component
XR21B1411IL16-F
Public Made by Adomby adom
MaxLinear USB ICs, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "xr21b1411il16-f",
"title": "XR21B1411IL16-F",
"brief": "MaxLinear USB ICs, QFN-16-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
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"interface ics",
"xr21b1411il16-f",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "XR21B1411IL16-F",
"manufacturer": "MaxLinear",
"package": "QFN-16-EP(3x3)",
"pin_count": 17,
"category": "Interface ICs",
"subcategory": "USB ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/65880583bfc2a5ef92da7a920f3beecb.pdf",
"parts": {
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"lbr": "xr21b1411il16-f.lbr"
},
"distributor_links": {
"lcsc": "C1521587",
"digikey": "1016-1388-ND",
"mouser": "701-XR21B1411IL16-F"
},
"distributor_check": {
"checked_at": "2026-10-30T22:48:55Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "1016-1388-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "701-XR21B1411IL16-F",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "LOWPOWER",
"type": "output",
"description": "Asserted whenever it is not safe to draw the current requested in the Device Maximum Power field from VBUS; the default polarity is active low and may be changed via OTP, and high-power applications tie it to VIO_REF or GND through a weak 10K resistor to match the asserted state."
},
{
"number": "2",
"name": "NC",
"type": "unconnected",
"description": "No connect pin."
},
{
"number": "3",
"name": "GPIO5/RTS#/RS485",
"type": "bidirectional",
"description": "General-purpose I/O, or RTS# output (active low) for hardware flow control, or auto RS-485 half-duplex control; it has an OTP-programmable pull-up or pull-down and its state is undefined during USB bus reset and POR, so a weak external resistor is needed for a defined state."
},
{
"number": "4",
"name": "GPIO4/CTS#",
"type": "bidirectional",
"description": "General-purpose I/O or UART Clear-to-Send input (active low) for hardware flow control, with an OTP-programmable pull-up or pull-down; its state is undefined during USB bus reset and POR."
},
{
"number": "5",
"name": "GPIO3/DTR#",
"type": "bidirectional",
"description": "General-purpose I/O or UART Data-Terminal-Ready output (active low), with an OTP-programmable pull-up or pull-down; it is automatically configured as an output when using the standard CDC-ACM driver."
},
{
"number": "6",
"name": "GPIO2/DSR#",
"type": "bidirectional",
"description": "General-purpose I/O or UART Data-Set-Ready input (active low) for DTR/DSR hardware flow control, with an OTP-programmable pull-up or pull-down."
},
{
"number": "7",
"name": "GPIO1/CD#",
"type": "bidirectional",
"description": "General-purpose I/O or UART Carrier-Detect input (active low), with an OTP-programmable pull-up or pull-down."
},
{
"number": "8",
"name": "GPIO0/RI#/RWK#",
"type": "bidirectional",
"description": "General-purpose I/O, UART Ring-Indicator input (active low), or Remote Wakeup input used to signal the USB host to exit Suspend, with an OTP-programmable pull-up or pull-down."
},
{
"number": "9",
"name": "TX",
"type": "output",
"description": "UART Transmit Data output."
},
{
"number": "10",
"name": "RX",
"type": "input",
"description": "UART Receive Data input with an OTP-programmable pull-up or pull-down; the pull-up is disabled without a valid voltage on VIO_REF."
},
{
"number": "11",
"name": "VBUS_SENSE",
"type": "input",
"description": "VBUS sense input that disables the USBD+ pull-up when VBUS is absent in self-powered mode; it must be fed through a divider so VBUS_SENSE = VIO_REF with VBUS = 5V, must be enabled via OTP, and must be tied to a defined logic state in bus-powered mode."
},
{
"number": "12",
"name": "VIO_REF",
"type": "power_in",
"description": "Reference voltage for the modem I/O signals, with a voltage range of +1.6 V to +3.6 V."
},
{
"number": "13",
"name": "GND",
"type": "power_in",
"description": "Power supply common ground."
},
{
"number": "14",
"name": "USBD-",
"type": "bidirectional",
"description": "USB port differential data negative signal, with ±15 kV HBM ESD protection."
},
{
"number": "15",
"name": "USBD+",
"type": "bidirectional",
"description": "USB port differential data positive signal with an internal USB 2.0-compliant pull-up resistor and ±15 kV HBM ESD protection."
},
{
"number": "16",
"name": "VCC",
"type": "power_in",
"description": "5 V power supply with an input voltage range of +4.4 V to +5.25 V."
