component
LAN8742A-CZ
Public Made by Adomby adom
Microchip Tech Ethernet Transceivers, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "LAN8742A-CZ",
"brief": "Microchip Tech Ethernet Transceivers, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
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"component": {
"mpn": "LAN8742A-CZ",
"manufacturer": "Microchip Tech",
"package": "QFN-24-EP(4x4)",
"pin_count": 25,
"category": "Interface",
"subcategory": "Ethernet Transceivers",
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"digikey": "LAN8742A-CZ-ND",
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"pins": [
{
"number": "1",
"name": "VDD2A",
"type": "power_in",
"description": "+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 (Link Speed) output after reset, configurable as nINT or nPME, and the nINTSEL strap when pulled high at reset, which must be tied to VDD2A rather than VDDIO."
},
{
"number": "3",
"name": "LED1/nINT/nPME/REGOFF",
"type": "bidirectional",
"description": "Multiplexed LED1 (Link Activity) output after reset, configurable as nINT or nPME, and the REGOFF strap that disables the internal +1.2 V regulator when pulled high at reset, which must be tied to VDD2A rather than VDDIO."
},
{
"number": "4",
"name": "XTAL2",
"type": "output",
"description": "Crystal oscillator output (OCLK) for the 25 MHz crystal."
},
{
"number": "5",
"name": "XTAL1/CLKIN",
"type": "input",
"description": "Crystal oscillator input (ICLK) that also accepts an external reference clock, with the positive voltage limit relative to ground stated as +3.6 V."
},
{
"number": "6",
"name": "VDDCR",
"type": "power_in",
"description": "+1.2 V digital core supply, provided by the on-chip regulator unless REGOFF configures regulator-off mode, with 1 µF and 470 pF decoupling capacitors recommended to ground."
},
{
"number": "7",
"name": "RXD1/MODE1",
"type": "bidirectional",
"description": "Bit 1 of the 2-bit RMII receive data output (VO8, 8 mA sink and source), also sampled as the MODE1 configuration strap with internal pull-up."
},
{
"number": "8",
"name": "RXD0/MODE0",
"type": "bidirectional",
"description": "Bit 0 of the 2-bit RMII receive data output (VO8, 8 mA sink and source), also sampled as the MODE0 configuration strap with internal pull-up."
},
{
"number": "9",
"name": "VDDIO",
"type": "power_in",
"description": "+1.8 V to +3.3 V variable I/O power supply for the digital pins."
},
{
"number": "10",
"name": "RXER/PHYAD0",
"type": "bidirectional",
"description": "RMII receive error output (VO8) asserted when an error is detected in the frame being transferred, also sampled as the PHYAD0 strap (VIS, internal pull-down) that sets the SMI address."
},
{
"number": "11",
"name": "CRS_DV/MODE2",
"type": "bidirectional",
"description": "Multiplexed with the MODE2 configuration strap that, together with MODE0 and MODE1, sets the default PHY mode; the CRS_DV RMII function is described on page 12, which is not in the supplied excerpt."
},
{
"number": "12",
"name": "MDIO",
"type": "bidirectional",
"description": "SMI management data input/output with VIS/VO8 buffer type and internal pull-up, per the Rev 1.1 revision history."
},
{
"number": "13",
"name": "MDC",
"type": "input",
"description": "Serial Management Interface clock input; its full description is in Table 2.3 on page 15, which is not in the supplied excerpt."
},
{
"number": "14",
"name": "nINT/REFCLKO",
"type": "output",
"description": "Multiplexed nINT (interrupt) or REFCLKO (reference clock output) function selected by the nINTSEL strap; nINT is not available on this pin when REF_CLK is sourced from an external 25 MHz clock."
},
{
"number": "15",
"name": "nRST",
"type": "input",
"description": "Active-low hardware reset input; configuration straps are latched on power-on reset and on pin reset."
