KSZ8081RNACA-TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "ksz8081rnaca-tr",
  "title": "KSZ8081RNACA-TR",
  "brief": "Microchip Ethernet Controllers, QFN-24-EP(4x4). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ksz8081rnaca-tr"
  ],
  "component": {
    "mpn": "KSZ8081RNACA-TR",
    "manufacturer": "Microchip",
    "package": "QFN-24-EP(4x4)",
    "pin_count": 25,
    "category": "Interface",
    "subcategory": "Ethernet Controllers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/86df1a99f29d4713969e50242675f4e1.pdf",
    "parts": {
      "symbol": "ksz8081rnaca-tr.kicad_sym",
      "footprint": "ksz8081rnaca-tr.kicad_mod",
      "model_3d": "ksz8081rnaca-tr-etched.glb",
      "model_3d_plain": "ksz8081rnaca-tr.glb",
      "model_3d_step": "ksz8081rnaca-tr-etched.step",
      "model_3d_step_plain": "ksz8081rnaca-tr.step",
      "lbr": "ksz8081rnaca-tr.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VDD_1.2",
        "type": "power_in",
        "description": "1.2V core VDD supplied by the on-chip regulator. Decouple with 2.2 uF and 0.1 uF capacitors to ground."
      },
      {
        "number": "2",
        "name": "VDDA_3.3",
        "type": "power_in",
        "description": "3.3V analog VDD supply."
      },
      {
        "number": "3",
        "name": "RXM",
        "type": "bidirectional",
        "description": "Physical Receive or Transmit Signal (negative differential). Media-side MDI/MDI-X pair, on-chip terminated."
      },
      {
        "number": "4",
        "name": "RXP",
        "type": "bidirectional",
        "description": "Physical Receive or Transmit Signal (positive differential). Media-side MDI/MDI-X pair, on-chip terminated."
      },
      {
        "number": "5",
        "name": "TXM",
        "type": "bidirectional",
        "description": "Physical Transmit or Receive Signal (negative differential). Media-side MDI/MDI-X pair, on-chip terminated."
      },
      {
        "number": "6",
        "name": "TXP",
        "type": "bidirectional",
        "description": "Physical Transmit or Receive Signal (positive differential). Media-side MDI/MDI-X pair, on-chip terminated."
      },
      {
        "number": "7",
        "name": "XO",
        "type": "output",
        "description": "Crystal feedback for 25 MHz crystal. Leave as a no-connect if an oscillator or external clock source is used on XI."
      },
      {
        "number": "8",
        "name": "XI",
        "type": "input",
        "description": "25 MHz +/-50 ppm crystal/oscillator/external clock input (RMII 25 MHz mode). KSZ8081RNA power-up default: 25 MHz crystal on this pin. Programmable to 50 MHz mode via PHY Register 1Fh bit [7]."
      },
      {
        "number": "9",
        "name": "REXT",
        "type": "input",
        "description": "PHY transmit output current setting. Connect a 6.49 kOhm 1% resistor from this pin to ground."
      },
      {
        "number": "10",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "Management Interface (MII) data I/O. Open-drain with weak internal pull-up; requires an external 1.0 kOhm pull-up resistor."
      },
      {
        "number": "11",
        "name": "MDC",
        "type": "input",
        "description": "Management Interface (MII) clock input, synchronous to MDIO. Weak internal pull-up."
      },
      {
        "number": "12",
        "name": "RXD1",
        "type": "output",
        "description": "RMII Receive Data Output[1]. Synchronous to the 50 MHz RMII reference clock; two bits sent per clock while CRS_DV is asserted. Internal pull-down active at reset."
      },
      {
        "number": "13",
        "name": "RXD0",
        "type": "output",
        "description": "RMII Receive Data Output[0]. Synchronous to the 50 MHz RMII reference clock; two bits sent per clock while CRS_DV is asserted. Internal pull-up active at reset."
      },
      {
        "number": "14",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply. Selectable 3.3V, 2.5V, or 1.8V."
      },
      {
        "number": "15",
        "name": "CRS_DV/PHYAD[1:0]",
        "type": "bidirectional",
        "description": "RMII mode: Carrier Sense / Receive Data Valid output to the MAC. Config mode: the pull-up/pull-down value on this pin is latched as PHYAD[1:0] at de-assertion of reset (pull-up = 0x3, pull-down default = 0x0)."
      },
      {
        "number": "16",
        "name": "REF_CLK",
        "type": "bidirectional",
        "description": "RMII 25 MHz mode (RNA default): outputs the 50 MHz RMII reference clock to the MAC. RMII 50 MHz mode: no-connect. Latched pull-down active at reset."
      },
      {
        "number": "17",
        "name": "RXER",
        "type": "output",
        "description": "RMII Receive Error output. Needs a latched pull-down at de-assertion of reset for normal operation; add an external pull-down if the MAC drives this pin high."
      },
      {
        "number": "18",
        "name": "INTRP",
        "type": "output",
        "description": "Programmable interrupt output. Open-drain with weak internal pull-up; requires an external 1.0 kOhm pull-up resistor."
      },
      {
        "number": "19",
        "name": "TXEN",
        "type": "input",
        "description": "RMII Transmit Enable input from the MAC."
      },
      {
        "number": "20",
        "name": "TXD0",
        "type": "input",
        "description": "RMII Transmit Data Input[0] from the MAC. Synchronous to the 50 MHz RMII reference clock while TXEN is asserted."
      },
      {
        "number": "21",
        "name": "TXD1",
        "type": "bidirectional",
        "description": "RMII Transmit Data Input[1] from the MAC. NAND Tree mode: acts as the NAND tree output pin."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "23",
        "name": "LED0/ANEN_SPEED",
        "type": "bidirectional",
        "description": "Programmable LED0 output (Link/Activity by default; modes selected via Register 1Fh bits [5:4]). Config mode: latched at de-assertion of reset as auto-negotiation enable (pull-up default = enabled) and speed select (pull-up = 100 Mbps, pull-down = 10 Mbps)."
      },
      {
        "number": "24",
        "name": "RST#",
        "type": "input",
        "description": "Chip reset, active-low. Weak internal pull-up."
      },
      {
        "number": "25",
        "name": "PADDLE_GND",
        "type": "power_in",
        "description": "Exposed paddle on the bottom of the QFN package. Must be soldered to the board ground plane."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/86df1a99f29d4713969e50242675f4e1.pdf",
        "pages": 52,
        "sha256": "6d02bb0e0b96569f",
        "source_tier": "mfr"
      },
      "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"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip",
      "Package": "QFN-24-EP(4x4)",
      "Category": "Interface",
      "Pins": "25"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ksz8081rnaca-tr"
  ],
  "discovery_pitch": "KSZ8081RNACA-TR (Microchip) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ksz8081rnaca-tr.kicad_sym",
    "ksz8081rnaca-tr.kicad_mod",
    "ksz8081rnaca-tr.glb",
    "ksz8081rnaca-tr.step",
    "ksz8081rnaca-tr.lbr",
    "docs/hero.png",
    "docs/ksz8081rnaca-tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ksz8081rnaca-tr-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "KSZ8081RNACA-TR",
      "kind": "packaging"
    },
    {
      "mpn": "KSZ8081RNDCA-TR",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T23:24:52.826Z"
}