CMFB 503F3950

{
  "schema_version": 1,
  "type": "component",
  "slug": "cmfb-503f3950",
  "title": "CMFB 503F3950",
  "brief": "Nanjing Shiheng Elec NTC Thermistors, 0805. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "sensor",
    "cmfb 503f3950"
  ],
  "component": {
    "mpn": "CMFB 503F3950",
    "manufacturer": "Nanjing Shiheng Elec",
    "package": "0805",
    "pin_count": 2,
    "category": "Sensor",
    "subcategory": "NTC Thermistors",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2109290430_Nanjing-Shiheng-Elec-CMFB-503F3950_C2889058.pdf",
    "parts": {
      "symbol": "cmfb-503f3950.kicad_sym",
      "footprint": "cmfb-503f3950.kicad_mod",
      "model_3d": "cmfb-503f3950-etched.glb",
      "model_3d_plain": "cmfb-503f3950.glb",
      "model_3d_step": "cmfb-503f3950-etched.step",
      "model_3d_step_plain": "cmfb-503f3950.step",
      "lbr": "cmfb-503f3950.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "1",
        "type": "passive",
        "description": "External electrode terminal 1 of the two-terminal NTC thermistor. Non-polarized; either terminal may be used as input or output. Resistance between terminals is ~50 kΩ at 25 °C, decreasing with temperature per the R-T table."
      },
      {
        "number": "2",
        "name": "2",
        "type": "passive",
        "description": "External electrode terminal 2 of the two-terminal NTC thermistor. Non-polarized; interchangeable with terminal 1. Combined with terminal 1 forms the NTC resistance element (50 kΩ ±1% @ 25 °C, B = 3950 K)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2109290430_Nanjing-Shiheng-Elec-CMFB-503F3950_C2889058.pdf",
        "pages": 13,
        "sha256": "b97d3c412e07c2b3",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 2,
        "described": 2,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cmfb-503f3950.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.0,
          1.2,
          0.45
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ded342cdb394fb45395227beaaa75cc390613cf2581b29cd6d22c12abd6103b2",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cmfb-503f3950-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.0,
          1.2,
          0.45
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "793cbd29b6a5d889ede13adc96676655e3a51f8ee33887e4711d8f7dc9d7d94a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nanjing Shiheng Elec",
      "Package": "0805",
      "Category": "Sensor",
      "Pins": "2"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "cmfb 503f3950"
  ],
  "discovery_pitch": "CMFB 503F3950 (Nanjing Shiheng Elec) 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",
    "cmfb-503f3950.kicad_sym",
    "cmfb-503f3950.kicad_mod",
    "cmfb-503f3950.glb",
    "cmfb-503f3950.step",
    "cmfb-503f3950.lbr",
    "docs/hero.png",
    "docs/cmfb-503f3950-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cmfb-503f3950-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "CMFB 503F3950B",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T19:16:36.528Z"
}