CM1821B50

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  "slug": "cm1821b50",
  "title": "CM1821B50",
  "brief": "iCM(创芯微) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "CM1821B50",
    "manufacturer": "iCM(创芯微)",
    "package": "SOT-23-3",
    "pin_count": 3,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
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      "lcsc": "C22446622"
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      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
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      "mouser": {
        "pn": null,
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    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin for the regulator (datasheet lists it only as 地, ground); the absolute-maximum VIN-to-ground rating is -0.3 to 30 V."
      },
      {
        "number": "2",
        "name": "VOUT",
        "type": "power_out",
        "description": "Regulated output, rated 2.5 V to 5.0 V fixed (this variant is the 5.0 V CM1821X50) with up to 150 mA output current and VOUT-to-ground limit of -0.3 to 6 V."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply pin, rated up to 30 V (VIN-to-ground limit -0.3 to 30 V), with 600 mV typical dropout at 100 mA."
      }
    ],
    "provenance": {
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      "factory_chain": {
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        "primary_model": "claude-haiku-5-5",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet's pin tables are garbled in the extracted text: three pin tables (GND/VIN/VOUT, GND/VO; MPN CM1821B50 decodes as CM1821 + B (SOT23-3, per the type-selection table) + 50 (5.0 V output, per "
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        "sha256": "19594f69e73ad482",
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
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        "refuses_to_fabricate": true
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      "footprint": "viewers/footprint.html"
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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",
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        "checked": "2026-11-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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    ]
  },
  "metadata": {
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "rows": [
        {
          "name": "Output current",
          "symbol": "IOUT",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 0.3,
          "conditions": "datasheet prints several: 30 V (VIN到地耐压 (VIN to GND voltage)), 0.3 V (VOUT到VIN耐压 (VOUT to VIN voltage)); the most conservative is kept",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
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  "discovery_pitch": "CM1821B50 (iCM(创芯微)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "visibility": "public",
  "description": "iCM(创芯微) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "org": "adom"
}