component
LAN8742AI-CZ
Public Made by Adomby adom
Microchip Tech Ethernet ICs, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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"slug": "lan8742ai-cz",
"version": "0.1.0",
"type": "component",
"description": "Microchip Tech Ethernet ICs, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
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"lan8742ai-cz",
"factory-2.0.0",
"extractor-text"
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"dependencies": {},
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"component": {
"mpn": "LAN8742AI-CZ",
"manufacturer": "Microchip Tech",
"package": "QFN-24-EP(4x4)",
"pin_count": 25,
"category": "Interface ICs",
"subcategory": "Ethernet ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/c82f4f2c1e7f4181b4ed17be1ca7705c.pdf",
"parts": {
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"model_3d_step_plain": "lan8742ai-cz.step",
"lbr": "lan8742ai-cz.lbr"
},
"distributor_links": {
"lcsc": "C153279",
"digikey": "LAN8742AI-CZ-ND",
"mouser": "579-LAN8742AI-CZ"
},
"distributor_check": {
"checked_at": "2026-10-26T23:40:13Z",
"source": "Component Ocean /api/assign-pns",
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"pn": "LAN8742AI-CZ-ND",
"status": "found"
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"pins": [
{
"number": "1",
"name": "VDD2A",
"type": "power_in",
"description": "Supplies +3.3 V analog port power to Channel 2 and the internal regulator."
},
{
"number": "2",
"name": "LED2/nINT/nPME/nINTSEL",
"type": "bidirectional",
"description": "Multiplexed LED2 output (Link Speed by default) that also serves as nINT/nPME, and when high during reset it enables nINT/REFCLKO as nINT (section 3.8.1.3)."
},
{
"number": "3",
"name": "LED1/nINT/nPME/REGOFF",
"type": "bidirectional",
"description": "Multiplexed LED1 (Link Activity) output that also serves as nINT/nPME, and whose level during reset selects the internal 1.2 V regulator (REGOFF)."
},
{
"number": "4",
"name": "XTAL2",
"type": "output",
"description": "Crystal oscillator output pin (OCLK buffer type)."
},
{
"number": "5",
"name": "XTAL1/CLKIN",
"type": "input",
"description": "Crystal oscillator input pin (ICLK buffer type) that also accepts an external clock input."
},
{
"number": "6",
"name": "VDDCR",
"type": "power_in",
"description": "Supplies +1.2 V digital core power, from the on-chip regulator unless REGOFF disables it, and requires 1 µF and 470 pF decoupling capacitors in parallel to ground."
},
{
"number": "7",
"name": "RXD1/MODE1",
"type": "output",
"description": "Bit 1 of the 2-bit RMII receive data output (VO8, 8 mA), also latched as PHY operating mode configuration strap MODE1 at reset."
},
{
"number": "8",
"name": "RXD0/MODE0",
"type": "output",
"description": "Bit 0 of the 2-bit RMII receive data output (VO8, 8 mA), also latched as PHY operating mode configuration strap MODE0 at reset."
},
{
"number": "9",
"name": "VDDIO",
"type": "power_in",
"description": "Provides +1.8 V to +3.3 V variable I/O power."
},
{
"number": "10",
"name": "RXER/PHYAD0",
"type": "output",
"description": "Asserted to indicate that an error was detected in the frame being transferred from the transceiver, and multiplexed with the PHYAD0 address strap."
},
{
"number": "11",
"name": "CRS_DV/MODE2",
"type": "bidirectional",
"description": "Multiplexed pin carrying MODE[2] configuration strap latched at reset (Table 3.5); the CRS_DV function text is not in the supplied pages."
},
{
"number": "12",
"name": "MDIO",
"type": "bidirectional",
"description": "Serial management data I/O for the SMI; its electrical limits are not in the supplied pages."
},
{
"number": "13",
"name": "MDC",
"type": "input",
"description": "Serial management clock input for the SMI; its timing is specified in section 5.6.5 and its text is not in the supplied pages."
},
{
"number": "14",
"name": "nINT/REFCLKO",
"type": "bidirectional",
"description": "Multiplexed nINT or REF_CLK output pin, and nINT is not available on this pin when an external 25 MHz source is used."
},
{
"number": "15",
"name": "nRST",
"type": "input",
"description": "Active-low reset input, and configuration straps are latched on power-on reset and on nRST deassertion."
},
{
"number": "16",
"name": "TXEN",
"type": "input",
"description": "Indicates that valid transmission data is present on TXD[1:0] (VIS input with internal pull-down)."
},
{
"number": "17",
"name": "TXD0",
"type": "input",
"description": "The MAC transmits data to the transceiver using this signal (VIS input)."
},
{
"number": "18",
"name": "TXD1",
"type": "input",
"description": "The MAC transmits data to the transceiver using this signal (VIS input)."
},
{
"number": "19",
"name": "VDD1A",
"type": "power_in",
"description": "Supplies +3.3 V analog port power to Channel 1."
},
{
"number": "20",
"name": "TXN",
"type": "bidirectional",
"description": "Negative differential twisted-pair transmit/receive MDI pin that connects to the magnetics and RJ45 per the application diagram."
},
{
"number": "21",
"name": "TXP",
"type": "bidirectional",
"description": "Positive differential twisted-pair transmit/receive MDI pin that connects to the magnetics and RJ45 per the application diagram."
},
{
"number": "22",
"name": "RXN",
"type": "bidirectional",
"description": "Negative differential twisted-pair receive MDI pin that connects to the magnetics and RJ45 per the application diagram."
},
{
"number": "23",
"name": "RXP",
"type": "bidirectional",
"description": "Positive differential twisted-pair receive MDI pin that connects to the magnetics and RJ45 per the application diagram."
},
{
"number": "24",
"name": "RBIAS",
"type": "passive",
"description": "Bias resistor connection for the analog circuitry; its value is not in the supplied pages."
},
{
"number": "25",
"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: Pages 12-16 of the datasheet (Tables 2.1 continuation, 2.2 to 2.6) were not included in the supplied; The exposed pad (VSS) on the underside of the package is described as ground but has no printed pin ; Package identity: the ordering information (page 2) confirms LAN8742Ai-CZ is a 24-pin SQFN, RoHS pac",
"7/25 pins cited to the wrong page (name found elsewhere): ['4:XTAL2@p19', '11:CRS_DV/MODE2@p36', '15:nRST@p35', '20:TXN@p41']"
],
"pages_sent": 24,
"cost_usd": 0.0521,
"at": "2026-10-26T23:40:03"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/c82f4f2c1e7f4181b4ed17be1ca7705c.pdf",
"pages": 132,
"sha256": "7f3c0c1f27c20293",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 25,
"described": 25,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
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