component
MCP73871-2AAI
Public Made by Adomby adom
Microchip Tech Battery Management ICs, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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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",
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"checked_at": "2026-10-27T01:21:19Z",
"source": "Component Ocean /api/assign-pns",
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"pn": null,
"status": "no match"
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"mouser": {
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"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)."
}
],
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"primary_model": "claude-sonnet-5-5",
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"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
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],
"pages_sent": 8,
"cost_usd": 0.0896,
"at": "2026-10-27T01:20:53"
},
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"pages": 40,
"sha256": "bc4dc7e5bca1f6a2",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
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