KSZ9021GN

{
  "slug": "ksz9021gn",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Ethernet Transceivers, QFN-64-EP(8x8). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface",
    "ksz9021gn",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ksz9021gn.kicad_sym",
    "ksz9021gn.kicad_mod",
    "ksz9021gn.glb",
    "ksz9021gn.step",
    "ksz9021gn.lbr",
    "docs/hero.png",
    "docs/ksz9021gn-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ksz9021gn-hero.glb",
    "ksz9021gn-hero.overlay.json",
    "ksz9021gn-etched.glb"
  ],
  "component": {
    "mpn": "KSZ9021GN",
    "manufacturer": "Microchip Tech",
    "package": "QFN-64-EP(8x8)",
    "pin_count": 65,
    "category": "Interface",
    "subcategory": "Ethernet Transceivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883941881761792",
    "parts": {
      "symbol": "ksz9021gn.kicad_sym",
      "footprint": "ksz9021gn.kicad_mod",
      "model_3d": "ksz9021gn-hero.glb",
      "model_3d_plain": "ksz9021gn-etched.glb",
      "model_3d_step": "ksz9021gn-etched.step",
      "model_3d_step_plain": "ksz9021gn.step",
      "lbr": "ksz9021gn.lbr"
    },
    "distributor_links": {
      "lcsc": "C220829"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T18:18:03Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "AVDDH",
        "type": "power_in",
        "description": "3.3V analog VDD."
      },
      {
        "number": "2",
        "name": "TXRXP_A",
        "type": "bidirectional",
        "description": "Media Dependent Interface[0], positive signal of differential pair; BI_DA+ (MDI) or BI_DB+ (MDI-X) in 1000Base-T, TX+/RX+ in 10/100."
      },
      {
        "number": "3",
        "name": "TXRXM_A",
        "type": "bidirectional",
        "description": "Media Dependent Interface[0], negative signal of differential pair; BI_DA- (MDI) or BI_DB- (MDI-X) in 1000Base-T, TX-/RX- in 10/100."
      },
      {
        "number": "4",
        "name": "AVDDL",
        "type": "power_in",
        "description": "1.2V analog VDD."
      },
      {
        "number": "5",
        "name": "AVDDL",
        "type": "power_in",
        "description": "1.2V analog VDD."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect."
      },
      {
        "number": "7",
        "name": "TXRXP_B",
        "type": "bidirectional",
        "description": "Media Dependent Interface[1], positive signal of differential pair; BI_DB+ (MDI) or BI_DA+ (MDI-X) in 1000Base-T, RX+/TX+ in 10/100."
      },
      {
        "number": "8",
        "name": "TXRXM_B",
        "type": "bidirectional",
        "description": "Media Dependent Interface[1], negative signal of differential pair; BI_DB- (MDI) or BI_DA- (MDI-X) in 1000Base-T, RX-/TX- in 10/100."
      },
      {
        "number": "9",
        "name": "AGNDH",
        "type": "power_in",
        "description": "Analog ground."
      },
      {
        "number": "10",
        "name": "TXRXP_C",
        "type": "bidirectional",
        "description": "Media Dependent Interface[2], positive signal of differential pair; BI_DC+ (MDI) or BI_DD+ (MDI-X) in 1000Base-T, not used in 10/100."
      },
      {
        "number": "11",
        "name": "TXRXM_C",
        "type": "bidirectional",
        "description": "Media Dependent Interface[2], negative signal of differential pair; BI_DC- (MDI) or BI_DD- (MDI-X) in 1000Base-T, not used in 10/100."
      },
      {
        "number": "12",
        "name": "AVDDL",
        "type": "power_in",
        "description": "1.2V analog VDD."
      },
      {
        "number": "13",
        "name": "AVDDL",
        "type": "power_in",
        "description": "1.2V analog VDD."
      },
      {
        "number": "14",
        "name": "TXRXP_D",
        "type": "bidirectional",
        "description": "Media Dependent Interface[3], positive signal of differential pair; BI_DD+ (MDI) or BI_DC+ (MDI-X) in 1000Base-T, not used in 10/100."
      },
      {
        "number": "15",
        "name": "TXRXM_D",
        "type": "bidirectional",
        "description": "Media Dependent Interface[3], negative signal of differential pair; BI_DD- (MDI) or BI_DC- (MDI-X) in 1000Base-T, not used in 10/100."
      },
      {
        "number": "16",
        "name": "AVDDH",
        "type": "power_in",
        "description": "3.3V analog VDD."
