YT8531SC

{
  "schema_version": 1,
  "type": "component",
  "slug": "yt8531sc",
  "title": "YT8531SC",
  "brief": "Motorcomm Ethernet ICs, QFN-48(6x6). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "communication interface chip-uart-485-232",
    "yt8531sc",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "YT8531SC",
    "manufacturer": "Motorcomm",
    "package": "QFN-48(6x6)",
    "pin_count": 49,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "Ethernet ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b92bdd2442f8d056c0ab955e630f8db0.pdf",
    "parts": {
      "symbol": "yt8531sc.kicad_sym",
      "footprint": "yt8531sc.kicad_mod",
      "model_3d": "yt8531sc-hero.glb",
      "model_3d_plain": "yt8531sc-etched.glb",
      "model_3d_step": "yt8531sc-etched.step",
      "model_3d_step_plain": "yt8531sc.step",
      "lbr": "yt8531sc.lbr"
    },
    "distributor_links": {
      "lcsc": "C5279059"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T21:24:46Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "AVDD33",
        "type": "power_in",
        "description": "Analog 3.3V power supply."
      },
      {
        "number": "2",
        "name": "TRXP0",
        "type": "bidirectional",
        "description": "Media-dependent interface 0 positive, 100Ω transmission line."
      },
      {
        "number": "3",
        "name": "TRXN0",
        "type": "bidirectional",
        "description": "Media-dependent interface 0 negative, 100Ω transmission line."
      },
      {
        "number": "4",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog 1.1V power supply."
      },
      {
        "number": "5",
        "name": "TRXP1",
        "type": "bidirectional",
        "description": "Media-dependent interface 1 positive, 100Ω transmission line."
      },
      {
        "number": "6",
        "name": "TRXN1",
        "type": "bidirectional",
        "description": "Media-dependent interface 1 negative, 100Ω transmission line."
      },
      {
        "number": "7",
        "name": "TRXP2",
        "type": "bidirectional",
        "description": "Media-dependent interface 2 positive, 100Ω transmission line."
      },
      {
        "number": "8",
        "name": "TRXN2",
        "type": "bidirectional",
        "description": "Media-dependent interface 2 negative, 100Ω transmission line."
      },
      {
        "number": "9",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog 1.1V power supply."
      },
      {
        "number": "10",
        "name": "TRXP3",
        "type": "bidirectional",
        "description": "Media-dependent interface 3 positive, 100Ω transmission line."
      },
      {
        "number": "11",
        "name": "TRXN3",
        "type": "bidirectional",
        "description": "Media-dependent interface 3 negative, 100Ω transmission line."
      },
      {
        "number": "12",
        "name": "AVDD33",
        "type": "power_in",
        "description": "Analog 3.3V power supply."
      },
      {
        "number": "13",
        "name": "RESET_N",
        "type": "input",
        "description": "Hardware reset, active low, internal pull-up; requires an external pull-up resistor."
      },
      {
        "number": "14",
        "name": "MDC",
        "type": "input",
        "description": "Management Data Clock, internal pull-down."
      },
      {
        "number": "15",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "Management data input/output, internal pull-up; pull up to 3.3V/2.5V/1.8V for the respective I/O voltage."
      },
      {
        "number": "16",
        "name": "TXD3",
        "type": "input",
        "description": "RGMII transmit data bit 3 from MAC to PHY, internal pull-down."
      },
      {
        "number": "17",
        "name": "TXD2",
        "type": "input",
        "description": "RGMII transmit data bit 2 from MAC to PHY, internal pull-down."
      },
      {
        "number": "18",
        "name": "TXD1",
        "type": "input",
        "description": "RGMII transmit data bit 1 from MAC to PHY, internal pull-down."
      },
      {
        "number": "19",
        "name": "TXD0",
        "type": "input",
        "description": "RGMII transmit data bit 0 from MAC to PHY, internal pull-down."
      },
      {
        "number": "20",
        "name": "TX_CTL",
        "type": "input",
        "description": "RGMII transmit control signal from the MAC, internal pull-down."
      },
      {
        "number": "21",
        "name": "TX_CLK",
        "type": "input",
        "description": "RGMII transmit reference clock, 125MHz, 25MHz, or 2.5MHz depending on speed, internal pull-down."
