74HC123M

{
  "slug": "74hc123m",
  "version": "0.1.0",
  "type": "component",
  "description": "HGSEMI Flip Flops, SOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "74hc123m",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74hc123m.kicad_sym",
    "74hc123m.kicad_mod",
    "74hc123m.glb",
    "74hc123m.step",
    "74hc123m.lbr",
    "docs/hero.png",
    "docs/74hc123m-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "74hc123m-hero.glb",
    "74hc123m-hero.overlay.json",
    "74hc123m-etched.glb"
  ],
  "component": {
    "mpn": "74HC123M",
    "manufacturer": "HGSEMI",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Flip Flops",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602994650534342656",
    "parts": {
      "symbol": "74hc123m.kicad_sym",
      "footprint": "74hc123m.kicad_mod",
      "model_3d": "74hc123m-hero.glb",
      "model_3d_plain": "74hc123m-etched.glb",
      "model_3d_step": "74hc123m-etched.step",
      "model_3d_step_plain": "74hc123m.step",
      "lbr": "74hc123m.lbr"
    },
    "distributor_links": {
      "lcsc": "C7432108"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T18:13:10Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "1A",
        "type": "input",
        "description": "Negative-edge triggered input 1; a LOW-going edge on this gated input triggers or retriggers monostable 1."
      },
      {
        "number": "2",
        "name": "1B",
        "type": "input",
        "description": "Positive-edge triggered input 1; a LOW-to-HIGH transition on this input triggers or retriggers monostable 1."
      },
      {
        "number": "3",
        "name": "1R̅D̅",
        "type": "input",
        "description": "Direct reset input 1, active LOW and also positive-edge triggered; a LOW level terminates the output pulse and inhibits triggering."
      },
      {
        "number": "4",
        "name": "1Q̅",
        "type": "output",
        "description": "Active LOW output 1 of monostable 1 (LOW during the output pulse)."
      },
      {
        "number": "5",
        "name": "2Q",
        "type": "output",
        "description": "Active HIGH output 2 of monostable 2 (HIGH during the output pulse)."
      },
      {
        "number": "6",
        "name": "2CEXT",
        "type": "passive",
        "description": "External capacitor connection 2; the datasheet recommends grounding this pin externally to pin 8 (GND) for minimum noise generation."
      },
      {
        "number": "7",
        "name": "2REXT/CEXT",
        "type": "passive",
        "description": "External resistor and capacitor connection 2, which together with the capacitor on 2CEXT sets the basic output pulse width."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (0V) reference for all voltages."
      },
      {
        "number": "9",
        "name": "2A",
        "type": "input",
        "description": "Negative-edge triggered input 2; a LOW-going edge on this gated input triggers or retriggers monostable 2."
      },
      {
        "number": "10",
        "name": "2B",
        "type": "input",
        "description": "Positive-edge triggered input 2; a LOW-to-HIGH transition on this input triggers or retriggers monostable 2."
      },
      {
        "number": "11",
        "name": "2RD",
        "type": "input",
        "description": "Direct reset input 2, active LOW and also positive-edge triggered; a LOW level terminates the output pulse and inhibits triggering."
      },
      {
        "number": "12",
        "name": "2Q̅",
        "type": "output",
        "description": "Active LOW output 2 of monostable 2 (LOW during the output pulse)."
      },
      {
        "number": "13",
        "name": "1Q",
        "type": "output",
        "description": "Active HIGH output 1 of monostable 1 (HIGH during the output pulse)."
      },
      {
        "number": "14",
        "name": "1CEXT",
        "type": "passive",
        "description": "External capacitor connection 1; the datasheet recommends grounding this pin externally to pin 8 (GND) for minimum noise generation."
      },
      {
        "number": "15",
        "name": "1REXT/CEXT",
        "type": "passive",
        "description": "External resistor and capacitor connection 1, which together with the capacitor on 1CEXT sets the basic output pulse width."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; the recommended operating range is 2.0 V to 6.0 V and the absolute maximum rating is +7.0 V."
      }
    ],
    "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 MPN 74HC123M is listed as SOP-16 in the ordering table (page 1), and the pin table on page 4 is ; Overbars (active-LOW markers) were lost in text extraction, so pin names such as 1A̅, 1R̅D̅, 2Q̅ are; The pin 16 VCC description combines the pin table (page 4) with the recommended operating range and ",
          "1/16 pin names appear NOWHERE in the datasheet text: ['3:1R̅D̅@p4']"
        ],
        "pages_sent": 20,
        "cost_usd": 0.057,
        "at": "2026-10-18T18:12:54"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602994650534342656",
        "pages": 20,
        "sha256": "d6c2222dfb62a583",
        "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": [
      {
        "file": "74hc123m.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": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74hc123m-etched.step",
        "role": "eda",
        "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": "3840010159b4384711e34aaa35ce66692e49e4b896ae309a37f294fc515ca781",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}