MC74AC157DR2G

{
  "slug": "mc74ac157dr2g",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "mc74ac157dr2g",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mc74ac157dr2g.kicad_sym",
    "mc74ac157dr2g.kicad_mod",
    "mc74ac157dr2g.glb",
    "mc74ac157dr2g.step",
    "mc74ac157dr2g.lbr",
    "docs/hero.png",
    "docs/mc74ac157dr2g-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mc74ac157dr2g-hero.glb",
    "mc74ac157dr2g-hero.overlay.json",
    "mc74ac157dr2g-etched.glb"
  ],
  "component": {
    "mpn": "MC74AC157DR2G",
    "manufacturer": "onsemi",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/73b647b4966233af284a9fd8df8d30b0.pdf",
    "parts": {
      "symbol": "mc74ac157dr2g.kicad_sym",
      "footprint": "mc74ac157dr2g.kicad_mod",
      "model_3d": "mc74ac157dr2g-hero.glb",
      "model_3d_plain": "mc74ac157dr2g-etched.glb",
      "model_3d_step": "mc74ac157dr2g-etched.step",
      "model_3d_step_plain": "mc74ac157dr2g.step",
      "lbr": "mc74ac157dr2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C903969",
      "mouser": "863-MC74AC157DR2G"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T20:36:49Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": "863-MC74AC157DR2G",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "S",
        "type": "input",
        "description": "Common Select input that chooses between the I0 sources (S LOW) and the I1 sources (S HIGH) for all four outputs."
      },
      {
        "number": "2",
        "name": "I0a",
        "type": "input",
        "description": "Source 0 data input for multiplexer channel a, passed to Za when E is LOW and S is LOW."
      },
      {
        "number": "3",
        "name": "I1a",
        "type": "input",
        "description": "Source 1 data input for multiplexer channel a, passed to Za when E is LOW and S is HIGH."
      },
      {
        "number": "4",
        "name": "Za",
        "type": "output",
        "description": "Channel a output presenting the selected data in true (non-inverted) form, forced LOW when E is HIGH, with 24 mA source/sink capability."
      },
      {
        "number": "5",
        "name": "I0b",
        "type": "input",
        "description": "Source 0 data input for multiplexer channel b, passed to Zb when E is LOW and S is LOW."
      },
      {
        "number": "6",
        "name": "I1b",
        "type": "input",
        "description": "Source 1 data input for multiplexer channel b, passed to Zb when E is LOW and S is HIGH."
      },
      {
        "number": "7",
        "name": "Zb",
        "type": "output",
        "description": "Channel b output presenting the selected data in true (non-inverted) form, forced LOW when E is HIGH, with 24 mA source/sink capability."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "9",
        "name": "Zd",
        "type": "output",
        "description": "Channel d output presenting the selected data in true (non-inverted) form, forced LOW when E is HIGH, with 24 mA source/sink capability."
      },
      {
        "number": "10",
        "name": "I1d",
        "type": "input",
        "description": "Source 1 data input for multiplexer channel d, passed to Zd when E is LOW and S is HIGH."
      },
      {
        "number": "11",
        "name": "I0d",
        "type": "input",
        "description": "Source 0 data input for multiplexer channel d, passed to Zd when E is LOW and S is LOW."
      },
      {
        "number": "12",
        "name": "Zc",
        "type": "output",
        "description": "Channel c output presenting the selected data in true (non-inverted) form, forced LOW when E is HIGH, with 24 mA source/sink capability."
      },
      {
        "number": "13",
        "name": "I1c",
        "type": "input",
        "description": "Source 1 data input for multiplexer channel c, passed to Zc when E is LOW and S is HIGH."
      },
      {
        "number": "14",
        "name": "I0c",
        "type": "input",
        "description": "Source 0 data input for multiplexer channel c, passed to Zc when E is LOW and S is LOW."
      },
      {
        "number": "15",
        "name": "E",
        "type": "input",
        "description": "Active-LOW Enable input; when E is HIGH all four outputs Z are forced LOW regardless of the other inputs."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, 2.0 V to 6.0 V recommended for AC and 4.5 V to 5.5 V for ACT, with an absolute maximum of -0.5 V to +7.0 V."
      }
    ],
    "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": "vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin numbers and names were read from the Figure 1 pinout image on page 1, since the datasheet has no; The PIN NAMES table lists I1a-I1d as 'Source 0 Data Inputs', which looks like a typo for source 1. T",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 9,
        "cost_usd": 0.1176,
        "at": "2026-10-21T20:31:53"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/73b647b4966233af284a9fd8df8d30b0.pdf",
        "pages": 9,
        "sha256": "f7e74d0c50731c2e",
        "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": [
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        "file": "mc74ac157dr2g.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mc74ac157dr2g-etched.step",
        "role": "eda",
        "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": "3caf32fa4d3a145fe164408f367d44328ad0e2b73386934535aacb6fb5741742",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}