HT1381M

{
  "schema_version": 1,
  "type": "component",
  "slug": "ht1381m",
  "title": "HT1381M",
  "brief": "HGSEMI Real Time Clocks, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "clock-timing",
    "ht1381m",
    "factory-2.0.0",
    "extractor-text"
  ],
  "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"
    },
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        "seat": "z = 0",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "SOP-8",
      "Category": "Clock/Timing",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "45d4dc6ac537feabd82ce6282082e1e7fb33b40a28477befb2f056780495641e",
      "rows": [
        {
          "name": "Supply Voltage (absolute maximum)",
          "symbol": "VDD",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": 0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature (absolute maximum)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": 0,
          "typ": null,
          "max": 70,
          "conditions": "",
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        },
        {
          "name": "VDD Operating Voltage",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": 5.5,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Standby Current",
          "symbol": "ISTB",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VDD=2V; SCLK, I/O, RST open; clock halt bit CH=1",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Operating Current",
          "symbol": "IDD",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.7,
          "max": 1,
          "conditions": "VDD=2V, no load",
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        },
        {
          "name": "Operating Current",
          "symbol": "IDD",
          "kind": "electrical",
          "unit": "μA",
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          "max": 1.2,
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        },
        {
          "name": "Source Current",
          "symbol": "IOH",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.2,
          "max": 0.4,
          "conditions": "VDD=2V, VOH=1.8V",
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        },
        {
          "name": "Source Current",
          "symbol": "IOH",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.5,
          "max": 1,
          "conditions": "VDD=5V, VOH=4.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Sink Current",
          "symbol": "IOL",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.7,
          "max": 1.5,
          "conditions": "VDD=2V, VOL=0.2V",
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        },
        {
          "name": "Sink Current",
          "symbol": "IOL",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 2,
          "max": 4,
          "conditions": "VDD=5V, VOL=0.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "\"H\" Input Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "\"L\" Input Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "VDD=5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Data to Clock Setup",
          "symbol": "tDC",
          "kind": "timing",
          "unit": "ns",
          "min": 200,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Data to Clock Setup",
          "symbol": "tDC",
          "kind": "timing",
          "unit": "ns",
          "min": 50,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock to Data Hold",
          "symbol": "tCDH",
          "kind": "timing",
          "unit": "ns",
          "min": 280,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock to Data Hold",
          "symbol": "tCDH",
          "kind": "timing",
          "unit": "ns",
          "min": 70,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock to Data Delay",
          "symbol": "tCDD",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 800,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock to Data Delay",
          "symbol": "tCDD",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock Low Time",
          "symbol": "tCL",
          "kind": "timing",
          "unit": "ns",
          "min": 1000,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock Low Time",
          "symbol": "tCL",
          "kind": "timing",
          "unit": "ns",
          "min": 250,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock High Time",
          "symbol": "tCH",
          "kind": "timing",
          "unit": "ns",
          "min": 1000,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
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        },
        {
          "name": "Clock High Time",
          "symbol": "tCH",
          "kind": "timing",
          "unit": "ns",
          "min": 250,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock Frequency",
          "symbol": "fSCLK",
          "kind": "timing",
          "unit": "MHz",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock Frequency",
          "symbol": "fSCLK",
          "kind": "timing",
          "unit": "MHz",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock Rise and Fall Time",
          "symbol": "tr, tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 2000,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock Rise and Fall Time",
          "symbol": "tr, tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Reset to Clock Setup",
          "symbol": "tCC",
          "kind": "timing",
          "unit": "us",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Reset to Clock Setup",
          "symbol": "tCC",
          "kind": "timing",
          "unit": "us",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock to Reset Hold",
          "symbol": "tCCH",
          "kind": "timing",
          "unit": "ns",
          "min": 240,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Clock to Reset Hold",
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          "kind": "timing",
          "unit": "ns",
          "min": 60,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Reset Inactive Time",
          "symbol": "tCWH",
          "kind": "timing",
          "unit": "us",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD=2V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Reset Inactive Time",
          "symbol": "tCWH",
          "kind": "timing",
          "unit": "us",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "VDD=5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Reset to I/O High Impedance",
          "symbol": "tCDZ",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 280,
          "conditions": "VDD=2V",
          "source_page": 5,
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        {
          "name": "Reset to I/O High Impedance",
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          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 70,
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      ]
    }
  },
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  "discovery_pitch": "HT1381M (HGSEMI) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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