      },
      {
        "number": "22",
        "name": "DVDDL",
        "type": "power_in",
        "description": "Digital 1.1V power supply."
      },
      {
        "number": "23",
        "name": "RXD3/CFG_MODE2",
        "type": "bidirectional",
        "description": "RGMII receive data bit 3 to MAC; latched at power-up as CFG_MODE2 operation mode configuration, internal pull-down."
      },
      {
        "number": "24",
        "name": "RXD2/CFG_MODE1",
        "type": "bidirectional",
        "description": "RGMII receive data bit 2 to MAC; latched at power-up as CFG_MODE1 operation mode configuration, internal pull-down."
      },
      {
        "number": "25",
        "name": "RXD1/CFG_MODE0",
        "type": "bidirectional",
        "description": "RGMII receive data bit 1 to MAC; latched at power-up as CFG_MODE0 operation mode configuration, internal pull-down."
      },
      {
        "number": "26",
        "name": "RXD0/RXDLY",
        "type": "bidirectional",
        "description": "RGMII receive data bit 0 to MAC; latched at power-up as RXDLY, pull-up adds 2ns delay on RX_CLK, internal pull-up."
      },
      {
        "number": "27",
        "name": "RX_CTL/PHYAD2",
        "type": "bidirectional",
        "description": "RGMII receive control signal to MAC; latched at power-up as PHYAD2 PHY address bit, internal pull-down."
      },
      {
        "number": "28",
        "name": "RX_CLK/PHYAD1",
        "type": "bidirectional",
        "description": "RGMII continuous receive clock of 125MHz, 25MHz, or 2.5MHz; latched at power-up as PHYAD1, internal pull-down."
      },
      {
        "number": "29",
        "name": "DVDD_RGMII",
        "type": "power_in",
        "description": "Digital RGMII I/O and MDC/MDIO power set by CFG_LDO[1:0]; external 3.3V when CFG_LDO[1:0]=00, otherwise from internal LDO; needs bulk and decoupling capacitors."
      },
      {
        "number": "30",
        "name": "DVDD33",
        "type": "power_in",
        "description": "3.3V power for digital non-RGMII I/O."
      },
      {
        "number": "31",
        "name": "VDD33_LX",
        "type": "power_in",
        "description": "3.3V power for the switching regulator."
      },
      {
        "number": "32",
        "name": "LX",
        "type": "power_out",
        "description": "Switch regulator 1.1V output; connect directly to an external 2.2uH power inductor."
      },
      {
        "number": "33",
        "name": "Reserved",
        "type": "bidirectional",
        "description": "Reserved for internal use; keep floating or external pull-down, do not pull up."
      },
      {
        "number": "34",
        "name": "INT_N/PME_N",
        "type": "output",
        "description": "Open-drain active-low interrupt (default) or power management event output selected by Ext 0xA00A bit[6]; should be pulled up to 3.3V, keep floating if unused."
      },
      {
        "number": "35",
        "name": "LED0/PHYAD0",
        "type": "bidirectional",
        "description": "LED0 (light = link up at 10Mbps, blinking = transmit/receive); latched at power-up as PHYAD0, internal pull-up."
      },
      {
        "number": "36",
        "name": "LED1/CFG_LDO0",
        "type": "bidirectional",
        "description": "LED1 (light = link up at 100Mbps, blinking = transmit/receive); latched at power-up as CFG_LDO0 RGMII I/O voltage select, internal pull-up."
      },
      {
        "number": "37",
        "name": "LED2/CFG_LDO1",
        "type": "bidirectional",
        "description": "LED2 (light = link up at 1000Mbps, blinking = transmit/receive); latched at power-up as CFG_LDO1 RGMII I/O voltage select, internal pull-down."
      },
      {
        "number": "38",
        "name": "HSIP",
        "type": "input",
        "description": "SerDes differential input positive, 1.25GHz, internal 100 ohm differential termination."
      },
      {
        "number": "39",
        "name": "HSIN",
        "type": "input",
        "description": "SerDes differential input negative, 1.25GHz, internal 100 ohm differential termination."
      },
      {
        "number": "40",
        "name": "HSOP",
        "type": "output",
        "description": "SerDes differential output positive, 1.25GHz, internal 50 ohm termination to AVDDL."
