KSZ8081RNBCA-TR

{
  "slug": "ksz8081rnbca-tr",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Ethernet ICs, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface ics",
    "ksz8081rnbca-tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ksz8081rnbca-tr.kicad_sym",
    "ksz8081rnbca-tr.kicad_mod",
    "ksz8081rnbca-tr.glb",
    "ksz8081rnbca-tr.step",
    "ksz8081rnbca-tr.lbr",
    "docs/hero.png",
    "docs/ksz8081rnbca-tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ksz8081rnbca-tr-hero.glb",
    "ksz8081rnbca-tr-hero.overlay.json",
    "ksz8081rnbca-tr-etched.glb"
  ],
  "component": {
    "mpn": "KSZ8081RNBCA-TR",
    "manufacturer": "Microchip Tech",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Interface ICs",
    "subcategory": "Ethernet ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/5a41bfca447a4e13b0fff961d85fcf4f.pdf",
    "parts": {
      "symbol": "ksz8081rnbca-tr.kicad_sym",
      "footprint": "ksz8081rnbca-tr.kicad_mod",
      "model_3d": "ksz8081rnbca-tr-hero.glb",
      "model_3d_plain": "ksz8081rnbca-tr-etched.glb",
      "model_3d_step": "ksz8081rnbca-tr-etched.step",
      "model_3d_step_plain": "ksz8081rnbca-tr.step",
      "lbr": "ksz8081rnbca-tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C89763"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T19:33:06Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "2",
        "name": "VDD_1.2",
        "type": "power_out",
        "description": "1.2V core VDD supplied by the KSZ8081RNB internal regulator; decouple with 2.2 µF and 0.1 µF capacitors to ground."
      },
      {
        "number": "3",
        "name": "VDDA_3.3",
        "type": "power_in",
        "description": "3.3V analog VDD; connect to the board 3.3V supply through a ferrite bead and decouple with 22 µF and 0.1 µF to ground."
      },
      {
        "number": "4",
        "name": "RXM",
        "type": "bidirectional",
        "description": "Physical receive or transmit signal (- differential)."
      },
      {
        "number": "5",
        "name": "RXP",
        "type": "bidirectional",
        "description": "Physical receive or transmit signal (+ differential)."
      },
      {
        "number": "6",
        "name": "TXM",
        "type": "bidirectional",
        "description": "Physical transmit or receive signal (- differential)."
      },
      {
        "number": "7",
        "name": "TXP",
        "type": "bidirectional",
        "description": "Physical transmit or receive signal (+ differential)."
      },
      {
        "number": "8",
        "name": "XO",
        "type": "output",
        "description": "Crystal feedback for the 25 MHz crystal; no connect if an oscillator or external clock source is used."
      },
      {
        "number": "9",
        "name": "XI",
        "type": "input",
        "description": "25 MHz mode: 25 MHz ±50 ppm crystal/oscillator/external clock input; 50 MHz mode: 50 MHz ±50 ppm oscillator/external clock input."
      },
      {
        "number": "10",
        "name": "REXT",
        "type": "input",
        "description": "Sets the PHY transmit output current; connect a 6.49 kΩ resistor to ground."
      },
      {
        "number": "11",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "Management interface data I/O with weak pull-up, open-drain, requiring an external 1.0 kΩ pull-up resistor."
      },
      {
        "number": "12",
        "name": "MDC",
        "type": "input",
        "description": "Management interface clock input with internal pull-up, synchronous to the MDIO data pin."
      },
      {
        "number": "13",
        "name": "PHYAD0",
        "type": "bidirectional",
        "description": "Pull-up/pull-down value is latched as PHYADDR[0] at de-assertion of reset (internal pull-up during reset, output otherwise)."
      },
      {
        "number": "14",
        "name": "PHYAD1",
        "type": "bidirectional",
        "description": "Pull-up/pull-down value is latched as PHYADDR[1] at de-assertion of reset (internal pull-down during reset, output otherwise)."
      },
      {
        "number": "15",
        "name": "RXD1/PHYAD2",
        "type": "bidirectional",
        "description": "RMII receive data output [1]; latched as PHYADDR[2] at de-assertion of reset (internal pull-down during reset)."
