",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 6 on the A-side bus."
      },
      {
        "number": "9",
        "name": "A7",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 7 on the A-side bus."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V). Connect to system ground."
      },
      {
        "number": "11",
        "name": "B7",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 7 on the B-side bus."
      },
      {
        "number": "12",
        "name": "B6",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 6 on the B-side bus."
      },
      {
        "number": "13",
        "name": "B5",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 5 on the B-side bus."
      },
      {
        "number": "14",
        "name": "B4",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 4 on the B-side bus."
      },
      {
        "number": "15",
        "name": "B3",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 3 on the B-side bus."
      },
      {
        "number": "16",
        "name": "B2",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 2 on the B-side bus."
      },
      {
        "number": "17",
        "name": "B1",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 1 on the B-side bus."
      },
      {
        "number": "18",
        "name": "B0",
        "type": "bidirectional",
        "description": "Bidirectional data I/O bit 0 on the B-side bus."
      },
      {
        "number": "19",
        "name": "OE",
        "type": "input",
        "description": "Output enable, active LOW. LOW enables the transceiver in the direction set by DIR; HIGH places both A and B ports in high-impedance (3-state) OFF condition."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage. Recommended operating range 4.5 V to 5.5 V for 74HCT245 (TTL-input variant); absolute max 7 V. Decouple with a 100 nF ceramic capacitor to GND close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74HCT245PW.pdf",
        "pages": 15,
        "sha256": "ff2562c806a0fc87",
        "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.8625,
        -2.925
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "TSSOP-20_4.4x6.5mm_P0.65mm@sha256:b7ca3a31dd45c122",
      "mark": "drawn"
    },
    "logic": {
      "family_id": "74HCT245",
      "logic_family": "74HCT",
      "function_code": "245",
      "function_class": "Transceiver",
      "function_name": "Octal Bus Transceiver, 3-State",
      "manufacturer": null,
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "74hct245pw.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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74hct245pw-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": "4480d13d7c5b79a238c4b4583b5ba1e41f9d0f88e40544287203ad4b4cd01f05",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "TSSOP-20",
      "Category": "Logic",
      "Pins": "20"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "74hct245pw"
  ],
  "discovery_pitch": "74HCT245PW (Nexperia) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74hct245pw.kicad_sym",
    "74hct245pw.kicad_mod",
    "74hct245pw.glb",
    "74hct245pw.step",
    "74hct245pw-etched.step",
    "74hct245pw.lbr",
    "docs/hero.png",
    "docs/74hct245pw-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T15:05:27.766Z"
}