SN74LS194AD

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74ls194ad",
  "title": "SN74LS194AD",
  "brief": "Texas Instruments Shift Registers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "sn74ls194ad",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "SN74LS194AD",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Shift Registers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/49c55636fc4d3d4790546c377ace541b.pdf",
    "parts": {
      "symbol": "sn74ls194ad.kicad_sym",
      "footprint": "sn74ls194ad.kicad_mod",
      "model_3d": "sn74ls194ad-hero.glb",
      "model_3d_plain": "sn74ls194ad-etched.glb",
      "model_3d_step": "sn74ls194ad-etched.step",
      "model_3d_step_plain": "sn74ls194ad.step",
      "lbr": "sn74ls194ad.lbr"
    },
    "distributor_links": {
      "lcsc": "C2864014",
      "digikey": "296-33975-5-ND",
      "mouser": "595-SN74LS194AD"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T05:51:51Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-33975-5-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-SN74LS194AD",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CLR",
        "type": "input",
        "description": "Direct overriding clear input (active low) that forces all outputs QA-QD low."
      },
      {
        "number": "2",
        "name": "SR SER",
        "type": "input",
        "description": "Shift-right serial data input, entered when S0 is high and S1 is low."
      },
      {
        "number": "3",
        "name": "A",
        "type": "input",
        "description": "Parallel data input A, loaded into QA when S0 and S1 are both high."
      },
      {
        "number": "4",
        "name": "B",
        "type": "input",
        "description": "Parallel data input B, loaded into QB when S0 and S1 are both high."
      },
      {
        "number": "5",
        "name": "C",
        "type": "input",
        "description": "Parallel data input C, loaded into QC when S0 and S1 are both high."
      },
      {
        "number": "6",
        "name": "D",
        "type": "input",
        "description": "Parallel data input D, loaded into QD when S0 and S1 are both high."
      },
      {
        "number": "7",
        "name": "SL SER",
        "type": "input",
        "description": "Shift-left serial data input, entered when S0 is low and S1 is high."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "9",
        "name": "S0",
        "type": "input",
        "description": "Mode control input S0; with S1 selects hold, shift right, shift left or parallel load."
      },
      {
        "number": "10",
        "name": "S1",
        "type": "input",
        "description": "Mode control input S1; with S0 selects hold, shift right, shift left or parallel load."
      },
      {
        "number": "11",
        "name": "CLK",
        "type": "input",
        "description": "Clock input; positive edge-triggered, and clocking is inhibited when both S0 and S1 are low."
      },
      {
        "number": "12",
        "name": "QD",
        "type": "output",
        "description": "Parallel output D (last stage of the register)."
      },
      {
        "number": "13",
        "name": "QC",
        "type": "output",
        "description": "Parallel output C."
      },
      {
        "number": "14",
        "name": "QB",
        "type": "output",
        "description": "Parallel output B."
      },
      {
        "number": "15",
        "name": "QA",
        "type": "output",
        "description": "Parallel output A (first stage of the register)."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage."
      }
    ],
    "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 descriptions are derived from the pinout, logic symbol and function table; the electrical limits",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 12,
        "cost_usd": 0.121,
        "at": "2026-10-18T05:50:36"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/49c55636fc4d3d4790546c377ace541b.pdf",
        "pages": 15,
        "sha256": "999e3f51dc7bddfe",
        "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": "sn74ls194ad.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74ls194ad-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "147ff28b1354318e6de09432b4e9180d50903dde148205e8f5e681c8b1d8155b",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-16",
      "Category": "Logic",
      "Pins": "16"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn74ls194ad"
  ],
  "discovery_pitch": "SN74LS194AD (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "sn74ls194ad.kicad_sym",
    "sn74ls194ad.kicad_mod",
    "sn74ls194ad.glb",
    "sn74ls194ad.step",
    "sn74ls194ad.lbr",
    "docs/hero.png",
    "docs/sn74ls194ad-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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    "sn74ls194ad-hero.overlay.json",
    "sn74ls194ad-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}