YT8531DH-CA

{
  "schema_version": 1,
  "type": "component",
  "slug": "yt8531dh-ca",
  "title": "YT8531DH-CA",
  "brief": "Motorcomm Ethernet Transceivers, QFN-40(5x5). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "yt8531dh-ca"
  ],
  "component": {
    "mpn": "YT8531DH-CA",
    "manufacturer": "Motorcomm",
    "package": "QFN-40(5x5)",
    "pin_count": 41,
    "category": "Interface",
    "subcategory": "Ethernet Transceivers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/9ce30b61c1d565a37e1fc25cfd944151.pdf",
    "parts": {
      "symbol": "yt8531dh-ca.kicad_sym",
      "footprint": "yt8531dh-ca.kicad_mod",
      "model_3d": "yt8531dh-ca-etched.glb",
      "model_3d_plain": "yt8531dh-ca.glb",
      "model_3d_step": "yt8531dh-ca-etched.step",
      "model_3d_step_plain": "yt8531dh-ca.step",
      "lbr": "yt8531dh-ca.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "TRXP0",
        "type": "bidirectional",
        "description": "Media-dependent interface 0 positive; 100Ω differential MDI transmission line to magnetics/RJ45."
      },
      {
        "number": "2",
        "name": "TRXN0",
        "type": "bidirectional",
        "description": "Media-dependent interface 0 negative; 100Ω differential MDI transmission line."
      },
      {
        "number": "3",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog core power supply, 1.1V/1.2V. Sourced from internal LDO2 output (LDO_O, pin 30) on YT8531DH."
      },
      {
        "number": "4",
        "name": "TRXP1",
        "type": "bidirectional",
        "description": "Media-dependent interface 1 positive; 100Ω differential MDI transmission line."
      },
      {
        "number": "5",
        "name": "TRXN1",
        "type": "bidirectional",
        "description": "Media-dependent interface 1 negative; 100Ω differential MDI transmission line."
      },
      {
        "number": "6",
        "name": "TRXP2",
        "type": "bidirectional",
        "description": "Media-dependent interface 2 positive; 100Ω differential MDI transmission line."
      },
      {
        "number": "7",
        "name": "TRXN2",
        "type": "bidirectional",
        "description": "Media-dependent interface 2 negative; 100Ω differential MDI transmission line."
      },
      {
        "number": "8",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog core power supply, 1.1V/1.2V. Second analog core-power pin; tie to same rail as pin 3."
      },
      {
        "number": "9",
        "name": "TRXP3",
        "type": "bidirectional",
        "description": "Media-dependent interface 3 positive; 100Ω differential MDI transmission line."
      },
      {
        "number": "10",
        "name": "TRXN3",
        "type": "bidirectional",
        "description": "Media-dependent interface 3 negative; 100Ω differential MDI transmission line."
      },
      {
        "number": "11",
        "name": "AVDD33",
        "type": "power_in",
        "description": "Analog 3.3V power supply for the PHY analog front end."
      },
      {
        "number": "12",
        "name": "RESET_N",
        "type": "input",
        "description": "Hardware reset, active low. Requires an external pull-up resistor (internal pull-up also present)."
      },
      {
        "number": "13",
        "name": "MDC",
        "type": "input",
        "description": "Management Data Clock (SMI/MDIO interface). Internal pull-down."
      },
      {
        "number": "14",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "Management data input/output (SMI). Internal pull-up. Must be pulled up to 3.3V/2.5V/1.8V matching the RGMII I/O voltage."
      },
      {
        "number": "15",
        "name": "TXD3",
        "type": "input",
        "description": "RGMII transmit data bit 3 (MAC→PHY on TXD[3:0]). Internal pull-down."
      },
      {
        "number": "16",
        "name": "TXD2",
        "type": "input",
        "description": "RGMII transmit data bit 2 (MAC→PHY on TXD[3:0]). Internal pull-down."
      },
      {
        "number": "17",
        "name": "TXD1",
        "type": "input",
        "description": "RGMII transmit data bit 1 (MAC→PHY on TXD[3:0]). Internal pull-down."
      },
      {
        "number": "18",
        "name": "TXD0",
        "type": "input",
        "description": "RGMII transmit data bit 0 (MAC→PHY on TXD[3:0]). Internal pull-down."
      },
      {
        "number": "19",
        "name": "TX_CTL",
        "type": "input",
        "description": "RGMII transmit control signal from the MAC. Internal pull-down."
      },
      {
        "number": "20",
        "name": "TX_CLK",
        "type": "input",
        "description": "RGMII transmit reference clock from MAC. 125 MHz / 25 MHz / 2.5 MHz depending on link speed. Internal pull-down."
      },
      {
        "number": "21",
        "name": "DVDDL",
        "type": "power_in",
        "description": "Digital core power supply, 1.1V/1.2V. Fed from internal LDO2 output (pin 30) on YT8531DH."
      },
      {
        "number": "22",
        "name": "RXD3/PHYAD0",
        "type": "output",
        "description": "RGMII receive data bit 3 (PHY→MAC on RXD[3:0]). At power-up latched as PHYAD[0] of the SMI PHY address. Internal pull-down."
      },
      {
        "number": "23",
        "name": "RXD2/PLLOFF",
        "type": "output",
        "description": "RGMII receive data bit 2. Latched at power-up to configure PLL-off behavior in sleep mode. Internal pull-down."
      },
      {
        "number": "24",
        "name": "RXD1/TXDLY",
        "type": "output",
        "description": "RGMII receive data bit 1. Latched at power-up: pull-up adds delay to TXC for TXD latching (RGMII TX clock timing). Internal pull-down."
