MCP73871-2AAI

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  "type": "component",
  "slug": "mcp73871-2aai",
  "title": "MCP73871-2AAI",
  "brief": "Microchip Tech Battery Management ICs, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management ics",
    "mcp73871-2aai",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "MCP73871-2AAI",
    "manufacturer": "Microchip Tech",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Power Management ICs",
    "subcategory": "Battery Management ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/0ebd35b726854fc8a42844c353ab2232.pdf",
    "parts": {
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      "lbr": "mcp73871-2aai.lbr"
    },
    "distributor_links": {
      "lcsc": "C144351"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T01:21:19Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
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      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "OUT",
        "type": "power_out",
        "description": "System output terminal that powers the system load while the battery charges independently; bypass to VSS with a minimum of 4.7 µF."
      },
      {
        "number": "2",
        "name": "VPCC",
        "type": "input",
        "description": "Voltage proportional charge control input; supply 1.23V or greater to enable, or connect to IN to disable the feature."
      },
      {
        "number": "3",
        "name": "SEL",
        "type": "input",
        "description": "Input type selection: Low for USB port, High for AC-DC adapter."
      },
      {
        "number": "4",
        "name": "PROG2",
        "type": "input",
        "description": "USB port input current limit selection when SEL = Low (Low = 100 mA, High = 500 mA)."
      },
      {
        "number": "5",
        "name": "THERM",
        "type": "bidirectional",
        "description": "Thermistor monitoring input and bias current for battery cell temperature monitoring."
      },
      {
        "number": "6",
        "name": "PG",
        "type": "output",
        "description": "Open-drain Power-Good status output, low when the input is above the UVLO threshold and greater than the battery voltage."
      },
      {
        "number": "7",
        "name": "STAT2",
        "type": "output",
        "description": "Open-drain charge status output 2 for driving an LED or a pull-up to a host microcontroller."
      },
      {
        "number": "8",
        "name": "STAT1/LBO",
        "type": "output",
        "description": "Open-drain charge status output 1, also low battery output indicator when VBAT > VIN."
      },
      {
        "number": "9",
        "name": "TE",
        "type": "input",
        "description": "Timer enable; enables the safety timer when active Low."
      },
      {
        "number": "10",
        "name": "VSS",
        "type": "power_in",
        "description": "Battery management 0V reference; connect to negative terminal of the battery, system load and input supply."
      },
      {
        "number": "11",
        "name": "VSS",
        "type": "power_in",
        "description": "Battery management 0V reference; connect to negative terminal of the battery, system load and input supply."
      },
      {
        "number": "12",
        "name": "PROG3",
        "type": "bidirectional",
        "description": "Termination set point for both AC-DC adapter and USB port."
      },
      {
        "number": "13",
        "name": "PROG1",
        "type": "bidirectional",
        "description": "Fast charge current regulation setting (resistor to VSS) with SEL = High, and preconditioning set point for both USB port and AC-DC adapter."
      },
      {
        "number": "14",
        "name": "VBAT",
        "type": "power_in",
        "description": "Battery positive input and output connection; bypass to VSS with a minimum of 4.7 µF."
      },
      {
        "number": "15",
        "name": "VBAT",
        "type": "power_in",
        "description": "Battery positive input and output connection; bypass to VSS with a minimum of 4.7 µF."
      },
      {
        "number": "16",
        "name": "VBAT_SENSE",
        "type": "bidirectional",
        "description": "Battery voltage sense; connect to battery positive terminal, final voltage regulated to VREG."
      },
      {
        "number": "17",
        "name": "CE",
        "type": "input",
        "description": "Device charge enable; enabled when CE = High."
      },
      {
        "number": "18",
        "name": "IN",
        "type": "power_in",
        "description": "Power supply input; VREG + 0.3V to 6V recommended, bypass to VSS with a minimum of 4.7 µF."
      },
      {
        "number": "19",
        "name": "IN",
        "type": "power_in",
        "description": "Power supply input; VREG + 0.3V to 6V recommended, bypass to VSS with a minimum of 4.7 µF."
