FM4057S42

{
  "schema_version": 1,
  "type": "component",
  "slug": "fm4057s42",
  "title": "FM4057S42",
  "brief": "Shenzhen Fuman Battery Management, SOT-23-6. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "fm4057s42"
  ],
  "component": {
    "mpn": "FM4057S42",
    "manufacturer": "Shenzhen Fuman",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/04a05299c1f84746150fc6c519232486.pdf",
    "parts": {
      "symbol": "fm4057s42.kicad_sym",
      "footprint": "fm4057s42.kicad_mod",
      "model_3d": "fm4057s42-etched.glb",
      "model_3d_plain": "fm4057s42.glb",
      "model_3d_step": "fm4057s42-etched.step",
      "model_3d_step_plain": "fm4057s42.step",
      "lbr": "fm4057s42.lbr"
    },
    "distributor_links": {
      "lcsc": "C841287"
    },
    "pins": [
      {
        "number": "1",
        "name": "CHRG",
        "type": "output",
        "description": "Charge-in-progress status output. Open-drain LED driver: sinks current (LED on) while charging is active, high-Z (LED off) when charging completes. Connect an external LED with series resistor to VIN."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference."
      },
      {
        "number": "3",
        "name": "BAT",
        "type": "power_out",
        "description": "Battery output terminal. Connects to the positive terminal of the single-cell Li-ion battery. Regulated to 4.2V for the '42' variant. Absolute max 6V; recommended 10 µF bulk cap to GND."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "Charger input supply. Recommended 4.2 V-6.5 V (typ 5V from AC adapter or USB); absolute maximum 32V. Input OVP trips at 6.5V for the standard FM4057; 1 µF decoupling to GND recommended."
      },
      {
        "number": "5",
        "name": "DONE",
        "type": "output",
        "description": "Charge-complete status output. Open-drain LED driver: high-Z (LED off) while charging, sinks current (LED on) once the battery is fully charged. Connect an external LED with series resistor to VIN."
      },
      {
        "number": "6",
        "name": "ISET",
        "type": "input",
        "description": "Charge-current programming pin. Connect a resistor from ISET to GND to set the constant-current charge level (up to 1A). Also participates in thermal regulation feedback."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/04a05299c1f84746150fc6c519232486.pdf",
        "pages": 14,
        "sha256": "bfc23830eabbc3b5",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 6,
        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-6@sha256:f341c73aac9dcb55",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "fm4057s42.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9fe686b4d1b56927a41fa84a9bc1efb61d8a45a123a3db43bcaa05c2891d635",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "fm4057s42-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d9bb7f4a4207120a82c883e38d2522569922f758cc54b7562dca22c5e814f87a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Shenzhen Fuman",
      "Package": "SOT-23-6",
      "Category": "PMIC",
      "Pins": "6"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "fm4057s42"
  ],
  "discovery_pitch": "FM4057S42 (Shenzhen Fuman) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "fm4057s42.kicad_sym",
    "fm4057s42.kicad_mod",
    "fm4057s42.glb",
    "fm4057s42.step",
    "fm4057s42-etched.step",
    "fm4057s42.lbr",
    "docs/hero.png",
    "docs/fm4057s42-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "FM4057S42",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057S43",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057S44",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057S52",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057BS52",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057S53",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057S54",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057E42",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057BE42",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057E43",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057E44",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057D42",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057D43",
      "kind": "unknown"
    },
    {
      "mpn": "FM4057D44",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T20:42:09.502Z"
}