HT1381M

{
  "slug": "ht1381m",
  "version": "0.1.0",
  "type": "component",
  "description": "HGSEMI Real Time Clocks, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "clock-timing",
    "ht1381m",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ht1381m.kicad_sym",
    "ht1381m.kicad_mod",
    "ht1381m.glb",
    "ht1381m.step",
    "ht1381m.lbr",
    "docs/hero.png",
    "docs/ht1381m-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ht1381m-hero.glb",
    "ht1381m-hero.overlay.json",
    "ht1381m-etched.glb"
  ],
  "component": {
    "mpn": "HT1381M",
    "manufacturer": "HGSEMI",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Clock/Timing",
    "subcategory": "Real Time Clocks",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602994642456113152",
    "parts": {
      "symbol": "ht1381m.kicad_sym",
      "footprint": "ht1381m.kicad_mod",
      "model_3d": "ht1381m-hero.glb",
      "model_3d_plain": "ht1381m-etched.glb",
      "model_3d_step": "ht1381m-etched.step",
      "model_3d_step_plain": "ht1381m.step",
      "lbr": "ht1381m.lbr"
    },
    "distributor_links": {
      "lcsc": "C7432080"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T05:05:58Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "2",
        "name": "X1",
        "type": "input",
        "description": "32768Hz crystal input pad; a 9.0pF load-capacitance crystal is recommended and no additional load capacitors should be connected to X1 or X2."
      },
      {
        "number": "3",
        "name": "X2",
        "type": "output",
        "description": "Oscillator output pad for the 32768Hz crystal; no additional load capacitors should be connected to this pin."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "Negative power supply and ground reference."
      },
      {
        "number": "5",
        "name": "REST",
        "type": "input",
        "description": "Reset pin for serial transmission: taken high to enable access to the shift register, and taken low to terminate the transfer and place I/O in high impedance."
      },
      {
        "number": "6",
        "name": "I/O",
        "type": "bidirectional",
        "description": "Serial data input/output; data is read after the SCLK rising edge and becomes output after the SCLK falling edge, going high impedance when REST is low."
      },
      {
        "number": "7",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input used to synchronize register reads and writes, with data entered on the rising edge and output on the falling edge."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive power supply, operating range 2.0V to 5.5V."
      }
    ],
    "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 REST pin name is printed with an overline (active-low style bar) that does not survive text extr; Pin 1 is labeled NC in the SOP-8 pin table; it is listed as unconnected rather than a functional pin"
        ],
        "pages_sent": 16,
        "cost_usd": 0.05,
        "at": "2026-10-18T05:00:59"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602994642456113152",
        "pages": 16,
        "sha256": "45d4dc6ac537feab",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ht1381m.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ht1381m-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "e57a42b8ab5a39d9280cad94a7016c6265a0336b7c95d2d5a9b69b9323d76ba6",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}