74HC594D

{
  "slug": "74hc594d",
  "version": "0.1.0",
  "type": "component",
  "description": "Nexperia Shift Registers, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "74hc594d",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74hc594d.kicad_sym",
    "74hc594d.kicad_mod",
    "74hc594d.glb",
    "74hc594d.step",
    "74hc594d.lbr",
    "docs/hero.png",
    "docs/74hc594d-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "74hc594d-hero.glb",
    "74hc594d-hero.overlay.json",
    "74hc594d-etched.glb"
  ],
  "component": {
    "mpn": "74HC594D",
    "manufacturer": "Nexperia",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Shift Registers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586194038093721600",
    "parts": {
      "symbol": "74hc594d.kicad_sym",
      "footprint": "74hc594d.kicad_mod",
      "model_3d": "74hc594d-hero.glb",
      "model_3d_plain": "74hc594d-etched.glb",
      "model_3d_step": "74hc594d-etched.step",
      "model_3d_step_plain": "74hc594d.step",
      "lbr": "74hc594d.lbr"
    },
    "distributor_links": {
      "lcsc": "C134302",
      "mouser": "757-74HC594D"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T01:28:09Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "757-74HC594D",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Q1",
        "type": "output",
        "description": "Parallel data output Q1 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "2",
        "name": "Q2",
        "type": "output",
        "description": "Parallel data output Q2 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "3",
        "name": "Q3",
        "type": "output",
        "description": "Parallel data output Q3 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "4",
        "name": "Q4",
        "type": "output",
        "description": "Parallel data output Q4 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "5",
        "name": "Q5",
        "type": "output",
        "description": "Parallel data output Q5 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "6",
        "name": "Q6",
        "type": "output",
        "description": "Parallel data output Q6 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "7",
        "name": "Q7",
        "type": "output",
        "description": "Parallel data output Q7 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (0 V) reference for all voltages on the device."
      },
      {
        "number": "9",
        "name": "Q7S",
        "type": "output",
        "description": "Serial data output that enables cascading of devices; output current is limited to ±25 mA for Q7S (Table 4)."
      },
      {
        "number": "10",
        "name": "SHR",
        "type": "input",
        "description": "Shift register reset, active LOW; a LOW level clears the shift register."
      },
      {
        "number": "11",
        "name": "SHCP",
        "type": "input",
        "description": "Shift register clock input; data is shifted on each LOW-to-HIGH transition."
      },
      {
        "number": "12",
        "name": "STCP",
        "type": "input",
        "description": "Storage register clock input; shift register data is transferred to the storage register and outputs on a LOW-to-HIGH transition."
      },
      {
        "number": "13",
        "name": "STR",
        "type": "input",
        "description": "Storage register reset, active LOW; a LOW level clears the storage register."
      },
      {
        "number": "14",
        "name": "DS",
        "type": "input",
        "description": "Serial data input loaded into shift register stage 0 on a LOW-to-HIGH SHCP transition while SHR is HIGH; inputs include clamp diodes so current-limiting resistors allow voltages above VCC."
      },
      {
        "number": "15",
        "name": "Q0",
        "type": "output",
        "description": "Parallel data output Q0 from the storage register; output current is limited to ±35 mA for parallel outputs Qn (Table 4)."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; 2.0 V to 6.0 V for 74HC594 and 4.5 V to 5.5 V for 74HCT594 (Table 5)."
      }
    ],
    "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 datasheet does not state whether the Q0–Q7 and Q7S outputs are tri-state; they are typed as outp; Output current limits in the descriptions come from the Limiting values table (Table 4, page 6), not; The 74HC594D is listed in Table 1 as the SO16 package (SOT109-1) and the pinning on page 4 confirms "
        ],
        "pages_sent": 9,
        "cost_usd": 0.0587,
        "at": "2026-10-19T01:26:46"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586194038093721600",
        "pages": 23,
        "sha256": "0d94428470ab60d2",
        "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": [
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        "file": "74hc594d.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": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74hc594d-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "6fba3022db7a9e60de55b58d0ad6210f9cece08196db2aceab6c6e4169c1d82b",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}