YT8531H-CA

{
  "schema_version": 1,
  "type": "component",
  "slug": "yt8531h-ca",
  "title": "YT8531H-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",
    "yt8531h-ca"
  ],
  "component": {
    "mpn": "YT8531H-CA",
    "manufacturer": "Motorcomm",
    "package": "QFN-40(5x5)",
    "pin_count": 41,
    "category": "Interface",
    "subcategory": "Ethernet Transceivers",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2404010946_Motorcomm-YT8531H-CA_C22373778.pdf",
    "parts": {
      "symbol": "yt8531h-ca.kicad_sym",
      "footprint": "yt8531h-ca.kicad_mod",
      "model_3d": "yt8531h-ca-etched.glb",
      "model_3d_plain": "yt8531h-ca.glb",
      "model_3d_step": "yt8531h-ca-etched.step",
      "model_3d_step_plain": "yt8531h-ca.step",
      "lbr": "yt8531h-ca.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "TRXP0",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 0, positive. 100Ω differential transmission line for MDI pair A."
      },
      {
        "number": "2",
        "name": "TRXN0",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 0, negative. 100Ω differential transmission line for MDI pair A."
      },
      {
        "number": "3",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog power supply, 1.1V/1.2V. Bypass locally with a decoupling capacitor."
      },
      {
        "number": "4",
        "name": "TRXP1",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 1, positive. 100Ω differential transmission line for MDI pair B."
      },
      {
        "number": "5",
        "name": "TRXN1",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 1, negative. 100Ω differential transmission line for MDI pair B."
      },
      {
        "number": "6",
        "name": "TRXP2",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 2, positive. 100Ω differential transmission line for MDI pair C."
      },
      {
        "number": "7",
        "name": "TRXN2",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 2, negative. 100Ω differential transmission line for MDI pair C."
      },
      {
        "number": "8",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog power supply, 1.1V/1.2V. Bypass locally with a decoupling capacitor."
      },
      {
        "number": "9",
        "name": "TRXP3",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 3, positive. 100Ω differential transmission line for MDI pair D."
      },
      {
        "number": "10",
        "name": "TRXN3",
        "type": "bidirectional",
        "description": "Media-dependent interface pair 3, negative. 100Ω differential transmission line for MDI pair D."
      },
      {
        "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."
      },
      {
        "number": "13",
        "name": "MDC",
        "type": "input",
        "description": "MDIO Management Data Clock input from MAC. Internal pull-down."
      },
      {
        "number": "14",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "MDIO Management Data I/O. Bidirectional; pull up to 3.3V/2.5V/1.8V matching I/O voltage. Internal pull-up."
      },
      {
        "number": "15",
        "name": "TXD3",
        "type": "input",
        "description": "RGMII transmit data bit 3 from MAC to PHY. Internal pull-down."
      },
      {
        "number": "16",
        "name": "TXD2",
        "type": "input",
        "description": "RGMII transmit data bit 2 from MAC to PHY. Internal pull-down."
      },
      {
        "number": "17",
        "name": "TXD1",
        "type": "input",
        "description": "RGMII transmit data bit 1 from MAC to PHY. Internal pull-down."
      },
      {
        "number": "18",
        "name": "TXD0",
        "type": "input",
        "description": "RGMII transmit data bit 0 from MAC to PHY. 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 (125/25/2.5 MHz depending on speed). Internal pull-down."
      },
      {
        "number": "21",
        "name": "DVDDL",
        "type": "power_in",
        "description": "Digital core power supply, 1.1V/1.2V."
      },
      {
        "number": "22",
        "name": "RXD3/PHYAD0",
        "type": "output",
        "description": "RGMII receive data bit 3 output to MAC. Latched at power-up as PHY address bit 0 (PHYAD0); internal pull-down default sets bit low."
      },
      {
        "number": "23",
        "name": "RXD2/PLLOFF",
        "type": "output",
        "description": "RGMII receive data bit 2 output. Latched at power-up as PLLOFF strap (sleep-mode PLL off configuration). Internal pull-down."
      },
      {
        "number": "24",
        "name": "RXD1/TXDLY",
        "type": "output",
        "description": "RGMII receive data bit 1 output. Latched at power-up as TXDLY strap; pull-up adds RGMII TXC delay for TXD latching. Internal pull-down."
      },
      {
        "number": "25",
        "name": "RXD0/RXDLY",
        "type": "output",
        "description": "RGMII receive data bit 0 output. Latched at power-up as RXDLY strap; pull-up adds 2ns delay on RX_CLK at 125MHz or 8ns at 25/2.5MHz. Internal pull-up."
      },
      {
        "number": "26",
        "name": "RX_CTL/PHYAD2",
        "type": "output",
        "description": "RGMII receive control signal to MAC. Latched at power-up as PHY address bit 2 (PHYAD2). 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 PHY address bit 1 (PHYAD1). Internal pull-down."
