CD74HC251M96

{
  "slug": "cd74hc251m96",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "cd74hc251m96",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cd74hc251m96.kicad_sym",
    "cd74hc251m96.kicad_mod",
    "cd74hc251m96.glb",
    "cd74hc251m96.step",
    "cd74hc251m96.lbr",
    "docs/hero.png",
    "docs/cd74hc251m96-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cd74hc251m96-hero.glb",
    "cd74hc251m96-hero.overlay.json"
  ],
  "component": {
    "mpn": "CD74HC251M96",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.ti.com/cn/lit/gpn/cd74hct251",
    "parts": {
      "symbol": "cd74hc251m96.kicad_sym",
      "footprint": "cd74hc251m96.kicad_mod",
      "model_3d": "cd74hc251m96-hero.glb",
      "model_3d_plain": "cd74hc251m96.glb",
      "model_3d_step": "cd74hc251m96-etched.step",
      "model_3d_step_plain": "cd74hc251m96.step",
      "lbr": "cd74hc251m96.lbr"
    },
    "distributor_links": {
      "lcsc": "C2674725",
      "digikey": "2156-CD74HC251M96-HCTR-ND",
      "mouser": "595-CD74HC251M96"
    },
    "distributor_check": {
      "checked_at": "2026-10-12T04:42:37Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-CD74HC251M96-HCTR-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "595-CD74HC251M96",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "I3",
        "type": "input",
        "description": "Data input 3, routed to Y and Y-bar when select code S2S1S0 = LHH and OE is low."
      },
      {
        "number": "2",
        "name": "I2",
        "type": "input",
        "description": "Data input 2, routed to Y and Y-bar when select code S2S1S0 = LHL and OE is low."
      },
      {
        "number": "3",
        "name": "I1",
        "type": "input",
        "description": "Data input 1, routed to Y and Y-bar when select code S2S1S0 = LLH and OE is low."
      },
      {
        "number": "4",
        "name": "I0",
        "type": "input",
        "description": "Data input 0, routed to Y and Y-bar when select code S2S1S0 = LLL and OE is low."
      },
      {
        "number": "5",
        "name": "Y",
        "type": "tri_state",
        "description": "True three-state output that follows the selected data input and is high-impedance when OE is high."
      },
      {
        "number": "6",
        "name": "Y̅",
        "type": "tri_state",
        "description": "Complementary three-state output that is the inverse of the selected data input and is high-impedance when OE is high."
      },
      {
        "number": "7",
        "name": "OE̅",
        "type": "input",
        "description": "Active-low output enable; must be low to enable the device and puts both outputs in high-impedance when high."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "9",
        "name": "S2",
        "type": "input",
        "description": "Data select input, most significant bit of the 3-bit address that selects one of eight data inputs."
      },
      {
        "number": "10",
        "name": "S1",
        "type": "input",
        "description": "Data select input, middle bit of the 3-bit address that selects one of eight data inputs."
      },
      {
        "number": "11",
        "name": "S0",
        "type": "input",
        "description": "Data select input, least significant bit of the 3-bit address that selects one of eight data inputs."
      },
      {
        "number": "12",
        "name": "I7",
        "type": "input",
        "description": "Data input 7, routed to Y and Y-bar when select code S2S1S0 = HHH and OE is low."
      },
      {
        "number": "13",
        "name": "I6",
        "type": "input",
        "description": "Data input 6, routed to Y and Y-bar when select code S2S1S0 = HHL and OE is low."
      },
      {
        "number": "14",
        "name": "I5",
        "type": "input",
        "description": "Data input 5, routed to Y and Y-bar when select code S2S1S0 = HLH and OE is low."
      },
      {
        "number": "15",
        "name": "I4",
        "type": "input",
        "description": "Data input 4, routed to Y and Y-bar when select code S2S1S0 = HLL and OE is low."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 2 V to 6 V for HC types, with a 0.1-uF bypass capacitor recommended."
      }
    ],
    "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": 21,
        "cost_usd": 0.3997,
        "at": "2026-10-12T04:42:21"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/cd74hct251",
        "pages": 21,
        "sha256": "fc13f4be219dfc83",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cd74hc251m96.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
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          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-12",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cd74hc251m96-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "sha256": "e464b1d9f21138ed039b20e3593940a210e2af7f1eb02b67dbb200871a4f5d40",
        "checked": "2026-10-12",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}