M41ST85WMX6TR

{
  "slug": "m41st85wmx6tr",
  "version": "0.1.0",
  "type": "component",
  "description": "STMicroelectronics Real Time Clocks, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "clock-timing",
    "m41st85wmx6tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "m41st85wmx6tr.kicad_sym",
    "m41st85wmx6tr.kicad_mod",
    "m41st85wmx6tr.glb",
    "m41st85wmx6tr.step",
    "m41st85wmx6tr.lbr",
    "docs/hero.png",
    "docs/m41st85wmx6tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "m41st85wmx6tr-hero.glb",
    "m41st85wmx6tr-hero.overlay.json"
  ],
  "component": {
    "mpn": "M41ST85WMX6TR",
    "manufacturer": "STMicroelectronics",
    "package": "SOIC-28-300mil",
    "pin_count": 28,
    "category": "Clock/Timing",
    "subcategory": "Real Time Clocks",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040739070185472",
    "parts": {
      "symbol": "m41st85wmx6tr.kicad_sym",
      "footprint": "m41st85wmx6tr.kicad_mod",
      "model_3d": "m41st85wmx6tr-hero.glb",
      "model_3d_plain": "m41st85wmx6tr.glb",
      "model_3d_step": "m41st85wmx6tr-etched.step",
      "model_3d_step_plain": "m41st85wmx6tr.step",
      "lbr": "m41st85wmx6tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2651507",
      "digikey": "497-13794-2-ND",
      "mouser": "511-M41ST85WMX6TR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T03:06:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-13794-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "511-M41ST85WMX6TR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "NF",
        "type": "passive",
        "description": "No function pin that should be tied to VSS and is internally shorted to pins 2, 3 and 4."
      },
      {
        "number": "2",
        "name": "NF",
        "type": "passive",
        "description": "No function pin that should be tied to VSS and is internally shorted to pins 1, 3 and 4."
      },
      {
        "number": "3",
        "name": "NF",
        "type": "passive",
        "description": "No function pin that should be tied to VSS and is internally shorted to pins 1, 2 and 4."
      },
      {
        "number": "4",
        "name": "NF",
        "type": "passive",
        "description": "No function pin that should be tied to VSS and is internally shorted to pins 1, 2 and 3."
      },
      {
        "number": "5",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "7",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "8",
        "name": "SQW",
        "type": "output",
        "description": "Programmable square wave output from 1 Hz to 32.768 kHz, enabled by the SQWE bit; CMOS output with VOH 2.4 V min at IOH = -1.0 mA."
      },
      {
        "number": "9",
        "name": "WDI",
        "type": "input",
        "description": "Watchdog input that resets the watchdog timer on a high-to-low or low-to-high transition; internally pulled down to VSS through 100 kΩ and tied to VSS if unused."
      },
      {
        "number": "10",
        "name": "RSTIN1",
        "type": "input",
        "description": "Active-low reset input 1 that generates an output reset on RST; internally pulled up to VCC through 100 kΩ, pulses shorter than 50 ns are ignored."
      },
      {
        "number": "11",
        "name": "RSTIN2",
        "type": "input",
        "description": "Active-low reset input 2 that generates an output reset on RST; internally pulled up to VCC through 100 kΩ, pulses shorter than 20 ms are ignored."
      },
      {
        "number": "12",
        "name": "PFO",
        "type": "output",
        "description": "Power-fail output that goes low when PFI is below the 1.25 V threshold and during battery backup; left unconnected if unused."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "14",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "15",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup battery supply input, 2.5 to 3.5 V (3.0 V typ), for the embedded-crystal SOIC only."
      },
      {
        "number": "16",
        "name": "ECON",
        "type": "output",
        "description": "Conditioned chip enable output that write-protects external LPSRAM by going high (within 0.2 V of VBAT) when VCC is out of tolerance."
      },
      {
        "number": "17",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data input/output, requiring a pull-up resistor to a positive supply."
      },
      {
        "number": "18",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "19",
        "name": "RST",
        "type": "output",
        "description": "Active-low open-drain reset output driven by power-fail detect, RSTIN1/RSTIN2 and watchdog; needs a pull-up resistor, up to 3.6 V."
      },
      {
        "number": "20",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "21",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "22",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input, up to 400 kHz, requiring a pull-up resistor to a positive supply."
      },
      {
        "number": "23",
        "name": "PFI",
        "type": "input",
        "description": "Power-fail input compared to the 1.25 V internal reference (threshold 1.225 to 1.275 V); connected to VSS if unused."
      },
      {
        "number": "24",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "25",
        "name": "VOUT",
        "type": "power_out",
        "description": "Supply output to external SRAM, supplying up to 100 mA from VCC or 100 µA in battery backup."
      },
      {
        "number": "26",
        "name": "IRQ/FT/OUT",
        "type": "output",
        "description": "Open-drain interrupt, frequency test (512 Hz) and output-driver pin for alarm and watchdog; needs a pull-up resistor (500 Ω to 10 kΩ recommended), VOL 0.4 V at 10 mA."
      },
      {
        "number": "27",
        "name": "EX",
        "type": "input",
        "description": "External chip enable input, propagated to ECON with a 15 ns max delay."
      },
      {
        "number": "28",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 2.7 to 3.6 V (absolute maximum 4.6 V)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin types for NF (tied to VSS per note) and NC pins chosen by judgment; datasheet gives no electrica; The datasheet's Figure 3 (28-pin 300 mil SOIC) is used for SOX28 since it is the only variant with V",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 43,
        "cost_usd": 0.9913,
        "at": "2026-10-08T03:05:54"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040739070185472",
        "pages": 43,
        "sha256": "3cc1487654fb8698",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "m41st85wmx6tr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          17.9,
          2.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "b889a13dbe9ec59e79fa9f1b5118b00bfa54f9582392335ff3365b64afc264b1",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "m41st85wmx6tr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          17.9,
          2.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "64e3e45eaebc809391b82137f5dc249632de6c9c8f6cfc4b810280b25ba91490",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}