},
{
"number": "16",
"name": "TXEN",
"type": "input",
"description": "RMII transmit enable input (VIS with internal pull-down) indicating that valid transmit data is present on TXD[1:0]."
},
{
"number": "17",
"name": "TXD0",
"type": "input",
"description": "RMII transmit data bit 0 from the MAC, received on a variable-voltage Schmitt-triggered input (VIS)."
},
{
"number": "18",
"name": "TXD1",
"type": "input",
"description": "RMII transmit data bit 1 from the MAC, received on a variable-voltage Schmitt-triggered input (VIS)."
},
{
"number": "19",
"name": "VDD1A",
"type": "power_in",
"description": "+3.3 V analog port power to Channel 1."
},
{
"number": "20",
"name": "TXN",
"type": "passive",
"description": "Negative leg of the differential MDI transmit pair that connects through the magnetics to the RJ45; its electrical limits are in Table 2.4 on page 15, which is not in the supplied excerpt."
},
{
"number": "21",
"name": "TXP",
"type": "passive",
"description": "Positive leg of the differential MDI transmit pair that connects through the magnetics to the RJ45; its electrical limits are in Table 2.4 on page 15, which is not in the supplied excerpt."
},
{
"number": "22",
"name": "RXN",
"type": "passive",
"description": "Negative leg of the differential MDI receive pair that connects through the magnetics to the RJ45; its electrical limits are in Table 2.4 on page 15, which is not in the supplied excerpt."
},
{
"number": "23",
"name": "RXP",
"type": "passive",
"description": "Positive leg of the differential MDI receive pair that connects through the magnetics to the RJ45; its electrical limits are in Table 2.4 on page 15, which is not in the supplied excerpt."
},
{
"number": "24",
"name": "RBIAS",
"type": "passive",
"description": "Connects the external bias reference resistor to the central bias circuit; its value is specified in Table 2.6 on page 16, which is not in the supplied excerpt."
},
{
"number": "25",
"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",
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"guards": "pin_guards 0.1: passed",
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"3/25 pins cited to the wrong page (name found elsewhere): ['4:XTAL2@p19', '11:CRS_DV/MODE2@p36', '15:nRST@p35']"
],
"pages_sent": 24,
"cost_usd": 0.1558,
"at": "2026-10-21T00:00:39"
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"Package": "QFN-24-EP(4x4)",
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{
"name": "Supply Voltage (VDDIO, VDD1A, VDD2A)",
"symbol": "",
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"name": "Ethernet Magnetics Supply Voltage",
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"name": "Negative voltage on input signal pins, with respect to ground",
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{
"name": "Positive voltage on XTAL1/CLKIN, with respect to ground",
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{
"name": "Storage Temperature",
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{
"name": "Analog Port Supply Voltage (VDD1A, VDD2A)",
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"typ": null,
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"source_page": 114,
"source": "datasheet"
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{
"name": "Digital Core Supply Voltage (VDDCR)",
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"source_page": 114,
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{
"name": "Ethernet Magnetics Supply Voltage",
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"min": 2.25,
"typ": null,
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"source_page": 114,
"source": "datasheet"
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{
"name": "Ambient Operating Temperature in Still Air (TA)",
"symbol": "TA",
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"unit": "°C",
"min": 0,
"typ": null,
"max": 70,
"conditions": "Commercial version (Note 5.4)",
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"source": "datasheet"
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{
"name": "Thermal Resistance",
"symbol": "ΘJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 55.3,
"max": null,
"conditions": "Measured in still air from the die to ambient air; multi-layer 2S2P PCB per JESD51",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Junction-to-Top-of-Package",
"symbol": "ΨJT",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 0.9,
"max": null,
"conditions": "Measured in still air",
"source_page": 114,
"source": "datasheet"
},
{
"name": "Schmitt Trigger Hysteresis (VIHT - VILT), IS type input buffer",
"symbol": "VHYS",
"kind": "electrical",
