LAN8742A-CZ

{
  "slug": "lan8742a-cz",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Ethernet Transceivers, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface",
    "lan8742a-cz",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lan8742a-cz.kicad_sym",
    "lan8742a-cz.kicad_mod",
    "lan8742a-cz.glb",
    "lan8742a-cz.step",
    "lan8742a-cz.lbr",
    "docs/hero.png",
    "docs/lan8742a-cz-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lan8742a-cz-hero.glb",
    "lan8742a-cz-hero.overlay.json",
    "lan8742a-cz-etched.glb"
  ],
  "component": {
    "mpn": "LAN8742A-CZ",
    "manufacturer": "Microchip Tech",
    "package": "QFN-24-EP(4x4)",
    "pin_count": 25,
    "category": "Interface",
    "subcategory": "Ethernet Transceivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884593767931904",
    "parts": {
      "symbol": "lan8742a-cz.kicad_sym",
      "footprint": "lan8742a-cz.kicad_mod",
      "model_3d": "lan8742a-cz-hero.glb",
      "model_3d_plain": "lan8742a-cz-etched.glb",
      "model_3d_step": "lan8742a-cz-etched.step",
      "model_3d_step_plain": "lan8742a-cz.step",
      "lbr": "lan8742a-cz.lbr"
    },
    "distributor_links": {
      "lcsc": "C220794",
      "digikey": "LAN8742A-CZ-ND",
      "mouser": "579-LAN8742A-CZ"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T00:04:16Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LAN8742A-CZ-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "579-LAN8742A-CZ",
        "status": "found"
      }
    },
    "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)."
      }
    ],
    "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 to 16 (rest of Table 2.1, Tables 2.2 to 2.6) are not in the supplied excerpt. Descriptions ; The exposed pad (VSS) is not numbered on the package, so it is not listed as a pin. The datasheet sa; Multiplexed pins are assigned a single KiCad type, but the datasheet gives a different buffer per fu",
          "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"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884593767931904",
        "pages": 132,
        "sha256": "7f3c0c1f27c20293",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 25,
        "described": 25,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lan8742a-cz.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "096fc110543e6d324c5120c2d38e3dca87a389da9b6fac234f1fe40856295ef4",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lan8742a-cz-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "98e17d00fa7602e91a482bcbd1e95049b2a214a2f3b237f5349b9e309b2deab1",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}