      },
      {
        "number": "20",
        "name": "OUT",
        "type": "power_out",
        "description": "System output terminal that powers the system load while the battery charges independently; bypass to VSS with a minimum of 4.7 µF."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The exposed pad is labeled 'EP' in the datasheet with no numeric pin; the package drawing text is ga; The datasheet pin table gives I/O direction only. Types for THERM, PROG1, PROG3, VBAT and VBAT_SENSE"
        ],
        "pages_sent": 8,
        "cost_usd": 0.0896,
        "at": "2026-10-27T01:20:53"
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      "datasheet": {
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        "pages": 40,
        "sha256": "bc4dc7e5bca1f6a2",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
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        "refuses_to_fabricate": true
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    },
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "checked": "2026-10-27",
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  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-20-EP(4x4)",
      "Category": "Power Management ICs",
      "Pins": "21"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "bc4dc7e5bca1f6a27ebca9b25d77fb2caf8184d0df31f62b9094182161b21224",
      "rows": [
        {
          "name": "Supply Voltage",
          "symbol": "VIN",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "min is VREG + 0.3V",
          "source_page": 5,
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        },
        {
          "name": "Supply Current - Charging",
          "symbol": "ISS",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 2500,
          "max": 3750,
          "conditions": "Charging",
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        },
        {
          "name": "Supply Current - Charge Complete",
          "symbol": "ISS",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 260,
          "max": 350,
          "conditions": "Charge Complete",
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        {
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          "kind": "electrical",
          "unit": "μA",
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          "conditions": "Standby",
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        },
        {
          "name": "Supply Current - Shutdown",
          "symbol": "ISS",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 28,
          "max": 50,
          "conditions": "Shutdown (VDD < VBAT – 100 mV or VDD < VSTOP)",
          "source_page": 5,
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        },
        {
          "name": "Regulated Charge Voltage (4.20V option)",
          "symbol": "VREG",
          "kind": "electrical",
          "unit": "V",
          "min": 4.179,
          "typ": 4.2,
          "max": 4.221,
          "conditions": "VDD = [VREG(typical) + 1V], IOUT = 10 mA, TA = -5°C to +55°C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Regulated Charge Voltage Tolerance",
          "symbol": "VRTOL",
          "kind": "tolerance",
          "unit": "%",
          "min": -0.5,
          "typ": null,
          "max": 0.5,
          "conditions": "TA = +25°C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Regulated Charge Voltage Tolerance",
          "symbol": "VRTOL",
          "kind": "tolerance",
          "unit": "%",
          "min": -0.75,
          "typ": null,
          "max": 0.75,
          "conditions": "TA = -5°C to +55°C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Line Regulation",
          "symbol": "ΔVBAT/VBAT/ΔVDD",
          "kind": "electrical",
          "unit": "%/V",
          "min": null,
          "typ": 0.08,
          "max": 0.2,
          "conditions": "VDD = [VREG(typical) + 1V] to 6V, IOUT = 10 mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation",
          "symbol": "ΔVBAT/VBAT",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.08,
          "max": 0.18,
          "conditions": "IOUT = 10 mA to 150 mA, VDD = [VREG(typical) + 1V]",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "AC-Adapter Fast Charge Current",
          "symbol": "IREG",
          "kind": "electrical",
          "unit": "mA",
          "min": 90,
          "typ": 100,
          "max": 110,
          "conditions": "PROG1 = 10 k, TA = -5°C to +55°C, SEL = Hi",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "AC-Adapter Fast Charge Current",
          "symbol": "IREG",
          "kind": "electrical",
          "unit": "mA",
          "min": 900,
          "typ": 1000,
          "max": 1100,
          "conditions": "PROG1 = 1 k, TA = -5°C to +55°C, SEL = Hi",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "USB Fast Charge Current",
          "symbol": "IREG",
          "kind": "electrical",
          "unit": "mA",
          "min": 80,
          "typ": 90,
          "max": 100,
          "conditions": "PROG2 = Low, SEL = Low, (Note 2), TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "USB Fast Charge Current",
          "symbol": "IREG",
          "kind": "electrical",
          "unit": "mA",
          "min": 400,
          "typ": 450,
          "max": 500,
          "conditions": "PROG2 = High, SEL = Low, (Note 2), TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "USB-Port Supply Current Limit",
          "symbol": "ILIMIT_USB",
          "kind": "electrical",
          "unit": "mA",
          "min": 80,
          "typ": 90,
          "max": 100,
          "conditions": "PROG2 = Low, SEL = Low, TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "USB-Port Supply Current Limit",
          "symbol": "ILIMIT_USB",
          "kind": "electrical",
          "unit": "mA",
          "min": 400,