      },
      {
        "number": "17",
        "name": "LED2/PHYAD1",
        "type": "bidirectional",
        "description": "Programmable LED2 output, and PHYAD[1] strap latched during power-up/reset."
      },
      {
        "number": "18",
        "name": "DVDDH",
        "type": "power_in",
        "description": "3.3V or 2.5V digital VDD."
      },
      {
        "number": "19",
        "name": "LED1/PHYAD0",
        "type": "bidirectional",
        "description": "Programmable LED1 output, and PHYAD[0] strap latched during power-up/reset."
      },
      {
        "number": "20",
        "name": "DVDDL",
        "type": "power_in",
        "description": "1.2V digital VDD."
      },
      {
        "number": "21",
        "name": "TXD0",
        "type": "input",
        "description": "GMII/MII transmit data 0 input."
      },
      {
        "number": "22",
        "name": "TXD1",
        "type": "input",
        "description": "GMII/MII transmit data 1 input."
      },
      {
        "number": "23",
        "name": "TXD2",
        "type": "input",
        "description": "GMII/MII transmit data 2 input."
      },
      {
        "number": "24",
        "name": "TXD3",
        "type": "input",
        "description": "GMII/MII transmit data 3 input."
      },
      {
        "number": "25",
        "name": "DVDDL",
        "type": "power_in",
        "description": "1.2V digital VDD."
      },
      {
        "number": "26",
        "name": "TXD4",
        "type": "input",
        "description": "GMII transmit data 4 input; not used in MII mode and can be driven high or low."
      },
      {
        "number": "27",
        "name": "TXD5",
        "type": "input",
        "description": "GMII transmit data 5 input; not used in MII mode and can be driven high or low."
      },
      {
        "number": "28",
        "name": "TXD6",
        "type": "input",
        "description": "GMII transmit data 6 input; not used in MII mode and can be driven high or low."
      },
      {
        "number": "29",
        "name": "TXD7",
        "type": "input",
        "description": "GMII transmit data 7 input; not used in MII mode and can be driven high or low."
      },
      {
        "number": "30",
        "name": "DVDDH",
        "type": "power_in",
        "description": "3.3V or 2.5V digital VDD."
      },
      {
        "number": "31",
        "name": "TX_ER",
        "type": "input",
        "description": "GMII/MII transmit error input; tie low if the MAC does not provide TX_ER."
      },
      {
        "number": "32",
        "name": "GTX_CLK",
        "type": "input",
        "description": "GMII transmit reference clock input (125MHz for 1000Mbps), sourced by the MAC."
      },
      {
        "number": "33",
        "name": "TX_EN",
        "type": "input",
        "description": "GMII/MII transmit enable input."
      },
      {
        "number": "34",
        "name": "RXD7",
        "type": "output",
        "description": "GMII receive data 7 output; not used in MII mode and driven low."
      },
      {
        "number": "35",
        "name": "RXD6",
        "type": "output",
        "description": "GMII receive data 6 output; not used in MII mode and driven low."
      },
      {
        "number": "36",
        "name": "DVDDL",
        "type": "power_in",
        "description": "1.2V digital VDD."
      },
      {
        "number": "37",
        "name": "RXD5",
        "type": "output",
        "description": "GMII receive data 5 output; not used in MII mode and driven low."
      },
      {
        "number": "38",
        "name": "RXD4",
        "type": "output",
        "description": "GMII receive data 4 output; not used in MII mode and driven low."
      },
      {
        "number": "39",
        "name": "RXD3/MODE3",
        "type": "bidirectional",
        "description": "GMII/MII receive data 3 output, and MODE3 strap latched during power-up/reset."
      },
      {
        "number": "40",
        "name": "DVDDH",
        "type": "power_in",
        "description": "3.3V or 2.5V digital VDD."
      },
      {
        "number": "41",
        "name": "RXD2/MODE2",
        "type": "bidirectional",
        "description": "GMII/MII receive data 2 output, and MODE2 strap latched during power-up/reset."
      },
      {
        "number": "42",
        "name": "DVDDL",
        "type": "power_in",
        "description": "1.2V digital VDD."
      },
      {
        "number": "43",
        "name": "RXD1/MODE1",
        "type": "bidirectional",
        "description": "GMII/MII receive data 1 output, and MODE1 strap latched during power-up/reset."
      },
      {
        "number": "44",
        "name": "RXD0/MODE0",
        "type": "bidirectional",
        "description": "GMII/MII receive data 0 output, and MODE0 strap latched during power-up/reset."
      },
      {
        "number": "45",
        "name": "RX_DV/CLK125_EN",
        "type": "bidirectional",
        "description": "GMII/MII receive data valid output, and CLK125_EN strap (pull-up enables 125MHz clock output) latched during power-up/reset."
