CD74AC273E

{
  "slug": "cd74ac273e",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Flip Flops, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic ics",
    "cd74ac273e",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
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    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "cd74ac273e.kicad_sym",
    "cd74ac273e.kicad_mod",
    "cd74ac273e.glb",
    "cd74ac273e.step",
    "cd74ac273e.lbr",
    "docs/hero.png",
    "docs/cd74ac273e-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cd74ac273e-hero.glb",
    "cd74ac273e-hero.overlay.json",
    "cd74ac273e-etched.glb"
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  "component": {
    "mpn": "CD74AC273E",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-20",
    "pin_count": 20,
    "category": "Logic ICs",
    "subcategory": "Flip Flops",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd74ac273e.pdf",
    "parts": {
      "symbol": "cd74ac273e.kicad_sym",
      "footprint": "cd74ac273e.kicad_mod",
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      "model_3d_plain": "cd74ac273e-etched.glb",
      "model_3d_step": "cd74ac273e-etched.step",
      "model_3d_step_plain": "cd74ac273e.step",
      "lbr": "cd74ac273e.lbr"
    },
    "distributor_links": {
      "lcsc": "C1550143",
      "digikey": "2156-CD74AC273E-ND",
      "mouser": "595-CD74AC273E"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T22:32:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-CD74AC273E-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-CD74AC273E",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "MR",
        "type": "input",
        "description": "Active-low common reset; a low voltage level resets all eight flip-flops independent of the clock."
      },
      {
        "number": "2",
        "name": "Q0",
        "type": "output",
        "description": "Output of flip-flop 0, which takes the level of D0 on the positive-going clock edge."
      },
      {
        "number": "3",
        "name": "D0",
        "type": "input",
        "description": "Data input to flip-flop 0, transferred to Q0 on the positive-going edge of CP."
      },
      {
        "number": "4",
        "name": "D1",
        "type": "input",
        "description": "Data input to flip-flop 1, transferred to Q1 on the positive-going edge of CP."
      },
      {
        "number": "5",
        "name": "Q1",
        "type": "output",
        "description": "Output of flip-flop 1, which takes the level of D1 on the positive-going clock edge."
      },
      {
        "number": "6",
        "name": "Q2",
        "type": "output",
        "description": "Output of flip-flop 2, which takes the level of D2 on the positive-going clock edge."
      },
      {
        "number": "7",
        "name": "D2",
        "type": "input",
        "description": "Data input to flip-flop 2, transferred to Q2 on the positive-going edge of CP."
      },
      {
        "number": "8",
        "name": "D3",
        "type": "input",
        "description": "Data input to flip-flop 3, transferred to Q3 on the positive-going edge of CP."
      },
      {
        "number": "9",
        "name": "Q3",
        "type": "output",
        "description": "Output of flip-flop 3, which takes the level of D3 on the positive-going clock edge."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; all voltages in the datasheet are referenced to this pin."
      },
      {
        "number": "11",
        "name": "CP",
        "type": "input",
        "description": "Common clock input; data at Dn is transferred to Qn on its positive-going edge."
      },
      {
        "number": "12",
        "name": "Q4",
        "type": "output",
        "description": "Output of flip-flop 4, which takes the level of D4 on the positive-going clock edge."
      },
      {
        "number": "13",
        "name": "D4",
        "type": "input",
        "description": "Data input to flip-flop 4, transferred to Q4 on the positive-going edge of CP."
      },
      {
        "number": "14",
        "name": "D5",
        "type": "input",
        "description": "Data input to flip-flop 5, transferred to Q5 on the positive-going edge of CP."
      },
      {
        "number": "15",
        "name": "Q5",
        "type": "output",
        "description": "Output of flip-flop 5, which takes the level of D5 on the positive-going clock edge."
      },
      {
        "number": "16",
        "name": "Q6",
        "type": "output",
        "description": "Output of flip-flop 6, which takes the level of D6 on the positive-going clock edge."
      },
      {
        "number": "17",
        "name": "D6",
        "type": "input",
        "description": "Data input to flip-flop 6, transferred to Q6 on the positive-going edge of CP."
      },
      {
        "number": "18",
        "name": "D7",
        "type": "input",
        "description": "Data input to flip-flop 7, transferred to Q7 on the positive-going edge of CP."
      },
      {
        "number": "19",
        "name": "Q7",
        "type": "output",
        "description": "Output of flip-flop 7, which takes the level of D7 on the positive-going clock edge."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; the AC types operate from 1.5V to 5.5V and the ACT types from 4.5V to 5.5V."
      }
    ],
    "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 numbers were reconstructed from a column-scrambled text extraction of the page 1 pinout diag"
        ],
        "pages_sent": 25,
        "cost_usd": 0.0281,
        "at": "2026-10-30T22:32:29"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd74ac273e.pdf",
        "pages": 25,
        "sha256": "5018ac9c7af730f1",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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          26.162,
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        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ca359c9b9e0ce94efcb6c96866513f659eef6517d629ace3c4a0a779f6fd57bb",
        "checked": "2026-10-30",
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  }
}