"unit": "mV",
"min": 336,
"typ": 399,
"max": 459,
"conditions": "Schmitt trigger",
"source_page": 117,
"source": "datasheet"
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{
"name": "Input Leakage, IS type input buffer",
"symbol": "IIH",
"kind": "electrical",
"unit": "µA",
"min": -10,
"typ": null,
"max": 10,
"conditions": "VIN = VSS or VDDIO",
"source_page": 117,
"source": "datasheet"
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{
"name": "Low Output Level, O12 buffer",
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"unit": "V",
"min": null,
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"max": 0.4,
"conditions": "IOL = 12 mA",
"source_page": 117,
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{
"name": "Low Input Level, ICLK buffer (XTAL1)",
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"min": -0.3,
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{
"name": "High Input Level, ICLK buffer (XTAL1)",
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{
"name": "Input Leakage, VIS type variable voltage input buffer",
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"conditions": "VIN = VSS or VDDIO",
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{
"name": "Low Input Level, VIS type variable voltage input buffer",
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{
"name": "High Input Level, VIS type variable voltage input buffer",
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{
"name": "Low Output Level, VO8 buffer",
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"min": null,
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{
"name": "Low Output Level, VOD8 buffer",
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"conditions": "IOL = 8 mA",
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},
{
"name": "Peak Differential Output Voltage High",
"symbol": "VPPH",
"kind": "electrical",
"unit": "mVpk",
"min": 950,
"typ": null,
"max": 1050,
"conditions": "Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor",
"source_page": 118,
"source": "datasheet"
},
{
"name": "Peak Differential Output Voltage Low",
"symbol": "VPPL",
"kind": "electrical",
"unit": "mVpk",
"min": -950,
"typ": null,
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"conditions": "Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor",
"source_page": 118,
"source": "datasheet"
},
{
"name": "Signal Amplitude Symmetry",
"symbol": "VSS",
"kind": "electrical",
"unit": "%",
"min": 98,
"typ": null,
"max": 102,
"conditions": "Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor",
"source_page": 118,
"source": "datasheet"
},
{
"name": "Signal Rise and Fall Time",
"symbol": "TRF",
"kind": "electrical",
"unit": "ns",
"min": 3,
"typ": null,
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"conditions": "Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor",
"source_page": 118,
"source": "datasheet"
},
{
"name": "Rise and Fall Symmetry",
"symbol": "TRFS",
"kind": "electrical",
"unit": "ns",
"min": null,
"typ": null,
"max": 0.5,
"conditions": "Measured at line side of transformer, line replaced by 100 Ω (±1%) resistor",
"source_page": 118,
"source": "datasheet"
},
{
"name": "Duty Cycle Distortion",
"symbol": "DCD",
"kind": "electrical",
"unit": "%",
"min": 35,
"typ": 50,
"max": 65,
"conditions": "Offset from 16 ns pulse width at 50% of pulse peak",
"source_page": 118,
"source": "datasheet"
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{
"name": "Overshoot and Undershoot",
"symbol": "VOS",
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"unit": "%",
"min": null,
"typ": null,
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"conditions": "",
"source_page": 118,
"source": "datasheet"
},
{
"name": "Transmitter Peak Differential Output Voltage",
"symbol": "VOUT",
"kind": "electrical",
"unit": "V",
"min": 2.2,
"typ": 2.5,
"max": 2.8,
"conditions": "Min/max guaranteed as measured with 100 Ω resistive load",
"source_page": 119,
"source": "datasheet"
},
{
"name": "Receiver Differential Squelch Threshold",
"symbol": "VDS",
"kind": "electrical",
"unit": "mV",
"min": 300,
"typ": 420,
"max": 585,
"conditions": "",
"source_page": 119,
"source": "datasheet"
},
{
"name": "Power supply turn on time",
"symbol": "tpon",
"kind": "timing",
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"min": null,
"typ": null,
"max": 50,
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{
"name": "Power supply turn off time",
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"typ": null,
"max": 500,
"conditions": "",
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},
{
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