SN74LVC646ADBR

{
  "slug": "sn74lvc646adbr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Buffers, Drivers, Receivers, Transceivers, SSOP-24-150mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "sn74lvc646adbr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74lvc646adbr.kicad_sym",
    "sn74lvc646adbr.kicad_mod",
    "sn74lvc646adbr.glb",
    "sn74lvc646adbr.step",
    "sn74lvc646adbr.lbr",
    "docs/hero.png",
    "docs/sn74lvc646adbr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74lvc646adbr-hero.glb",
    "sn74lvc646adbr-hero.overlay.json"
  ],
  "component": {
    "mpn": "SN74LVC646ADBR",
    "manufacturer": "Texas Instruments",
    "package": "SSOP-24-150mil",
    "pin_count": 24,
    "category": "Logic",
    "subcategory": "Buffers, Drivers, Receivers, Transceivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/sn74lvc646a",
    "parts": {
      "symbol": "sn74lvc646adbr.kicad_sym",
      "footprint": "sn74lvc646adbr.kicad_mod",
      "model_3d": "sn74lvc646adbr-hero.glb",
      "model_3d_plain": "sn74lvc646adbr.glb",
      "model_3d_step": "sn74lvc646adbr-etched.step",
      "model_3d_step_plain": "sn74lvc646adbr.step",
      "lbr": "sn74lvc646adbr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2675933",
      "digikey": "296-8533-2-ND",
      "mouser": "595-SN74LVC646ADBR"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T09:15:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-8533-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-SN74LVC646ADBR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CLKAB",
        "type": "input",
        "description": "Clock input for the A-side registers; data on the A bus is stored on each low-to-high transition of CLKAB."
      },
      {
        "number": "2",
        "name": "SAB",
        "type": "input",
        "description": "Select control for the A-to-B path that multiplexes stored and real-time (transparent) data."
      },
      {
        "number": "3",
        "name": "DIR",
        "type": "input",
        "description": "Direction control that sets which bus receives data when OE is low (low selects B to A, high selects A to B)."
      },
      {
        "number": "4",
        "name": "A1",
        "type": "bidirectional",
        "description": "A-bus port 1 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "5",
        "name": "A2",
        "type": "bidirectional",
        "description": "A-bus port 2 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "6",
        "name": "A3",
        "type": "bidirectional",
        "description": "A-bus port 3 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "7",
        "name": "A4",
        "type": "bidirectional",
        "description": "A-bus port 4 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "8",
        "name": "A5",
        "type": "bidirectional",
        "description": "A-bus port 5 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "9",
        "name": "A6",
        "type": "bidirectional",
        "description": "A-bus port 6 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "10",
        "name": "A7",
        "type": "bidirectional",
        "description": "A-bus port 7 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "11",
        "name": "A8",
        "type": "bidirectional",
        "description": "A-bus port 8 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; all unused inputs must be held at VCC or GND for proper device operation."
      },
      {
        "number": "13",
        "name": "B8",
        "type": "bidirectional",
        "description": "B-bus port 8 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "14",
        "name": "B7",
        "type": "bidirectional",
        "description": "B-bus port 7 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "15",
        "name": "B6",
        "type": "bidirectional",
        "description": "B-bus port 6 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "16",
        "name": "B5",
        "type": "bidirectional",
        "description": "B-bus port 5 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "17",
        "name": "B4",
        "type": "bidirectional",
        "description": "B-bus port 4 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "18",
        "name": "B3",
        "type": "bidirectional",
        "description": "B-bus port 3 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "19",
        "name": "B2",
        "type": "bidirectional",
        "description": "B-bus port 2 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "20",
        "name": "B1",
        "type": "bidirectional",
        "description": "B-bus port 1 data input/output; the 3-state output is active only when OE is low and DIR selects it, and inputs accept up to 5.5 V."
      },
      {
        "number": "21",
        "name": "OE",
        "type": "input",
        "description": "Active-low output enable; OE high places the A and B outputs in the high-impedance (isolation) state, and it should be tied to VCC through a pullup resistor to keep outputs high-impedance during power up or down."
      },
      {
        "number": "22",
        "name": "SBA",
        "type": "input",
        "description": "Select control for the B-to-A path that multiplexes stored and real-time (transparent) data."
      },
      {
        "number": "23",
        "name": "CLKBA",
        "type": "input",
        "description": "Clock input for the B-side registers; data on the B bus is stored on each low-to-high transition of CLKBA."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; the SN74LVC646A is specified for 1.65 V to 3.6 V operation (operating range)."
      }
    ],
    "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-diagram text extraction is garbled. The pin-number mapping was rebuilt from the top-view pin; Page 4 states that the pin numbers apply to the DB, DW, JT, NS, PW and W packages, so the same numbe; The datasheet gives the package as DB, a 24-pin SSOP plastic small-outline package, but it does not "
        ],
        "pages_sent": 21,
        "cost_usd": 0.0819,
        "at": "2026-10-11T09:14:55"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/sn74lvc646a",
        "pages": 21,
        "sha256": "979e7f444477033e",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 24,
        "described": 24,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "sn74lvc646adbr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.8,
          8.2,
          2.1
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "77dd0a1fc7e70e9eda1bfde9dde937dc6e391803cff9978790523c850c85a21d",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74lvc646adbr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          2.1
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "12e01b72fef5e687768ca38cf10d21d47fecf58cb18e9c7c0b429aa8cd5f2607",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}