DS125BR111RTWT

{
  "slug": "ds125br111rtwt",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Signal Buffers, Repeaters, Splitters, WQFN-24(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "communication interface chip-uart-485-232",
    "ds125br111rtwt",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "ds125br111rtwt.kicad_sym",
    "ds125br111rtwt.kicad_mod",
    "ds125br111rtwt.glb",
    "ds125br111rtwt.step",
    "ds125br111rtwt.lbr",
    "docs/hero.png",
    "docs/ds125br111rtwt-datasheet.pdf",
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    "viewers/footprint.html",
    "ds125br111rtwt-hero.glb",
    "ds125br111rtwt-hero.overlay.json",
    "ds125br111rtwt-etched.glb"
  ],
  "component": {
    "mpn": "DS125BR111RTWT",
    "manufacturer": "Texas Instruments",
    "package": "WQFN-24(4x4)",
    "pin_count": 25,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "Signal Buffers, Repeaters, Splitters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ds125br111",
    "parts": {
      "symbol": "ds125br111rtwt.kicad_sym",
      "footprint": "ds125br111rtwt.kicad_mod",
      "model_3d": "ds125br111rtwt-hero.glb",
      "model_3d_plain": "ds125br111rtwt-etched.glb",
      "model_3d_step": "ds125br111rtwt-etched.step",
      "model_3d_step_plain": "ds125br111rtwt.step",
      "lbr": "ds125br111rtwt.lbr"
    },
    "distributor_links": {
      "lcsc": "C2870212",
      "digikey": "296-48537-2-ND",
      "mouser": "595-DS125BR111RTWT"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T15:58:52Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-48537-2-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-DS125BR111RTWT",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "AD3/EQB0",
        "type": "input",
        "description": "In pin mode this 4-level input sets the channel B equalization level (EQB0), and in SMBus mode it is SMBus slave address input AD3; EQB0 is defined only when ENSMB is low."
      },
      {
        "number": "2",
        "name": "AD2/EQB1",
        "type": "input",
        "description": "In pin mode this input is EQB1, which the datasheet states is not used in this design and should be tied to GND; in SMBus mode it is SMBus slave address input AD2."
      },
      {
        "number": "3",
        "name": "ENSMB",
        "type": "input",
        "description": "4-level input that selects SMBus register access when tied 1 kΩ to VDD, read of external EEPROM when floating, and pin mode when tied 1 kΩ to GND."
      },
      {
        "number": "4",
        "name": "SDA/VODA_DB",
        "type": "bidirectional",
        "description": "SMBus bidirectional open-drain data pin requiring external pull-up of typically 2 kΩ to 5 kΩ and 3.3 V tolerance in SMBus mode; in pin mode it is VODA_DB, which should be held Low for SAS and PCIe applications."
      },
      {
        "number": "5",
        "name": "SCL/VODB_DB",
        "type": "bidirectional",
        "description": "SMBus clock input (slave mode) or open-drain clock output while loading EEPROM (master mode); in pin mode it is VODB_DB, which should be held Low for SAS and PCIe applications."
      },
      {
        "number": "6",
        "name": "PWDN",
        "type": "input",
        "description": "LVCMOS power-down input where tying High selects low power/power down and tying GND selects normal operation."
      },
      {
        "number": "7",
        "name": "OUTA+",
        "type": "output",
        "description": "Non-inverting 50 Ω CML driver output for channel A, compatible with AC-coupled CML inputs and requiring AC coupling."
      },
      {
        "number": "8",
        "name": "OUTA-",
        "type": "output",
        "description": "Inverting 50 Ω CML driver output for channel A, compatible with AC-coupled CML inputs and requiring AC coupling."
      },
      {
        "number": "9",
        "name": "AD1/EQA1",
        "type": "input",
        "description": "In pin mode this input is EQA1, which the datasheet states is not used in this design and should be tied to GND; in SMBus mode it is SMBus slave address input AD1."
