FM4057E42

{
  "schema_version": 1,
  "type": "component",
  "slug": "fm4057e42",
  "title": "FM4057E42",
  "brief": "Shenzhen Fuman Battery Management, ESOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "fm4057e42"
  ],
  "component": {
    "mpn": "FM4057E42",
    "manufacturer": "Shenzhen Fuman",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/04a05299c1f84746150fc6c519232486.pdf",
    "parts": {
      "symbol": "fm4057e42.kicad_sym",
      "footprint": "fm4057e42.kicad_mod",
      "model_3d": "fm4057e42-etched.glb",
      "model_3d_plain": "fm4057e42.glb",
      "model_3d_step": "fm4057e42-etched.step",
      "model_3d_step_plain": "fm4057e42.step",
      "lbr": "fm4057e42.lbr"
    },
    "distributor_links": {
      "lcsc": "C841236"
    },
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. Leave floating or tie to GND."
      },
      {
        "number": "2",
        "name": "ISET",
        "type": "input",
        "description": "Charge-current programming input. An external resistor from ISET to GND sets the constant-current charge level (typ. 1.0A at 3kΩ, 0.6A at 5kΩ, 0.5A at 6kΩ). Also sets precharge (~60mA at 5kΩ) and termination (~60mA at 5kΩ) thresholds."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground / analog reference for VIN, BAT, ISET, and the LED status outputs."
      },
      {
        "number": "4",
        "name": "VIN",
        "type": "power_in",
        "description": "Charger input supply. Recommended operating range 4.2V-6.5V (typ. 5V); withstands up to 32V. Internal VIN OVP trips at 6.5V (0.5V hysteresis) and UVLO at 4.6V rising / 4.2V falling. Bypass with ≥4.7µF (a 1µF may be used per app circuit)."
      },
      {
        "number": "5",
        "name": "BAT",
        "type": "power_out",
        "description": "Battery connection to the single-cell Li-ion pack. E42 regulates to 4.2V (V_BAT_FULL = 4.158/4.2/4.242V). Recharge threshold ~4.05V, battery OVP at 104%·V_BAT. Requires ~10µF bypass capacitor to GND."
      },
      {
        "number": "6",
        "name": "DONE",
        "type": "output",
        "description": "Open-drain charge-complete status indicator. Sinks current through an external LED (to VIN via limit resistor): LED is off during charging and turns on solid when charging is complete."
      },
      {
        "number": "7",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain charging status indicator. Sinks current through an external LED (to VIN via limit resistor): LED is on while charging and turns off when charging completes."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. Leave floating or tie to GND."
      },
      {
        "number": "9",
        "name": "EPAD",
        "type": "power_in",
        "description": "Exposed thermal pad on package underside. Must be soldered to the PCB ground plane for the specified thermal performance; electrically connected to GND (散热地)."
      }
    ],
    "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": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm@sha256:5848244c5e72002e",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "fm4057e42.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "fm4057e42-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.9,
          4.9,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "5981a88e981e3043cd22ca2b8f549340e2dd83e48b8e0ecf85e1ef9880e671f8",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Shenzhen Fuman",
      "Package": "ESOP-8",
      "Category": "PMIC",
      "Pins": "9"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "fm4057e42"
  ],
  "discovery_pitch": "FM4057E42 (Shenzhen Fuman) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "fm4057e42.kicad_sym",
    "fm4057e42.kicad_mod",
    "fm4057e42.glb",
    "fm4057e42.step",
    "fm4057e42-etched.step",
    "fm4057e42.lbr",
    "docs/hero.png",
    "docs/fm4057e42-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "FM4057E42",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42E43",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42E44",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42BE42",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42S42",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42S43",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42S44",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42S52",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42BS52",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42S53",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42S54",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42D42",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42D43",
      "kind": "packaging"
    },
    {
      "mpn": "FM4057E42D44",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T20:42:01.372Z"
}