          "typ": 450,
          "max": 500,
          "conditions": "PROG2 = High, SEL = Low, TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "AC-DC Adapter Current Limit",
          "symbol": "ILIMIT_AC",
          "kind": "electrical",
          "unit": "mA",
          "min": 1500,
          "typ": 1650,
          "max": 1800,
          "conditions": "SEL = High, TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VPCC Input Threshold Tolerance",
          "symbol": "VRTOL",
          "kind": "tolerance",
          "unit": "%",
          "min": -3,
          "typ": null,
          "max": 3,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VPCC Input Leakage Current",
          "symbol": "ILK",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "VVPCC = VDD",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Precondition Current Ratio",
          "symbol": "IPREG/IREG",
          "kind": "electrical",
          "unit": "%",
          "min": 7.5,
          "typ": 10,
          "max": 12.5,
          "conditions": "PROG1 = 1.0 k to 10 k, TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Precondition Current Threshold Ratio",
          "symbol": "VPTH/VREG",
          "kind": "electrical",
          "unit": "%",
          "min": 69,
          "typ": 72,
          "max": 75,
          "conditions": "VBAT Low-to-High",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Charge Termination Current",
          "symbol": "ITERM",
          "kind": "electrical",
          "unit": "mA",
          "min": 75,
          "typ": 100,
          "max": 125,
          "conditions": "PROG3 = 10 k, TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Charge Termination Current",
          "symbol": "ITERM",
          "kind": "electrical",
          "unit": "mA",
          "min": 7.5,
          "typ": 10,
          "max": 12.5,
          "conditions": "PROG3 = 100 k, TA = -5°C to +55°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Output Reverse Leakage Current - Shutdown",
          "symbol": "IDISCHARGE",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 30,
          "max": 40,
          "conditions": "Shutdown (VBAT < VDD < VUVLO)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output Reverse Leakage Current - No Load",
          "symbol": "IDISCHARGE",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 30,
          "max": 40,
          "conditions": "VBAT = Power Out, No Load",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output Reverse Leakage Current - Charge Complete",
          "symbol": "IDISCHARGE",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": -6,
          "max": -13,
          "conditions": "Charge Complete",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Status Indicator Sink Current",
          "symbol": "ISINK",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 16,
          "max": 35,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Status Indicator Low Output Voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.4,
          "max": 1,
          "conditions": "ISINK = 4 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Status Indicator Input Leakage Current",
          "symbol": "ILK",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "High Impedance, VDD on pin",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "PROG1 Charge Impedance Range",
          "symbol": "RPROG",
          "kind": "recommended_operating",
          "unit": "kΩ",
          "min": 1,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "PROG3 Termination Impedance Range",
          "symbol": "RPROG",
          "kind": "recommended_operating",
          "unit": "kΩ",
          "min": 5,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "PROG2 Input High Voltage Level",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "PROG2 Input Low Voltage Level",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "",
          "source_page": 7,
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        },
        {
          "name": "PROG2 Input Leakage Current",
          "symbol": "ILK",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "VPROG2 = VDD",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "TE Input High Voltage Level",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": null,
          "conditions": "Note 1",
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          "source": "datasheet"
        },
        {
          "name": "TE Input Low Voltage Level",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "Note 1",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "TE Input Leakage Current",
          "symbol": "ILK",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "VTE = VDD",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "CE Input High Voltage Level",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "CE Input Low Voltage Level",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "",
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        },
        {
          "name": "CE Input Leakage Current",
          "symbol": "ILK",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "VCE = VDD",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "SEL Input High Voltage Level",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": null,
          "conditions": "",
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        {
          "name": "SEL Input Low Voltage Level",
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          "unit": "V",
          "min": null,
          "typ": null,
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        },
        {
          "name": "SEL Input Leakage Current",
          "symbol": "ILK",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.01,
          "max": 1,
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