main
Ray cd74hc4049nsr 0.1.1: pinout corrected (16 pins) a4b7e49 6h ago
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  "type": "component",
  "slug": "cd74hc4049nsr",
  "title": "CD74HC4049NSR",
  "brief": "Texas Instruments Buffers, Drivers, Receivers, Transceivers, SO-16. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.1",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "cd74hc4049nsr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CD74HC4049NSR",
    "manufacturer": "Texas Instruments",
    "package": "SO-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Buffers, Drivers, Receivers, Transceivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/cd74hc4050",
    "parts": {
      "symbol": "cd74hc4049nsr.kicad_sym",
      "footprint": "cd74hc4049nsr.kicad_mod",
      "model_3d": "cd74hc4049nsr-hero.glb",
      "model_3d_plain": "cd74hc4049nsr-etched.glb",
      "model_3d_step": "cd74hc4049nsr-etched.step",
      "model_3d_step_plain": "cd74hc4049nsr.step",
      "lbr": "cd74hc4049nsr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2870567",
      "digikey": "296-29273-2-ND",
      "mouser": "595-CD74HC4049NSR"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T09:51:30Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-29273-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-CD74HC4049NSR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, 2V to 6V operating for HC types (absolute max -0.5V to 7V); also sets the output logic level for level translation."
      },
      {
        "number": "2",
        "name": "1Y",
        "type": "output",
        "description": "Inverting buffer output 1 (Y = NOT 1A), output voltage 0V to VCC, \u00b125mA max DC output current, standard 10 LSTTL fanout."
      },
      {
        "number": "3",
        "name": "1A",
        "type": "input",
        "description": "Input to inverter 1 with modified input protection allowing high-to-low level translation; operating range 0V to 15V (absolute max 16V), independent of VCC."
      },
      {
        "number": "4",
        "name": "2Y",
        "type": "output",
        "description": "Inverting buffer output 2 (Y = NOT 2A), output voltage 0V to VCC, \u00b125mA max DC output current."
      },
      {
        "number": "5",
        "name": "2A",
        "type": "input",
        "description": "Input to inverter 2, level-translating input with an operating range of 0V to 15V (absolute max 16V)."
      },
      {
        "number": "6",
        "name": "3Y",
        "type": "output",
        "description": "Inverting buffer output 3 (Y = NOT 3A), output voltage 0V to VCC, \u00b125mA max DC output current."
      },
      {
        "number": "7",
        "name": "3A",
        "type": "input",
        "description": "Input to inverter 3, level-translating input with an operating range of 0V to 15V (absolute max 16V)."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; \u00b150mA max DC ground current."
      },
      {
        "number": "9",
        "name": "4A",
        "type": "input",
        "description": "Input to inverter 4, level-translating input with an operating range of 0V to 15V (absolute max 16V)."
      },
      {
        "number": "10",
        "name": "4Y",
        "type": "output",
        "description": "Inverting buffer output 4 (Y = NOT 4A), output voltage 0V to VCC, \u00b125mA max DC output current."
      },
      {
        "number": "11",
        "name": "5A",
        "type": "input",
        "description": "Input to inverter 5, level-translating input with an operating range of 0V to 15V (absolute max 16V)."
      },
      {
        "number": "12",
        "name": "5Y",
        "type": "output",
        "description": "Inverting buffer output 5 (Y = NOT 5A), output voltage 0V to VCC, \u00b125mA max DC output current."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "14",
        "name": "6A",
        "type": "input",
        "description": "Input to inverter 6, level-translating input with an operating range of 0V to 15V (absolute max 16V)."
      },
      {
        "number": "15",
        "name": "6Y",
        "type": "output",
        "description": "Inverting buffer output 6 (Y = NOT 6A), output voltage 0V to VCC, \u00b125mA max DC output current."
