component
MCP73871-2CAI
Public Made by Adomby adom
MICROCHIP TECHNOLOGY Global Sourcing Parts, QFN-20(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"title": "MCP73871-2CAI",
"brief": "MICROCHIP TECHNOLOGY Global Sourcing Parts, QFN-20(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"manufacturer": "MICROCHIP TECHNOLOGY",
"package": "QFN-20(4x4)",
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"category": "Global Sourcing Parts",
"subcategory": "Global Sourcing Parts",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/c4ab4be7edaa6aa125235ba8ad6da067.pdf",
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"source": "Component Ocean /api/assign-pns",
"digikey": {
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},
"pins": [
{
"number": "1",
"name": "OUT",
"type": "power_out",
"description": "System output terminal that powers the system while the battery is charged independently; bypass to VSS with a minimum of 4.7 µF is recommended."
},
{
"number": "2",
"name": "VPCC",
"type": "input",
"description": "Voltage proportional charge control input; supplying 1.23V or greater enables the feature, and connecting it to IN disables the feature."
},
{
"number": "3",
"name": "SEL",
"type": "input",
"description": "Input source type selection: low for a USB port input, high for an AC-DC adapter input."
},
{
"number": "4",
"name": "PROG2",
"type": "input",
"description": "USB port input current limit selection when SEL is low: low = 100 mA, high = 500 mA."
},
{
"number": "5",
"name": "THERM",
"type": "bidirectional",
"description": "Thermistor monitoring input and bias current for the battery cell temperature monitor."
},
{
"number": "6",
"name": "PG",
"type": "output",
"description": "Power Good status output (open-drain); low when the input is above the UVLO threshold and greater than the battery voltage."
},
{
"number": "7",
"name": "STAT2",
"type": "output",
"description": "Charge Status Output 2 (open-drain) for an LED or a pull-up resistor to a host microcontroller."
},
{
"number": "8",
"name": "STAT1/LBO",
"type": "output",
"description": "Charge Status Output 1 (open-drain); functions as the low battery output indicator when VBAT > VIN."
},
{
"number": "9",
"name": "TE",
"type": "input",
"description": "Timer Enable input; enables the safety timer when active-low."
},
{
"number": "10",
"name": "VSS",
"type": "power_in",
"description": "Battery management 0V reference, connected to the negative terminal of the battery, system load and input supply."
},
{
"number": "11",
"name": "VSS",
"type": "power_in",
"description": "Battery management 0V reference, connected to the 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 with SEL high and preconditioning set point for both USB port and AC-DC adapter; maximum constant charge current is set by a resistor from PROG1 to VSS."
},
{
"number": "14",
"name": "VBAT",
"type": "power_in",
"description": "Battery positive input and output connection; bypass to VSS with a minimum of 4.7 µF to ensure loop stability when the battery is disconnected."
},
{
"number": "15",
"name": "VBAT",
"type": "power_in",
"description": "Battery positive input and output connection; bypass to VSS with a minimum of 4.7 µF to ensure loop stability when the battery is disconnected."
},
{
"number": "16",
"name": "VBAT_SENSE",
"type": "bidirectional",
"description": "Battery voltage sense; connect to the positive battery terminal, where a precision internal sense regulates the final voltage to VREG."
},
{
"number": "17",
"name": "CE",
"type": "input",
"description": "Device Charge Enable input; charging is enabled when CE is high."
},
{
"number": "18",
"name": "IN",
"type": "power_in",
"description": "Power supply input; a supply of VREG + 0.3V to 6V is recommended, bypassed to VSS with a minimum of 4.7 µF."
},
{
"number": "19",
"name": "IN",
"type": "power_in",
"description": "Power supply input; a supply of VREG + 0.3V to 6V is recommended, bypassed to VSS with a minimum of 4.7 µF."
},
{
"number": "20",
"name": "OUT",
"type": "power_out",
"description": "System output terminal that powers the system while the battery is charged independently; bypass to VSS with a minimum of 4.7 µF is recommended."