},
{
"number": "17",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
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"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 GND center pad (exposed thermal pad on the QFN underside) is listed in the datasheet as a pin ty; The datasheet pin table gives the 16-QFN pin numbers and the pinout diagram, but the types for the G",
"exposed pad 17 added from the footprint"
],
"pages_sent": 9,
"cost_usd": 0.0522,
"at": "2026-10-30T22:48:35"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/65880583bfc2a5ef92da7a920f3beecb.pdf",
"pages": 31,
"sha256": "2348f9f0dde10db6",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
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"described": 17,
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "3eb81ffac423a66cdcfead8efe56401da171edaf1f2257049aad7b2d3900f6c8",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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{
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"package_dims": {
"package_code": "16-pin QFN 3x3x0.9 mm (POD-00000138)",
"source_page": 29,
"D": {
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"E1": {
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null,
null
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"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "xr21b1411il16-f.step",
"verdict": "PASS",
"reasons": [
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}
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"metadata": {
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"Package": "QFN-16-EP(3x3)",
"Category": "Interface ICs",
"Pins": "17"
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"rows": [
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"name": "Power Supply Current",
"symbol": "ICC",
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"unit": "mA",
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{
"name": "Input Low Voltage (UART/GPIO)",
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"min": -0.3,
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{
"name": "Input Low Voltage (UART/GPIO), upper limit",
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"unit": "x VIO_REF",
"min": null,
"typ": null,
"max": 0.25,
"conditions": "Printed as 0.25 * VIO_REF; VIO_REF = 1.6V - 3.6V",
"source_page": 27,
"source": "datasheet"
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"name": "Input High Voltage (UART/GPIO), lower limit",
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"kind": "electrical",
"unit": "x VIO_REF",
"min": 0.7,
"typ": null,
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"conditions": "Printed as 0.70 * VIO_REF; VIO_REF = 1.6V - 3.6V",
"source_page": 27,
"source": "datasheet"
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{
"name": "Output Low Voltage (UART/GPIO)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.3,
"conditions": "IOL = 1 mA, VIO_REF = 1.6V",
"source_page": 27,
"source": "datasheet"
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{
"name": "Output Low Voltage (UART/GPIO)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.5,
"conditions": "IOL = 4 mA, VIO_REF = 3.6V",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Output High Voltage (UART/GPIO)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 1.3,
"typ": null,
"max": null,
"conditions": "IOH = -400 uA, VIO_REF = 1.6V",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Output High Voltage (UART/GPIO)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 2.8,
"typ": null,
"max": null,
"conditions": "IOH = -1.5 mA, VIO_REF = 3.6V",
"source_page": 27,
"source": "datasheet"
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{
"name": "Input Low Leakage Current",
"symbol": "IIL",
"kind": "electrical",
"unit": "uA",
"min": -10,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input High Leakage Current",
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"kind": "electrical",
"unit": "uA",
"min": -10,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input Pin Capacitance",
"symbol": "CIN",
"kind": "electrical",
"unit": "pF",
"min": null,
"typ": null,
"max": 5,
"conditions": "",
"source_page": 27,
"source": "datasheet"
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{
"name": "Input Low Voltage (USB I/O)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 0.8,
"conditions": "VCC 4.4V - 5.25V, TA -40 to +85C",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Input High Voltage (USB I/O)",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 2,
"typ": null,
"max": 5.25,
"conditions": "VCC 4.4V - 5.25V, TA -40 to +85C",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Output Low Voltage (USB I/O)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": 0,
"typ": null,
"max": 0.3,
"conditions": "External 1.5 K Ohm to 3.6V on USBD- pin",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Output High Voltage (USB I/O)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 2.8,
"typ": null,
"max": 3.6,
"conditions": "External 15 K Ohm to GND on USBD- pin",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Driver Output Impedance",
"symbol": "VDrvZ",
"kind": "electrical",
"unit": "Ω",
"min": 28,
"typ": null,
"max": 44,
"conditions": "",
"source_page": 28,
"source": "datasheet"
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{
"name": "Open short current",
"symbol": "IOSC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 38.5,
"conditions": "1.5 V on USBD+ and USBD-",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Vcc Supply Voltage",
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"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": 5.75,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input Voltage (all pins except USBD+ and USBD-)",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input Voltage (USBD+ and USBD-)",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 5.75,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Junction Temperature",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Supply Voltage",
"symbol": "VCC",
"kind": "recommended_operating",
"unit": "V",
"min": 4.4,
"typ": null,
"max": 5.25,
"conditions": "Unless otherwise noted, TA = -40 to +85C",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Reference Voltage (VIO_REF)",
"symbol": "VIO_REF",
"kind": "recommended_operating",
"unit": "V",
"min": 1.6,
"typ": null,
"max": 3.6,
"conditions": "Used for UART/GPIO pins",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Operating Temperature Range",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "Ordering part XR21B1411IL16-F",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Thermal resistance, junction to ambient",
"symbol": "θJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 36.4,
"max": null,
"conditions": "QFN16 3x3; typical value",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Thermal resistance, junction to case",
"symbol": "θJC",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 17.8,
"max": null,
"conditions": "QFN16 3x3; typical value",
"source_page": 29,
"source": "datasheet"
}
]
}
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