      },
      {
        "number": "25",
        "name": "RXD0/RXDLY",
        "type": "output",
        "description": "RGMII receive data bit 0. Latched at power-up: controls RGMII receive clock timing (adds 2 ns delay when RX_CLK=125MHz, 8 ns when RX_CLK=25/2.5MHz). Internal pull-up."
      },
      {
        "number": "26",
        "name": "RX_CTL/PHYAD2",
        "type": "output",
        "description": "RGMII receive control signal to the MAC. Latched at power-up as PHYAD[2]. Internal pull-down."
      },
      {
        "number": "27",
        "name": "RX_CLK/PHYAD1",
        "type": "output",
        "description": "RGMII continuous receive reference clock (125/25/2.5 MHz derived from received data). Latched at power-up as PHYAD[1]. Internal pull-down."
      },
      {
        "number": "28",
        "name": "DVDD_RGMII",
        "type": "power_in",
        "description": "Digital RGMII I/O and MDC/MDIO pad power. Voltage set by CFG_EXT and CFG_LDO[1:0]: 3.3V/2.5V/1.8V from external supply, or from the internal LDO (2.5V/1.8V only). A bulk plus decoupling cap is required regardless of source."
      },
      {
        "number": "29",
        "name": "DVDD33",
        "type": "power_in",
        "description": "3.3V digital non-RGMII I/O power supply."
      },
      {
        "number": "30",
        "name": "LDO_O",
        "type": "power_out",
        "description": "Internal LDO output, 1.1V. On YT8531DH/YT8531DC this pin sources the 1.1V/1.2V core rail; connect to AVDDL (pins 3, 8, 38) and DVDDL (pin 21) with appropriate decoupling."
      },
      {
        "number": "31",
        "name": "INT_N/PME_N",
        "type": "output",
        "description": "Open-drain interrupt / power-management event output. Default is INT_N (active-low level-triggered). Selectable to PME_N (Wake-on-LAN magic-packet event) via EXT 0xA00A bit[6]. Must be pulled up to 3.3V/2.5V/1.8V when used, or left floating."
      },
      {
        "number": "32",
        "name": "LED0/CFG_EXT",
        "type": "output",
        "description": "LED0 output (default: link-up at 10 Mbps solid, activity blink). Latched at power-up as CFG_EXT: pull-up = use external I/O pad power; pull-down = use internal LDO. Internal pull-up."
      },
      {
        "number": "33",
        "name": "LED1/CFG_LDO0",
        "type": "output",
        "description": "LED1 output (default: link-up at 100 Mbps solid, activity blink). Latched at power-up as CFG_LDO[0], setting internal LDO output voltage or external I/O voltage selection together with CFG_LDO1. Internal pull-up."
      },
      {
        "number": "34",
        "name": "LED2/CFG_LDO1",
        "type": "output",
        "description": "LED2 output (default: link-up at 1000 Mbps solid, activity blink). Latched at power-up as CFG_LDO[1]. Together with CFG_LDO0: with CFG_EXT low selects internal LDO = 2.5V/1.8V; with CFG_EXT high selects external I/O = 3.3V/2.5V/1.8V. Internal pull-down."
      },
      {
        "number": "35",
        "name": "CLKOUT",
        "type": "output",
        "description": "25 MHz reference clock output derived from the internal PLL. Also used as the UTP recovery receive clock for Sync-E. Leave floating if unused by the MAC."
      },
      {
        "number": "36",
        "name": "XTAL_I",
        "type": "input",
        "description": "25 MHz crystal input. If driving from an external oscillator/clock on this pin, leave XTAL_O floating. If driving XTAL_O from an external source instead, tie XTAL_I to GND."
      },
      {
        "number": "37",
        "name": "XTAL_O",
        "type": "output",
        "description": "25 MHz crystal output. When driving from an external oscillator/clock on this pin, XTAL_I must be shorted to GND."
      },
      {
        "number": "38",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog core power supply, 1.1V/1.2V. Third AVDDL pin; tie to same rail as pins 3 and 8."
      },
      {
        "number": "39",
        "name": "RBIAS",
        "type": "passive",
        "description": "Bias resistor pin. An external 2.49 kΩ ±1% resistor must be connected between RBIAS and GND to set the internal bias current."
      },
      {
        "number": "40",
        "name": "AVDD33",
        "type": "power_in",
        "description": "Analog 3.3V power supply (second AVDD33 pin; tie to same rail as pin 11)."
      },
      {
        "number": "41",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal pad on the package underside. Must be soldered to the PCB ground plane for both electrical ground and heat sinking."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/9ce30b61c1d565a37e1fc25cfd944151.pdf",
        "pages": 66,
        "sha256": "57f742224754da8c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 41,
        "described": 41,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Motorcomm",
      "Package": "QFN-40(5x5)",
      "Category": "Interface",
      "Pins": "41"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "yt8531dh-ca"
  ],
  "discovery_pitch": "YT8531DH-CA (Motorcomm) 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",
    "yt8531dh-ca.kicad_sym",
    "yt8531dh-ca.kicad_mod",
    "yt8531dh-ca.glb",
    "yt8531dh-ca.step",
    "yt8531dh-ca.lbr",
    "docs/hero.png",
    "docs/yt8531dh-ca-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "yt8531dh-ca-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "YT8531DH-CA",
      "kind": "packaging"
    },
    {
      "mpn": "YT8531DC-CA",
      "kind": "unknown"
    },
    {
      "mpn": "YT8531H-CA",
      "kind": "unknown"
    },
    {
      "mpn": "YT8531C-CA",
      "kind": "unknown"
    },
    {
      "mpn": "YT8531P-CA",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-25T14:44:49.092Z"
}