      },
      {
        "number": "16",
        "name": "RXD0/DUPLEX",
        "type": "bidirectional",
        "description": "RMII receive data output [0]; latched as DUPLEX at de-assertion of reset (internal pull-up during reset)."
      },
      {
        "number": "17",
        "name": "VDDIO",
        "type": "power_in",
        "description": "3.3V, 2.5V, or 1.8V digital VDD; decouple with 22 µF and 0.1 µF to ground."
      },
      {
        "number": "18",
        "name": "CRS_DV/CONFIG2",
        "type": "bidirectional",
        "description": "RMII carrier sense/receive data valid output; latched as CONFIG2 at de-assertion of reset (internal pull-down during reset)."
      },
      {
        "number": "19",
        "name": "REF_CLK/B-CAST_OFF",
        "type": "bidirectional",
        "description": "In 25 MHz mode outputs the 50 MHz RMII reference clock to the MAC (no connect in 50 MHz mode); latched as B-CAST_OFF at de-assertion of reset."
      },
      {
        "number": "20",
        "name": "RXER/ISO",
        "type": "bidirectional",
        "description": "RMII receive error output; latched as ISOLATE at de-assertion of reset (internal pull-down during reset)."
      },
      {
        "number": "21",
        "name": "INTRP/NAND_TREE#",
        "type": "bidirectional",
        "description": "Programmable open-drain interrupt output with weak pull-up requiring an external 1.0 kΩ pull-up; latched as NAND Tree# at de-assertion of reset."
      },
      {
        "number": "22",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; pin is not bonded and can be left floating."
      },
      {
        "number": "23",
        "name": "TXEN",
        "type": "input",
        "description": "RMII transmit enable input."
      },
      {
        "number": "24",
        "name": "TXD0",
        "type": "input",
        "description": "RMII transmit data input [0], synchronous with the 50 MHz RMII reference clock."
      },
      {
        "number": "25",
        "name": "TXD1",
        "type": "input",
        "description": "RMII transmit data input [1], synchronous with the 50 MHz RMII reference clock; also the NAND tree output."
      },
      {
        "number": "26",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; pin is not bonded and can be left floating."
      },
      {
        "number": "27",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; pin is not bonded and can be left floating."
      },
      {
        "number": "28",
        "name": "CONFIG0",
        "type": "bidirectional",
        "description": "Pull-up/pull-down value is latched as CONFIG0 at de-assertion of reset (internal pull-down during reset)."
      },
      {
        "number": "29",
        "name": "CONFIG1",
        "type": "bidirectional",
        "description": "Pull-up/pull-down value is latched as CONFIG1 at de-assertion of reset (internal pull-down during reset)."
      },
      {
        "number": "30",
        "name": "LED0/NWAYEN",
        "type": "bidirectional",
        "description": "Programmable LED0 output (Register 1Fh bits [5:4]); latched as auto-negotiation enable at de-assertion of reset."
      },
      {
        "number": "31",
        "name": "LED1/SPEED",
        "type": "bidirectional",
        "description": "Programmable LED1 output (Register 1Fh bits [5:4]); latched as speed select (pull-up 100 Mbps, pull-down 10 Mbps) at de-assertion of reset."
      },
      {
        "number": "32",
        "name": "RST#",
        "type": "input",
        "description": "Chip reset, active low, with internal pull-up."
      },
      {
        "number": "33",
        "name": "PADDLE",
        "type": "power_in",
        "description": "Exposed paddle on the bottom of the package; ground."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet labels the exposed pad 'PADDLE' with no pin number; '33' is an assigned placeholder.; The part is RMII (KSZ8081RNB), so Table 2-3 was used. Pin types were mapped from the datasheet buffe; Pin 2 VDD_1.2 is supplied by the on-chip regulator, so it is classed as power_out.",
          "2/33 pins cited to the wrong page (name found elsewhere): ['8:XO@p10', '33:PADDLE@p12']"
        ],
        "pages_sent": 27,
        "cost_usd": 0.1637,
        "at": "2026-10-22T19:32:54"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/5a41bfca447a4e13b0fff961d85fcf4f.pdf",
        "pages": 66,
        "sha256": "773e44836a09f168",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ksz8081rnbca-tr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ksz8081rnbca-tr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "f8339d805651da9d74bc7f88e1e9316082799ed44ce64005e4d01226edde5a87",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}