M41T81M6F

{
  "schema_version": 1,
  "type": "component",
  "slug": "m41t81m6f",
  "title": "M41T81M6F",
  "brief": "STMicroelectronics Real-time Clocks (RTC), SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "m41t81m6f"
  ],
  "component": {
    "mpn": "M41T81M6F",
    "manufacturer": "STMicroelectronics",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Real-time Clocks (RTC)",
    "datasheet": "https://www.st.com/resource/en/datasheet/m41t81m6f.pdf",
    "parts": {
      "symbol": "m41t81m6f.kicad_sym",
      "footprint": "m41t81m6f.kicad_mod",
      "model_3d": "m41t81m6f-etched.glb",
      "model_3d_plain": "m41t81m6f.glb",
      "model_3d_step": "m41t81m6f-etched.step",
      "model_3d_step_plain": "m41t81m6f.step",
      "lbr": "m41t81m6f.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "XI",
        "type": "input",
        "description": "Oscillator input. Connects to one terminal of the external 32.768 kHz crystal. Internal load capacitance (12.5 pF) is integrated on-chip."
      },
      {
        "number": "2",
        "name": "XO",
        "type": "output",
        "description": "Oscillator output. Connects to the other terminal of the external 32.768 kHz crystal."
      },
      {
        "number": "3",
        "name": "VBAT",
        "type": "power_in",
        "description": "Battery supply voltage. Connects to a small lithium button cell to sustain SRAM and clock operation when VCC falls below the switchover trip point."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "5",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data input/output (open-drain). Requires an external pull-up resistor to a positive supply. Supports 400 kHz Fast-mode I2C."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input. Requires an external pull-up resistor to a positive supply. Supports 400 kHz Fast-mode I2C."
      },
      {
        "number": "7",
        "name": "IRQ/FT/OUT/SQW",
        "type": "output",
        "description": "Multi-function open-drain output. Software-selectable between alarm interrupt (IRQ, active low), frequency test (FT), general output driver (OUT), or programmable square-wave (SQW). Square-wave function has the highest priority. Requires external pull-up."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Main supply voltage, 2.0 V to 5.5 V. When VCC falls below the VSO trip point (VBAT - 0.5 V typ), the device automatically switches to VBAT."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/m41t81m6f.pdf",
        "pages": 29,
        "sha256": "cd94dc7a56064d62",
        "source_tier": "mfr"
      },
      "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"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "SOIC-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "m41t81m6f"
  ],
  "discovery_pitch": "M41T81M6F (STMicroelectronics) 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",
    "m41t81m6f.kicad_sym",
    "m41t81m6f.kicad_mod",
    "m41t81m6f.glb",
    "m41t81m6f.step",
    "m41t81m6f.lbr",
    "docs/hero.png",
    "docs/m41t81m6f-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "m41t81m6f-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "M41T81M6F",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-28T18:22:17.704Z"
}