74HC74D

{
  "schema_version": 1,
  "type": "component",
  "slug": "74hc74d",
  "title": "74HC74D",
  "brief": "Nexperia Flip Flops, SOIC-14. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "74hc74d"
  ],
  "component": {
    "mpn": "74HC74D",
    "manufacturer": "Nexperia",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Logic",
    "subcategory": "Flip Flops",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74HC74D.pdf",
    "parts": {
      "symbol": "74hc74d.kicad_sym",
      "footprint": "74hc74d.kicad_mod",
      "model_3d": "74hc74d-etched.glb",
      "model_3d_plain": "74hc74d.glb",
      "model_3d_step": "74hc74d-etched.step",
      "model_3d_step_plain": "74hc74d.step",
      "lbr": "74hc74d.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "1RD",
        "type": "input",
        "description": "Flip-flop 1 asynchronous reset-direct input (active LOW). Drives 1Q LOW / 1Q-bar HIGH independent of clock when asserted."
      },
      {
        "number": "2",
        "name": "1D",
        "type": "input",
        "description": "Flip-flop 1 data input. Value present at 1D at the LOW-to-HIGH transition of 1CP (meeting setup/hold) is stored and appears at 1Q."
      },
      {
        "number": "3",
        "name": "1CP",
        "type": "input",
        "description": "Flip-flop 1 clock input, positive edge-triggered (LOW-to-HIGH). Schmitt-trigger action makes it tolerant of slow clock rise/fall times."
      },
      {
        "number": "4",
        "name": "1SD",
        "type": "input",
        "description": "Flip-flop 1 asynchronous set-direct input (active LOW). Drives 1Q HIGH / 1Q-bar LOW independent of clock when asserted."
      },
      {
        "number": "5",
        "name": "1Q",
        "type": "output",
        "description": "Flip-flop 1 true output. Reflects the state stored on the previous LOW-to-HIGH transition of 1CP, or is forced by 1SD/1RD."
      },
      {
        "number": "6",
        "name": "1Q",
        "type": "output",
        "description": "Flip-flop 1 complement output (1Q-bar). Inverse of 1Q except when both 1SD and 1RD are asserted LOW (both outputs go HIGH per function table)."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "8",
        "name": "2Q",
        "type": "output",
        "description": "Flip-flop 2 complement output (2Q-bar). Inverse of 2Q except when both 2SD and 2RD are LOW."
      },
      {
        "number": "9",
        "name": "2Q",
        "type": "output",
        "description": "Flip-flop 2 true output. Reflects the state stored on the previous LOW-to-HIGH transition of 2CP, or is forced by 2SD/2RD."
      },
      {
        "number": "10",
        "name": "2SD",
        "type": "input",
        "description": "Flip-flop 2 asynchronous set-direct input (active LOW). Drives 2Q HIGH / 2Q-bar LOW independent of clock when asserted."
      },
      {
        "number": "11",
        "name": "2CP",
        "type": "input",
        "description": "Flip-flop 2 clock input, positive edge-triggered (LOW-to-HIGH). Schmitt-trigger action tolerates slow edges."
      },
      {
        "number": "12",
        "name": "2D",
        "type": "input",
        "description": "Flip-flop 2 data input. Value latched into flip-flop 2 on the LOW-to-HIGH edge of 2CP and presented at 2Q."
      },
      {
        "number": "13",
        "name": "2RD",
        "type": "input",
        "description": "Flip-flop 2 asynchronous reset-direct input (active LOW). Drives 2Q LOW / 2Q-bar HIGH independent of clock when asserted."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage. Operating range 2.0 V to 6.0 V for 74HC74 (4.5 V to 5.5 V for 74HCT74). Absolute maximum 7 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74HC74D.pdf",
        "pages": 19,
        "sha256": "1e4ab9833ba6e6a3",
        "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -3.81
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-14_3.9x8.7mm_P1.27mm@sha256:a885b619b22880c9",
      "mark": "drawn"
    },
    "logic": {
      "family_id": "74HC74",
      "logic_family": "74HC",
      "function_code": "74",
      "function_class": "Flip-Flop",
      "function_name": "Dual D Flip-Flop with Set/Reset",
      "manufacturer": null,
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "74hc74d.step",
        "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": "74hc74d-etched.step",
        "role": "eda",
        "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": "12af64b861bce289343f1ef6e92fecb4725d4cc18301d8c9f331665ca988aa7b",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "SOIC-14",
      "Category": "Logic",
      "Pins": "14"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "74hc74d"
  ],
  "discovery_pitch": "74HC74D (Nexperia) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74hc74d.kicad_sym",
    "74hc74d.kicad_mod",
    "74hc74d.glb",
    "74hc74d.step",
    "74hc74d-etched.step",
    "74hc74d.lbr",
    "docs/hero.png",
    "docs/74hc74d-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T15:03:22.170Z"
}