},
{
"number": "21",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
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"factory_chain": {
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"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 datasheet labels IN as 'I' and OUT as 'O' in Table 3-1; they were mapped to KiCad power_in and p; The exposed pad (EP) is not a numbered pin in the package. It is listed in the pin table as 'EP' and; The pages supplied (1, 13-15, 25-28) confirm the 20-lead QFN 4x4 mm (ML) package and its pinout. The",
"exposed pad 21 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint"
],
"pages_sent": 8,
"cost_usd": 0.0516,
"at": "2026-10-29T00:24:49"
},
"datasheet": {
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"pages": 36,
"sha256": "56654f56a8ac83ad",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
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"seat": "z = 0",
"extents_mm": [
4,
4,
0.77
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
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{
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],
"package_dims": {
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"D": {
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},
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},
"A": {
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},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
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"metadata": {
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"Package": "QFN-20(4x4)",
"Category": "Global Sourcing Parts",
"Pins": "21"
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"rows": [
{
"name": "Storage Temperature Range",
"symbol": "TA",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
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"conditions": "",
"source_page": 4,
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{
"name": "Operating Temperature Range",
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"unit": "°C",
"min": -40,
"typ": null,
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"conditions": "",
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{
"name": "Supply Voltage (absolute maximum)",
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{
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{
"name": "Supply Voltage",
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"min": null,
"typ": null,
"max": 6,
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"source_page": 4,
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{
"name": "Supply Current - Charging",
"symbol": "ISS",
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"min": null,
"typ": 2500,
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{
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{
"name": "Supply Current - Standby",
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"unit": "µA",
"min": null,
"typ": 180,
"max": 300,
"conditions": "Standby",
"source_page": 4,
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{
"name": "Supply Current - Shutdown",
"symbol": "ISS",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 28,
"max": 50,
"conditions": "(VDD < VBAT – 100 mV or VDD < VSTOP)",
"source_page": 4,
"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": 4,
"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": 4,
"source": "datasheet"
},
{
"name": "Line Regulation",
"symbol": "",
"kind": "electrical",
"unit": "%/V",
"min": null,
"typ": 0.08,
"max": 0.2,
"conditions": "VDD = [VREG(typical) + 1V] to 6V, IOUT = 10 mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Load Regulation",
"symbol": "",
"kind": "electrical",
"unit": "%",
"min": null,
"typ": 0.08,
"max": 0.18,
"conditions": "IOUT = 10 mA to 150 mA, VDD = [VREG(typical) + 1V]",
"source_page": 4,
"source": "datasheet"
},
{
"name": "AC-Adapter Fast Charge Current",
"symbol": "IREG",
"kind": "electrical",
"unit": "mA",
"min": 90,
"typ": 100,
"max": 110,
"conditions": "PROG1 = 10 kΩ, TA = -5°C to +55°C, SEL = High",
"source_page": 5,
"source": "datasheet"
},
{
"name": "AC-Adapter Fast Charge Current",
"symbol": "IREG",
"kind": "electrical",
"unit": "mA",
"min": 900,
"typ": 1000,
"max": 1100,
"conditions": "PROG1 = 1 kΩ, TA = -5°C to +55°C, SEL = High",
"source_page": 5,
"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": 5,
"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": 5,
"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": 5,
"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": 5,
"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": 5,
"source": "datasheet"
},
{
"name": "VPCC Input Threshold Tolerance",
"symbol": "VRTOL",
"kind": "tolerance",
"unit": "%",
"min": -3,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Input Leakage Current (VPCC)",
"symbol": "ILK",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.01,
"max": 1,
"conditions": "VVPCC = VDD",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Precondition Current Ratio",
"symbol": "IPREG/IREG",
"kind": "electrical",
"unit": "%",
"min": 7.5,
"typ": 10,
"max": 12.5,
"conditions": "PROG1 = 1.0 kΩ to 10 kΩ, TA = -5°C to +55°C",
"source_page": 5,
"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": 5,
"source": "datasheet"
},
{
"name": "Charge Termination Current Ratio",
"symbol": "ITERM",
"kind": "electrical",
"unit": "mA",
"min": 75,
"typ": 100,
"max": 125,
"conditions": "PROG3 = 10 kΩ, TA = -5°C to +55°C",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Charge Termination Current Ratio",
"symbol": "ITERM",
"kind": "electrical",
"unit": "mA",
"min": 7.5,
"typ": 10,
"max": 12.5,
"conditions": "PROG3 = 100 kΩ, TA = -5°C to +55°C",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Output Reverse Leakage Current",
"symbol": "IDISCHARGE",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 30,
"max": 40,
"conditions": "Shutdown (VBAT < VDD < VUVLO)",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Reverse Leakage Current",
"symbol": "IDISCHARGE",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": -6,
"max": -13,
"conditions": "Charge Complete",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Sink Current",
"symbol": "ISINK",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 16,
"max": 35,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Low Output Voltage",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 0.4,
"max": 1,
"conditions": "ISINK = 4 mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Leakage Current (Status Indicators)",
"symbol": "ILK",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 0.01,
"max": 1,
"conditions": "High Impedance, VDD on pin",
"source_page": 6,
"source": "datasheet"
},
{
"name": "PROG1 Charge Impedance Range",
"symbol": "RPROG",
"kind": "electrical",
"unit": "kΩ",
"min": 1,
"typ": null,
"max": 20,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "PROG3 Termination Impedance Range",
"symbol": "RPROG",
"kind": "electrical",
"unit": "kΩ",
"min": 5,
"typ": null,
"max": 100,
"conditions": "",
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"source": "datasheet"
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