SN74LS191N

{
  "slug": "sn74ls191n",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Counters, Dividers, PDIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "sn74ls191n",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74ls191n.kicad_sym",
    "sn74ls191n.kicad_mod",
    "sn74ls191n.glb",
    "sn74ls191n.step",
    "sn74ls191n.lbr",
    "docs/hero.png",
    "docs/sn74ls191n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74ls191n-hero.glb",
    "sn74ls191n-hero.overlay.json"
  ],
  "component": {
    "mpn": "SN74LS191N",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Counters, Dividers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/sn74ls191",
    "parts": {
      "symbol": "sn74ls191n.kicad_sym",
      "footprint": "sn74ls191n.kicad_mod",
      "model_3d": "sn74ls191n-hero.glb",
      "model_3d_step": "sn74ls191n-etched.step",
      "model_3d_step_plain": "sn74ls191n.step",
      "lbr": "sn74ls191n.lbr",
      "model_3d_plain": "sn74ls191n.glb"
    },
    "distributor_links": {
      "lcsc": "C1523316",
      "digikey": "2156-SN74LS191N-ND",
      "mouser": "595-SN74LS191N"
    },
    "distributor_check": {
      "checked_at": "2026-10-13T17:41:49Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-SN74LS191N-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-SN74LS191N",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "B",
        "type": "input",
        "description": "Parallel data input B, preset to the counter when LOAD is low."
      },
      {
        "number": "2",
        "name": "QB",
        "type": "output",
        "description": "Counter output QB."
      },
      {
        "number": "3",
        "name": "QA",
        "type": "output",
        "description": "Counter output QA."
      },
      {
        "number": "4",
        "name": "CTEN",
        "type": "input",
        "description": "Active-low count enable input; a high level inhibits counting, and changes should be made only when the clock is high."
      },
      {
        "number": "5",
        "name": "D/U",
        "type": "input",
        "description": "Down/up control input; low counts up and high counts down."
      },
      {
        "number": "6",
        "name": "QC",
        "type": "output",
        "description": "Counter output QC."
      },
      {
        "number": "7",
        "name": "QD",
        "type": "output",
        "description": "Counter output QD."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "9",
        "name": "D",
        "type": "input",
        "description": "Parallel data input D, preset to the counter when LOAD is low."
      },
      {
        "number": "10",
        "name": "C",
        "type": "input",
        "description": "Parallel data input C, preset to the counter when LOAD is low."
      },
      {
        "number": "11",
        "name": "LOAD",
        "type": "input",
        "description": "Active-low asynchronous load input that presets the outputs to the data inputs independently of the clock."
      },
      {
        "number": "12",
        "name": "MAX/MIN",
        "type": "output",
        "description": "Maximum/minimum count output that gives a high pulse about one clock cycle wide on overflow or underflow, for look-ahead cascading."
      },
      {
        "number": "13",
        "name": "RCO",
        "type": "output",
        "description": "Active-low ripple clock output that pulses low for the low portion of the clock on overflow or underflow, for cascading."
      },
      {
        "number": "14",
        "name": "CLK",
        "type": "input",
        "description": "Clock input; the counter advances on the low-to-high transition when enable is low."
      },
      {
        "number": "15",
        "name": "A",
        "type": "input",
        "description": "Parallel data input A, preset to the counter when LOAD is low."
      },
      {
        "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": "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": 28,
        "cost_usd": 0.2998,
        "at": "2026-10-13T17:40:53"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/sn74ls191",
        "pages": 28,
        "sha256": "0109f92d0857a924",
        "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": "sn74ls191n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          19.177,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "17a30b1f0ab3fd5384a1231e3c63c394888d5b952c542a8c189e023ed3467464",
        "checked": "2026-10-13",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74ls191n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          19.177,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4fcd04b53964c30e2bbbdf61720a8f6c0b45f66449de086c9a4ab9d952a0b2b2",
        "checked": "2026-10-13",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}