      },
      {
        "number": "46",
        "name": "DVDDH",
        "type": "power_in",
        "description": "3.3V or 2.5V digital VDD."
      },
      {
        "number": "47",
        "name": "RX_ER",
        "type": "output",
        "description": "GMII/MII receive error output."
      },
      {
        "number": "48",
        "name": "RX_CLK/PHYAD2",
        "type": "bidirectional",
        "description": "GMII/MII receive reference clock output, and PHYAD[2] strap latched during power-up/reset."
      },
      {
        "number": "49",
        "name": "CRS",
        "type": "output",
        "description": "GMII/MII carrier sense output."
      },
      {
        "number": "50",
        "name": "MDC",
        "type": "input",
        "description": "Management data clock input (internal pull-up), reference clock for MDIO."
      },
      {
        "number": "51",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "Management data input/output (internal pull-up), synchronous to MDC; requires external pull-up to DVDDH of 1.0KΩ to 4.7KΩ."
      },
      {
        "number": "52",
        "name": "COL",
        "type": "output",
        "description": "GMII/MII collision detected output."
      },
      {
        "number": "53",
        "name": "INT_N",
        "type": "output",
        "description": "Programmable interrupt output; requires external pull-up to DVDDH of 1.0KΩ to 4.7KΩ when active low."
      },
      {
        "number": "54",
        "name": "DVDDL",
        "type": "power_in",
        "description": "1.2V digital VDD."
      },
      {
        "number": "55",
        "name": "CLK125_NDO/LED_MODE",
        "type": "bidirectional",
        "description": "125MHz reference clock output for the MAC, and LED_MODE strap latched during power-up/reset (pull-up = Single LED, pull-down = Tri-color Dual LED)."
      },
      {
        "number": "56",
        "name": "RESET_N",
        "type": "input",
        "description": "Chip reset, active low (internal pull-up); strap-ins are latched at the rising edge."
      },
      {
        "number": "57",
        "name": "TX_CLK",
        "type": "output",
        "description": "MII transmit reference clock output."
      },
      {
        "number": "58",
        "name": "LDO_O",
        "type": "output",
        "description": "On-chip 1.2V LDO controller output driving the gate of a P-channel MOSFET; can be left floating if 1.2V is provided by the system."
      },
      {
        "number": "59",
        "name": "AVDDL_PLL",
        "type": "power_in",
        "description": "1.2V analog VDD for PLL."
      },
      {
        "number": "60",
        "name": "XO",
        "type": "output",
        "description": "25MHz crystal feedback; no connect if oscillator or external clock source is used."
      },
      {
        "number": "61",
        "name": "XI",
        "type": "input",
        "description": "Crystal/oscillator/external clock input, 25MHz +/-50ppm tolerance."
      },
      {
        "number": "62",
        "name": "AVDDH",
        "type": "power_in",
        "description": "3.3V analog VDD."
      },
      {
        "number": "63",
        "name": "ISET",
        "type": "bidirectional",
        "description": "Sets transmit output level; connect a 4.99KΩ 1% resistor to ground."
      },
      {
        "number": "64",
        "name": "AGNDH",
        "type": "power_in",
        "description": "Analog ground."
      },
      {
        "number": "65",
        "name": "P_GND",
        "type": "power_in",
        "description": "Exposed paddle on bottom of chip; connect to ground."
      }
    ],
    "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: The exposed paddle is not given a numeric pin number in the datasheet; it is listed as PADDLE / P_GN; The Pin Configuration figure on page 8 (64-Pin QFN top view) has no text in the extract, so physical; Multiplexed pins (LED2/PHYAD1, LED1/PHYAD0, RXD3-RXD0/MODE, RX_DV/CLK125_EN, RX_CLK/PHYAD2, CLK125_N",
          "exposed pad 65 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint",
          "1/65 pin names appear NOWHERE in the datasheet text: ['60:XO@p13']"
        ],
        "pages_sent": 24,
        "cost_usd": 0.1273,
        "at": "2026-10-18T18:17:44"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883941881761792",
        "pages": 53,
        "sha256": "2bb1c5d71e42069d",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 65,
        "described": 65,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ksz9021gn.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          8.0,
          8.0,
          0.87
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "553641350988a3d949874ef3cbbe3efa6e239859177963f45ba4e900f4c74ccf",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ksz9021gn-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          8.0,
          0.87
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "6029a245fd75fb57309c12fccb2b7de2eb7e38041c146e280cceb7684e0b7fc0",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}