      },
      {
        "number": "28",
        "name": "DVDD_RGMII",
        "type": "power_in",
        "description": "Digital I/O supply for RGMII, MDC, and MDIO pads. Voltage set by CFG_EXT and CFG_LDO[1:0]; supplied externally or from internal LDO. Requires bulk plus decoupling capacitor regardless of source."
      },
      {
        "number": "29",
        "name": "DVDD33",
        "type": "power_in",
        "description": "3.3V digital supply for non-RGMII I/O pads."
      },
      {
        "number": "30",
        "name": "REG_O",
        "type": "power_out",
        "description": "Internal switch-mode regulator 1.1V output for the YT8531H variant. Connect directly to an external 2.2 uH power inductor. (This pin is LDO_O on YT8531DH/DC and NC on YT8531P.)"
      },
      {
        "number": "31",
        "name": "INT_N/PME_N",
        "type": "output",
        "description": "Open-drain interrupt output (default INT_N, active low). Optionally reassigned as PME_N (Power Management Event, active low on magic-packet reception) via EXT 0xA00A bit[6]. Requires 3.3V external pull-up; leave floating if unused."
      },
      {
        "number": "32",
        "name": "LED0/CFG_EXT",
        "type": "output",
        "description": "LED0 driver (light = 10 Mbps link up, blink = TX/RX activity). Latched at power-up as CFG_EXT strap selecting I/O pad power source (pull-up = external, pull-down = internal LDO). Internal pull-up."
      },
      {
        "number": "33",
        "name": "LED1/CFG_LDO0",
        "type": "output",
        "description": "LED1 driver (light = 100 Mbps link up, blink = TX/RX activity). Latched at power-up as CFG_LDO0, sets I/O pad LDO output voltage or external input voltage together with CFG_LDO1. Internal pull-up."
      },
      {
        "number": "34",
        "name": "LED2/CFG_LDO1",
        "type": "output",
        "description": "LED2 driver (light = 1000 Mbps link up, blink = TX/RX activity). Latched at power-up as CFG_LDO1, sets I/O pad LDO output voltage or external input voltage together with CFG_LDO0. Internal pull-down."
      },
      {
        "number": "35",
        "name": "CLKOUT",
        "type": "output",
        "description": "Reference clock output from internal PLL: 25 MHz reference clock or UTP-recovery receive clock for Synchronous Ethernet. Leave floating if unused by the MAC."
      },
      {
        "number": "36",
        "name": "XTAL_I",
        "type": "input",
        "description": "25 MHz crystal input pin. When using an external clock/oscillator driven into XTAL_O, short XTAL_I to GND; when driving a clock into XTAL_I, leave XTAL_O floating."
      },
      {
        "number": "37",
        "name": "XTAL_O",
        "type": "output",
        "description": "25 MHz crystal output pin. When using an external clock into XTAL_I, leave XTAL_O floating; when driving external source into XTAL_O, short XTAL_I to GND."
      },
      {
        "number": "38",
        "name": "AVDDL",
        "type": "power_in",
        "description": "Analog power supply, 1.1V/1.2V. Bypass locally with a decoupling capacitor."
      },
      {
        "number": "39",
        "name": "RBIAS",
        "type": "passive",
        "description": "Bias current reference. Requires an external 2.49 kΩ ±1% resistor to GND."
      },
      {
        "number": "40",
        "name": "AVDD33",
        "type": "power_in",
        "description": "Analog 3.3V power supply for the PHY analog front end."
      },
      {
        "number": "41",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal/ground pad on the QFN underside. Must be soldered to the PCB ground plane for both electrical ground and thermal dissipation."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2404010946_Motorcomm-YT8531H-CA_C22373778.pdf",
        "pages": 66,
        "sha256": "fa0145e682bbdfad",
        "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"
    },
    "models_3d": [
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        "file": "yt8531h-ca.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "8f37bc7a9aab4742c34f137d9822c0352acc227532830034555744338483cdfc",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "yt8531h-ca-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "5dde44b24109cf9d33a6ed2cc68dad6d4c86f64dac1e4d8b66c7ac56c51456ba",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Motorcomm",
      "Package": "QFN-40(5x5)",
      "Category": "Interface",
      "Pins": "41"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "yt8531h-ca"
  ],
  "discovery_pitch": "YT8531H-CA (Motorcomm) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "yt8531h-ca.kicad_mod",
    "yt8531h-ca.glb",
    "yt8531h-ca.step",
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    "docs/yt8531h-ca-datasheet.pdf",
    "viewers/symbol.html",
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  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "YT8531H-CA",
      "kind": "packaging"
    },
    {
      "mpn": "YT8531C-CA",
      "kind": "unknown"
    },
    {
      "mpn": "YT8531DH-CA",
      "kind": "unknown"
    },
    {
      "mpn": "YT8531DC-CA",
      "kind": "unknown"
    },
    {
      "mpn": "YT8531P-CA",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-25T14:44:57.321Z"
}