      },
      {
        "number": "10",
        "name": "AD0/EQA0",
        "type": "input",
        "description": "In pin mode this 4-level input sets the channel A equalization level (EQA0), and in SMBus mode it is SMBus slave address input AD0; EQA0 is defined only when ENSMB is low."
      },
      {
        "number": "11",
        "name": "INB+",
        "type": "input",
        "description": "Non-inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
      },
      {
        "number": "12",
        "name": "INB-",
        "type": "input",
        "description": "Inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
      },
      {
        "number": "13",
        "name": "RES",
        "type": "unconnected",
        "description": "Reserved pin that the datasheet states must be left floating."
      },
      {
        "number": "14",
        "name": "SD_TH",
        "type": "input",
        "description": "4-level input setting the internal signal detect threshold for system debug only, which does not control the high-speed datapath."
      },
      {
        "number": "15",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply input that must be fed 3.3 V in 3.3 V mode and left floating in 2.5 V mode."
      },
      {
        "number": "16",
        "name": "VDD_SEL",
        "type": "input",
        "description": "Internal regulator control: float selects 2.5 V mode, tie to GND selects 3.3 V mode (enables internal regulator)."
      },
      {
        "number": "17",
        "name": "READEN/VOD_SEL",
        "type": "input",
        "description": "In SMBus slave mode this pin must be tied Low for AD[3:0] to be active (High or float gives address 0xB0); in pin mode it is VOD_SEL, a 4-level input controlling the low-frequency input-to-output voltage amplitude ratio."
      },
      {
        "number": "18",
        "name": "DONE/RXDET",
        "type": "bidirectional",
        "description": "DONE is a valid register load status output (High means EEPROM load failed or incomplete, Low means passed) when ENSMB floats; RXDET in pin mode enables a 50 Ω or >50 kΩ termination to the power rail depending on input level."
      },
      {
        "number": "19",
        "name": "OUTB-",
        "type": "output",
        "description": "Inverting 50 Ω CML driver output for channel B, compatible with AC-coupled CML inputs and requiring AC coupling."
      },
      {
        "number": "20",
        "name": "OUTB+",
        "type": "output",
        "description": "Non-inverting 50 Ω CML driver output for channel B, compatible with AC-coupled CML inputs and requiring AC coupling."
      },
      {
        "number": "21",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply pin for CML/analog circuitry; connect to 2.5 V in 2.5 V mode and decouple to GND with 0.22 µF capacitance in 3.3 V mode."
      },
      {
        "number": "22",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply pin for CML/analog circuitry; connect to 2.5 V in 2.5 V mode and decouple to GND with 0.22 µF capacitance in 3.3 V mode."
      },
      {
        "number": "23",
        "name": "INA-",
        "type": "input",
        "description": "Inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
      },
      {
        "number": "24",
        "name": "INA+",
        "type": "input",
        "description": "Non-inverting CML differential input to the equalizer with an on-chip 50 Ω termination to VDD when enabled by RXDET logic; AC coupling is required."
      },
      {
        "number": "25",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The DAP is the exposed die-attach pad with no numbered pin; it is listed as GND (power_in) with numb; Pins 4, 5, 17 and 18 are multi-function (SMBus/pin-mode and VOD/RXDET/DONE functions depend on ENSMB"
        ],
        "pages_sent": 11,
        "cost_usd": 0.0293,
        "at": "2026-10-28T15:58:38"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ds125br111",
        "pages": 45,
        "sha256": "0b7cee4cabe65671",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 25,
        "described": 25,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "096fc110543e6d324c5120c2d38e3dca87a389da9b6fac234f1fe40856295ef4",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ds125br111rtwt-etched.step",
        "role": "eda",
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        "sha256": "3ae0c173ba73f5f62dff38adcbe4f31cf269031d80e8196b54309f00554e8f24",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  }
}