BL4056C-42ES

{
  "slug": "bl4056c-42es",
  "version": "0.1.0",
  "type": "component",
  "description": "BL(Shanghai Belling) Battery Management ICs, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "bl4056c-42es",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bl4056c-42es.kicad_sym",
    "bl4056c-42es.kicad_mod",
    "bl4056c-42es.glb",
    "bl4056c-42es.step",
    "bl4056c-42es.lbr",
    "docs/hero.png",
    "docs/bl4056c-42es-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bl4056c-42es-hero.glb",
    "bl4056c-42es-hero.overlay.json",
    "bl4056c-42es-etched.glb"
  ],
  "component": {
    "mpn": "BL4056C-42ES",
    "manufacturer": "BL(Shanghai Belling)",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "Power Management ICs",
    "subcategory": "Battery Management ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/aaf3e6019fe8bcac5e4086a773cce8d2.pdf",
    "parts": {
      "symbol": "bl4056c-42es.kicad_sym",
      "footprint": "bl4056c-42es.kicad_mod",
      "model_3d": "bl4056c-42es-hero.glb",
      "model_3d_plain": "bl4056c-42es-etched.glb",
      "model_3d_step": "bl4056c-42es-etched.step",
      "model_3d_step_plain": "bl4056c-42es.step",
      "lbr": "bl4056c-42es.lbr"
    },
    "distributor_links": {
      "lcsc": "C918909"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T15:08:49Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "TEMP",
        "type": "input",
        "description": "Battery temperature sense input: the NTC divider voltage is compared with internal thresholds VLOW = 45%×VCC and VHIGH = 80%×VCC, charging pauses when VTEMP is outside that window, and tying TEMP to GND disables temperature monitoring; absolute maximum is -0.3 V to 10 V."
      },
      {
        "number": "2",
        "name": "PROG",
        "type": "bidirectional",
        "description": "Sets the constant-charge current through a resistor to GND (IBAT = 1100 / RPROG, for example 1.1 kΩ gives 1000 mA, ±10%) and monitors the charge current with about 1.0 V on the pin in current mode; absolute limits are -0.3 V to VCC+0.3 V and 1200 µA pin current."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; the PROG current-set resistor and the TEMP divider network return to this pin."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Input supply pin with a specified operating range of 4.2 V to 9.0 V (5 V typical) and absolute range of -6.5 V to 9 V; undervoltage lockout threshold is 3.6 V and adaptive current reduction starts at 4.3 V."
      },
      {
        "number": "5",
        "name": "BAT",
        "type": "power_out",
        "description": "Charger output to the single Li-ion cell, with a float voltage of 4.2 V for the BL4056C-42ES variant, absolute limits of -4.35 V to 7 V, and a pin current rating of 1200 mA."
      },
      {
        "number": "6",
        "name": "STDBY",
        "type": "output",
        "description": "Open-drain charge-complete status output that is pulled low when charging is finished, with output low of 0.3 V to 0.6 V at 5 mA and absolute maximum of -0.3 V to 10 V."
      },
      {
        "number": "7",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain charging status output that is pulled low while the battery is charging and is high-impedance otherwise, with output low of 0.3 V to 0.6 V at 5 mA and absolute maximum of -0.3 V to 10 V."
      },
      {
        "number": "8",
        "name": "CE",
        "type": "input",
        "description": "Chip-enable input: driving it low stops charging and places the device in shutdown, with an absolute range of -6.5 V to 10 V."
      },
      {
        "number": "9",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin numbers, names and functions come from the ESOP8 pin table on page 2. The ordering table on ; The KiCad ERC types are my classification, not datasheet statements. PROG is set to bidirectional be; The datasheet gives two TEMP threshold sets: page 3 lists 43–45% and 80–82% of VCC, and page 6 state",
          "exposed pad 9 added from the footprint"
        ],
        "pages_sent": 12,
        "cost_usd": 0.0474,
        "at": "2026-11-05T15:08:36"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/aaf3e6019fe8bcac5e4086a773cce8d2.pdf",
        "pages": 12,
        "sha256": "a6c827c4c83b84ee",
        "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"
    },
    "models_3d": [
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        "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": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bl4056c-42es-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "zmin_mm": 0.0,
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        "footprint_binding": "identity",
        "sha256": "0c4f09c4b8120a121918a3507c709f2fde9259fc2d34e7866e7245ffdde0d585",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  }
}