      },
      {
        "number": "16",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/cd74hc4050",
        "pages": 11,
        "sha256": "2d5643ffe4911f23",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      },
      "correction": {
        "at": "2026-10-22",
        "what": "16 of 16 pins corrected",
        "how": "pinout replaced from review decision: Opus 5.5 + Sonnet 5.5 agree on the whole pinout (two independent whole-datasheet reads) (both 5.5 models agree on all 16 pins; the original pair (opus matches neither side) is overruled); the previous pinout came from an earlier extraction",
        "symbol": "regenerated from the corrected pinout"
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cd74hc4049nsr.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": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cd74hc4049nsr-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": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "362e9e188c3cf789cebace126c0d22abf629b45368764927ec598fcea1a6c488",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SO-16",
      "Category": "Logic",
      "Pins": "16"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "2d5643ffe4911f23cc1789cfd8b92eb29ec118f00c051aad7efc5f56380cbbbd",
      "rows": [
        {
          "name": "DC Supply Voltage",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage Range",
          "symbol": "VI",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 16,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC Input Diode Current",
          "symbol": "IIK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -20,
          "typ": null,
          "max": null,
          "conditions": "For VI < -0.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC Output Diode Current",
          "symbol": "IOK",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -20,
          "typ": null,
          "max": 20,
          "conditions": "For VO < -0.5V or VO > VCC + 0.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC Output Source or Sink Current per Output Pin",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -25,
          "typ": null,
          "max": 25,
          "conditions": "For VO > -0.5V or VO < VCC + 0.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC VCC or Ground Current",
          "symbol": "ICC, IGND",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -50,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature (Plastic Package)",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "\u00b0C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "Plastic package",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "\u00b0C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Lead Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "\u00b0C",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "Soldering 10s",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature Range",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "\u00b0C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage Range",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": 6,
          "conditions": "HC Types",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC Input Voltage",
          "symbol": "VI",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 15,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC Output Voltage",
          "symbol": "VO",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 6,
          "conditions": "0V to VCC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Rise and Fall Time",
          "symbol": "tr, tf",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 1000,
          "conditions": "VCC = 2V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Rise and Fall Time",
          "symbol": "tr, tf",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "VCC = 4.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Rise and Fall Time",
          "symbol": "tr, tf",
          "kind": "recommended_operating",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "VCC = 6V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Impedance",
          "symbol": "\u03b8JA",
          "kind": "thermal",
          "unit": "\u00b0C/W",
          "min": null,
          "typ": 64,
          "max": null,
          "conditions": "NS (SOP) package, JESD 51-7",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": null,
          "max": null,
          "conditions": "VCC = 2V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.15,
          "typ": null,
          "max": null,
          "conditions": "VCC = 4.5V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.2,
          "typ": null,
          "max": null,
          "conditions": "VCC = 6V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "VCC = 2V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.35,
          "conditions": "VCC = 4.5V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Low Level Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.8,
          "conditions": "VCC = 6V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage CMOS Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.9,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL, IO = -0.02mA, VCC = 2V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage CMOS Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.4,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL, IO = -0.02mA, VCC = 4.5V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage CMOS Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5.9,
          "typ": null,
          "max": null,
          "conditions": "VI = VIH or VIL, IO = -0.02mA, VCC = 6V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage TTL Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.98,
          "typ": null,
          "max": null,
          "conditions": "IO = -4mA, VCC = 4.5V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
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        {
          "name": "High Level Output Voltage TTL Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 3.7,
          "typ": null,
          "max": null,
          "conditions": "IO = -4mA, VCC = 4.5V, -55\u00b0C to 125\u00b0C",
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          "source": "datasheet"
        },
        {
          "name": "High Level Output Voltage TTL Loads",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5.48,
          "typ": null,
          "max": null,
          "conditions": "IO = -5.2mA, VCC = 6V, 25\u00b0C",
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          "source": "datasheet"
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        {
          "name": "High Level Output Voltage TTL Loads",
          "symbol": "VOH",
          "kind": "electrical",
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          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage CMOS Loads",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "VI = VIH or VIL, IO = 0.02mA, VCC = 2V, 4.5V, 6V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage TTL Loads",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.26,
          "conditions": "IO = 4mA, VCC = 4.5V, 25\u00b0C",
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          "source": "datasheet"
        },
        {
          "name": "Low Level Output Voltage TTL Loads",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "IO = 4mA, VCC = 4.5V, -55\u00b0C to 125\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current",
          "symbol": "II",
          "kind": "electrical",
          "unit": "\u00b5A",
          "min": -0.1,
          "typ": null,
          "max": 0.1,
          "conditions": "VI = VCC or GND, VCC = 6V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current",
          "symbol": "II",
          "kind": "electrical",
          "unit": "\u00b5A",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "VI = 15V, VCC = 6V, -55\u00b0C to 125\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current",
          "symbol": "II",
          "kind": "electrical",
          "unit": "\u00b5A",
          "min": -0.5,
          "typ": null,
          "max": 0.5,
          "conditions": "VI = 15V, VCC = 6V, 25\u00b0C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Device Current",
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