SN74HC245

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc245",
  "title": "SN74HC245",
  "brief": "TI octal bus transceiver with 3-state outputs, SOIC-20. Direction + output-enable, 8 channels, 2-6 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "bus-transceiver",
    "buffer",
    "74hc",
    "soic-20",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN74HC245",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-20",
    "pin_count": 20,
    "category": "Logic IC",
    "subcategory": "Octal bus transceiver (3-state)",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc245.pdf",
    "parts": {
      "symbol": "sn74hc245.kicad_sym",
      "footprint": "sn74hc245.kicad_mod",
      "model_3d": "sn74hc245-etched.glb",
      "model_3d_plain": "sn74hc245.glb",
      "lbr": "sn74hc245.lbr",
      "model_3d_step": "sn74hc245-etched.step",
      "model_3d_step_plain": "sn74hc245.step"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "DIR",
        "type": "input",
        "description": "Direction control input. When DIR is high, data flows from A bus to B bus; when low, data flows from B bus to A bus. CMOS logic input, held at VCC or GND per recommended operating conditions."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "bidirectional",
        "description": "Channel 1 A-side data pin. Acts as input when DIR is high (transmits to B1) or output when DIR is low (driven by B1). High-impedance when OE is high."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "bidirectional",
        "description": "Channel 2 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "4",
        "name": "A3",
        "type": "bidirectional",
        "description": "Channel 3 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "5",
        "name": "A4",
        "type": "bidirectional",
        "description": "Channel 4 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "6",
        "name": "A5",
        "type": "bidirectional",
        "description": "Channel 5 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "7",
        "name": "A6",
        "type": "bidirectional",
        "description": "Channel 6 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "8",
        "name": "A7",
        "type": "bidirectional",
        "description": "Channel 7 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "9",
        "name": "A8",
        "type": "bidirectional",
        "description": "Channel 8 A-side data pin. Bidirectional; direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V). Return path for VCC supply current and signal reference."
      },
      {
        "number": "11",
        "name": "B8",
        "type": "bidirectional",
        "description": "Channel 8 B-side data pin. Bidirectional; paired with A8. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "12",
        "name": "B7",
        "type": "bidirectional",
        "description": "Channel 7 B-side data pin. Bidirectional; paired with A7. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "13",
        "name": "B6",
        "type": "bidirectional",
        "description": "Channel 6 B-side data pin. Bidirectional; paired with A6. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "14",
        "name": "B5",
        "type": "bidirectional",
        "description": "Channel 5 B-side data pin. Bidirectional; paired with A5. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "15",
        "name": "B4",
        "type": "bidirectional",
        "description": "Channel 4 B-side data pin. Bidirectional; paired with A4. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "16",
        "name": "B3",
        "type": "bidirectional",
        "description": "Channel 3 B-side data pin. Bidirectional; paired with A3. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "17",
        "name": "B2",
        "type": "bidirectional",
        "description": "Channel 2 B-side data pin. Bidirectional; paired with A2. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "18",
        "name": "B1",
        "type": "bidirectional",
        "description": "Channel 1 B-side data pin. Bidirectional; paired with A1. Direction set by DIR, enabled by OE (active-low)."
      },
      {
        "number": "19",
        "name": "OE",
        "type": "input",
        "description": "Active-low output enable. When OE is low, transceivers are enabled per DIR; when OE is high, all A and B pins are placed in high-impedance (isolation) state. Should be tied to VCC through a pullup resistor during power-up/down to guarantee high-Z."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply pin. Recommended operating range 2 V to 6 V (5 V nominal). Bypass with 0.1 uF ceramic capacitor to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hc245.pdf",
        "pages": 35,
        "sha256": "c78c3a1bb10a438d",
        "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"
    },
    "logic": {
      "family_id": "74HC245",
      "logic_family": "74HC",
      "function_code": "245",
      "function_class": "Transceiver",
      "function_name": "Octal Bus Transceiver, 3-State",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
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        "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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc245-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          2.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c27a790d468ed1e6446031986a16d21fb10ad15693c0f0d691aca87379fcb160",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Octal bus transceiver, 3-state",
      "Channels": "8 (A1-A8 <-> B1-B8)",
      "Direction": "DIR pin (A->B high, B->A low)",
      "Output enable": "/OE (active-low, Hi-Z)",
      "Logic family": "HC (high-speed CMOS)",
      "Supply voltage": "2-6 V",
      "Package": "SOIC-20",
      "Body (L×W×H)": "12.8 × 7.5 × 2.35 mm"
    }
  },
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  "discovery_triggers": [
    "sn74hc245",
    "74hc245",
    "octal bus transceiver",
    "3-state buffer",
    "bidirectional buffer"
  ],
  "discovery_pitch": "SN74HC245 octal bus transceiver with 3-state outputs (SOIC-20) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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  "variants": [
    {
      "mpn": "SN74HC245DW (SOIC-20, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC245DWR (SOIC-20, tape & reel)",
      "kind": "packaging"
    }
  ]
}