74HC21D

{
  "schema_version": 1,
  "type": "component",
  "slug": "74hc21d",
  "title": "74HC21D",
  "brief": "Nexperia Gates, SOIC-14. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "logic",
    "74hc21d"
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  "component": {
    "mpn": "74HC21D",
    "manufacturer": "Nexperia",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Logic",
    "subcategory": "Gates",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74HC21D.pdf",
    "parts": {
      "symbol": "74hc21d.kicad_sym",
      "footprint": "74hc21d.kicad_mod",
      "model_3d": "74hc21d-etched.glb",
      "model_3d_plain": "74hc21d.glb",
      "model_3d_step": "74hc21d-etched.step",
      "model_3d_step_plain": "74hc21d.step",
      "lbr": "74hc21d.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "1A",
        "type": "input",
        "description": "Data input A of AND gate 1. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "2",
        "name": "1B",
        "type": "input",
        "description": "Data input B of AND gate 1. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "3",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected. Leave floating or tie to a defined potential; no internal bond."
      },
      {
        "number": "4",
        "name": "1C",
        "type": "input",
        "description": "Data input C of AND gate 1. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "5",
        "name": "1D",
        "type": "input",
        "description": "Data input D of AND gate 1. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "6",
        "name": "1Y",
        "type": "output",
        "description": "Data output of AND gate 1 (1Y = 1A · 1B · 1C · 1D). Push-pull CMOS output, ±25 mA absolute maximum."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "8",
        "name": "2Y",
        "type": "output",
        "description": "Data output of AND gate 2 (2Y = 2A · 2B · 2C · 2D). Push-pull CMOS output, ±25 mA absolute maximum."
      },
      {
        "number": "9",
        "name": "2A",
        "type": "input",
        "description": "Data input A of AND gate 2. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "10",
        "name": "2B",
        "type": "input",
        "description": "Data input B of AND gate 2. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "11",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected. Leave floating or tie to a defined potential; no internal bond."
      },
      {
        "number": "12",
        "name": "2C",
        "type": "input",
        "description": "Data input C of AND gate 2. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "13",
        "name": "2D",
        "type": "input",
        "description": "Data input D of AND gate 2. CMOS input level referenced to V_CC; includes input clamp diode."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 2.0 V to 6.0 V (5.0 V typ). Absolute max 7 V. Bypass locally to GND with a 100 nF ceramic capacitor."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74HC21D.pdf",
        "pages": 11,
        "sha256": "1f36967884668dca",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "logic": {
      "family_id": "74HC21",
      "logic_family": "74HC",
      "function_code": "21",
      "function_class": "Gate",
      "function_name": "Dual 4-Input AND Gate",
      "manufacturer": null,
      "is_specialty": false
    },
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          8.7,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74hc21d-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          1.75
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5537877619640dd98b3a8375bd2aa6d15044f729818eba1b261176c6148c1257",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "SOIC-14",
      "Category": "Logic",
      "Pins": "14"
    }
  },
  "variants": [
    {
      "mpn": "74HC21DD",
      "kind": "packaging"
    },
    {
      "mpn": "74HC21DPW",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "74hc21d"
  ],
  "discovery_pitch": "74HC21D (Nexperia) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "74hc21d.kicad_sym",
    "74hc21d.kicad_mod",
    "74hc21d.glb",
    "74hc21d.step",
    "74hc21d.lbr",
    "docs/hero.png",
    "docs/74hc21d-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T14:56:09.457Z"
}