      },
      {
        "number": "41",
        "name": "HSON",
        "type": "output",
        "description": "SerDes differential output negative, 1.25GHz, internal 50 ohm termination to AVDDL."
      },
      {
        "number": "42",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; keep floating or connect to GND."
      },
      {
        "number": "43",
        "name": "Reserved",
        "type": "passive",
        "description": "Reserved; keep floating or connect to GND, must not connect to VDD or be pulled up."
      },
      {
        "number": "44",
        "name": "CLKOUT",
        "type": "output",
        "description": "Reference clock from internal PLL or UTP/fiber recovered receive clock for Sync Ethernet; keep floating if unused by the MAC."
      },
      {
        "number": "45",
        "name": "XTAL_I",
        "type": "passive",
        "description": "25MHz crystal input; shorted to GND when an external oscillator drives XTAL_O, or driven by an external oscillator with XTAL_O floating."
      },
      {
        "number": "46",
        "name": "XTAL_O",
        "type": "passive",
        "description": "25MHz crystal output; can be driven by an external oscillator with XTAL_I shorted to GND, otherwise left floating."
      },
      {
        "number": "47",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog 1.1V power supply."
      },
      {
        "number": "48",
        "name": "RBIAS",
        "type": "output",
        "description": "Bias resistor pin; an external 2.49kΩ ±1% resistor must be connected between RBIAS and GND."
      },
      {
        "number": "49",
        "name": "GND",
        "type": "power_in",
        "description": "Ground, exposed pad."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "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: Pin 49 is the exposed pad (not a numbered leaded pin) listed as pin 49 in Table 1.; XTAL_I/XTAL_O typed as passive because datasheet type 'XT' (crystal) has no direct KiCad class.; Pin 43 is listed as type G (ground) but described as keep floating or connect to GND; typed passive."
        ],
        "pages_sent": 19,
        "cost_usd": 0.2105,
        "at": "2026-10-22T21:23:49"
      },
      "datasheet": {
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        "pages": 75,
        "sha256": "546bbbcc952d079c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 49,
        "described": 49,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Motorcomm",
      "Package": "QFN-48(6x6)",
      "Category": "Communication Interface Chip/UART/485/232",
      "Pins": "49"
    },
    "characteristics": {
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          "name": "Operating temperature",
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        {
          "name": "Reset: time from powers steady to reset release",
          "symbol": "T1",
          "kind": "timing",
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          "name": "Reset: duration of reset signal low",
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        {
          "name": "MDIO to MDC Rising Hold Time (Data Input)",
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        {
          "name": "MDIO Valid from MDC rising edge (Data Output)",
          "symbol": "t6",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": 20,
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        },
        {
          "name": "Crystal reference frequency",
          "symbol": "Fref",
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          "unit": "MHz",
          "min": null,
          "typ": 25,
          "max": null,
          "conditions": "Parallel resonant crystal",
          "source_page": 71,
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        },
        {
          "name": "Crystal frequency tolerance",
          "symbol": "Fref Tolerance",
          "kind": "tolerance",
          "unit": "ppm",
          "min": -50,
          "typ": null,
          "max": 50,
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        },
        {
          "name": "Reference clock input duty cycle (crystal)",
          "symbol": "Fref Duty Cycle",
          "kind": "electrical",
          "unit": "%",
          "min": 40,
          "typ": null,
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        },
        {
          "name": "Crystal ESR",
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        {
          "name": "Crystal drive level",
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          "unit": "mW",
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        {
          "name": "Crystal output high level",
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          "min": 1.4,
          "typ": null,
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        {
          "name": "Crystal output low level",
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        },
        {
          "name": "External clock frequency tolerance",
          "symbol": "",
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          "unit": "PPM",
          "min": -50,
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        {
          "name": "External clock duty cycle",
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        {
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          "unit": "V",
          "min": 1.4,
          "typ": null,
          "max": null,
          "conditions": "Max is AVDD33+0.3 V",
          "source_page": 72,
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        },
        {
          "name": "External clock Vil",
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          "name": "External clock rise time",
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          "name": "External clock fall time",
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          "name": "External clock frequency",
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          "kind": "electrical",
          "unit": "MHz",
          "min": null,
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          "max": null,
          "conditions": "Oscillator/External clock",
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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