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Ray Set visibility: public a5b1009 3d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "cmfx-104f3950",
  "title": "CMFX 104F3950",
  "brief": "Nanjing Shiheng Elec NTC Thermistors, 0402. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "package": "0402",
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    "category": "Sensors",
    "subcategory": "NTC Thermistors",
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      "lbr": "cmfx-104f3950.lbr"
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    "distributor_links": {
      "lcsc": "C2889043"
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    "distributor_check": {
      "checked_at": "2026-10-17T23:59:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
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        "status": "quota"
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      "mouser": {
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    },
    "pins": [
      {
        "number": "1",
        "name": "1",
        "type": "passive",
        "description": "Terminal electrode of the 100 kΩ ±1% (25 °C) B3950 chip NTC thermistor; non-polarized, interchangeable with the other terminal, operating range -40 to +125 °C."
      },
      {
        "number": "2",
        "name": "2",
        "type": "passive",
        "description": "Terminal electrode of the 100 kΩ ±1% (25 °C) B3950 chip NTC thermistor; non-polarized, interchangeable with the other terminal, rated 100 mW at 25 °C."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "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: The datasheet shows a two-terminal chip NTC thermistor (0402, L1.0×W0.5×T0.5 mm) with external elect; The MPN is given as 'CMFX 104F3950', but the datasheet cover (page 1) prints 'CMFX 1034F3950', which",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
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        "cost_usd": 0.2077,
        "at": "2026-10-17T23:57:49"
      },
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        "pages": 13,
        "sha256": "46ef8fb281e20992",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "91507e5af4251cb4ef38e04889c9b98da29904432bd83786bba13ae9b605eacb",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cmfx-104f3950-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "footprint_binding": "identity",
        "sha256": "fd691f745422458d5c5b3d16304d54b5f8fe65242703ec87538e2a99d27172f0",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nanjing Shiheng Elec",
      "Package": "0402",
      "Category": "Sensors",
      "Pins": "2"
    },
    "appearance": {
      "housing": {
        "quote": "The current that keep body temperature of chip NTC on the PC board in still air",
        "page": 4,
        "doc": "ds.pdf",
        "material": "PC"
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      "version": 1,
      "datasheet_sha256": "46ef8fb281e209926fb1827f5e50643ed72442db12f38b97da615c191f51abca"
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          "name": "Resistance at 0 ℃ (R-T table, R_Min/R_Cent/R_Max)",
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          "name": "Resistance at 125 ℃ (R-T table, R_Min/R_Cent/R_Max)",
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          "name": "Operating ambient temperature",
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          "symbol": "",
          "kind": "thermal",
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        {
          "name": "Reflow peak temperature",
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          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Iron soldering tip temperature",
          "symbol": "",
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          "unit": "℃",
          "min": null,
          "typ": null,
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          "conditions": "Soldering iron tip 280 ℃ max, 3 sec max; max 1 time",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Nominal zero-power resistance",
          "symbol": "R25",
          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "25 ℃",
          "source_page": 2,
          "source": "datasheet"
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        {
          "name": "B constant (25/50)",
          "symbol": "B(25/50)",
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          "unit": "K",
          "min": null,
          "typ": 3950,
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          "source": "datasheet"
        },
        {
          "name": "B constant (25/85)",
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          "typ": 4010,
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        {
          "name": "Permissible operating current",
          "symbol": "",
          "kind": "electrical",
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          "typ": 0.1,
          "max": null,
          "conditions": "25 ℃",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Dissipation factor",
          "symbol": "",
          "kind": "thermal",
          "unit": "mW/℃",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Rated electric power",
          "symbol": "",
          "kind": "electrical",
          "unit": "mW",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "25 ℃",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
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  ],
  "discovery_pitch": "CMFX 104F3950 (Nanjing Shiheng Elec) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}