TPS65981ABIRTQR

{
  "slug": "tps65981abirtqr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Power Distribution Switches, QFN-56-EP(8x8). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power supply chip",
    "tps65981abirtqr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tps65981abirtqr.kicad_sym",
    "tps65981abirtqr.kicad_mod",
    "tps65981abirtqr.glb",
    "tps65981abirtqr.step",
    "tps65981abirtqr.lbr",
    "docs/hero.png",
    "docs/tps65981abirtqr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tps65981abirtqr-hero.glb",
    "tps65981abirtqr-hero.overlay.json"
  ],
  "component": {
    "mpn": "TPS65981ABIRTQR",
    "manufacturer": "Texas Instruments",
    "package": "QFN-56-EP(8x8)",
    "pin_count": 57,
    "category": "Power Supply Chip",
    "subcategory": "Power Distribution Switches",
    "datasheet": "https://www.ti.com/cn/lit/gpn/tps65981",
    "parts": {
      "symbol": "tps65981abirtqr.kicad_sym",
      "footprint": "tps65981abirtqr.kicad_mod",
      "model_3d": "tps65981abirtqr-hero.glb",
      "model_3d_plain": "tps65981abirtqr.glb",
      "model_3d_step": "tps65981abirtqr-etched.step",
      "model_3d_step_plain": "tps65981abirtqr.step",
      "lbr": "tps65981abirtqr.lbr"
    },
    "distributor_links": {
      "lcsc": "C702347",
      "digikey": "296-48206-2-ND",
      "mouser": "595-TPS65981ABIRTQR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T21:41:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-48206-2-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "595-TPS65981ABIRTQR",
        "status": "found",
        "lifecycle": "Not Recommended for New Designs"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GPIO8",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 8; float if configured as push-pull output, otherwise ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "2",
        "name": "DEBUG1",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 15; ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "3",
        "name": "SS",
        "type": "output",
        "description": "Soft start; tie to capacitance CSS to ground (driven low at POR)."
      },
      {
        "number": "4",
        "name": "USB_RP_P",
        "type": "bidirectional",
        "description": "System-side USB2.0 high-speed connection to the port multiplexer; ground with 1-kΩ to 5-MΩ resistance when unused."
      },
      {
        "number": "5",
        "name": "USB_RP_N",
        "type": "bidirectional",
        "description": "System-side USB2.0 high-speed connection to the port multiplexer; ground with 1-kΩ to 5-MΩ resistance when unused."
      },
      {
        "number": "6",
        "name": "C_USB_TP",
        "type": "bidirectional",
        "description": "Port-side top USB D+ connection to the port multiplexer."
      },
      {
        "number": "7",
        "name": "C_USB_TN",
        "type": "bidirectional",
        "description": "Port-side top USB D- connection to the port multiplexer."
      },
      {
        "number": "8",
        "name": "C_USB_BP",
        "type": "bidirectional",
        "description": "Port-side bottom USB D+ connection to the port multiplexer."
      },
      {
        "number": "9",
        "name": "C_USB_BN",
        "type": "bidirectional",
        "description": "Port-side bottom USB D- connection to the port multiplexer."
      },
      {
        "number": "10",
        "name": "C_SBU1",
        "type": "bidirectional",
        "description": "Port-side sideband-use connection of the port multiplexer."
      },
      {
        "number": "11",
        "name": "C_SBU2",
        "type": "bidirectional",
        "description": "Port-side sideband-use connection of the port multiplexer."
      },
      {
        "number": "12",
        "name": "RPD_G1",
        "type": "passive",
        "description": "Tie to C_CC1 when configured to receive power in dead-battery or no-power condition, otherwise tie to GND."
      },
      {
        "number": "13",
        "name": "C_CC1",
        "type": "bidirectional",
        "description": "Output to Type-C CC or VCONN pin; filter noise with capacitance CC_CC1 to GND."
      },
      {
        "number": "14",
        "name": "PP_CABLE",
        "type": "power_in",
        "description": "5-V supply for C_CC pins; bypass with CPP_CABLE to GND when not tied to PP_5V0, tie to PP_5V0 when unused."
      },
      {
        "number": "15",
        "name": "C_CC2",
        "type": "bidirectional",
        "description": "Output to Type-C CC or VCONN pin; filter noise with capacitance CC_CC2 to GND."
      },
      {
        "number": "16",
        "name": "RPD_G2",
        "type": "passive",
        "description": "Tie to C_CC2 when configured to receive power in dead-battery or no-power condition, otherwise tie to GND."
      },
      {
        "number": "17",
        "name": "VBUS",
        "type": "power_in",
        "description": "5-V output from PP_5V0 and input or output from PP_HV up to 20 V; bypass with CVBUS to GND."
      },
      {
        "number": "18",
        "name": "VBUS",
        "type": "power_in",
        "description": "5-V output from PP_5V0 and input or output from PP_HV up to 20 V; bypass with CVBUS to GND."
      },
      {
        "number": "19",
        "name": "GPIO3",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 3; float if configured as push-pull output, otherwise ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "20",
        "name": "GPIO6",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 6; float if configured as push-pull output, otherwise ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "21",
        "name": "RESETZ",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 9; active-low reset output when VIN_3V3 is low (driven low on start-up); float when unused."
      },
      {
        "number": "22",
        "name": "BUSPOWERZ",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 10 sampled by ADC at boot; tie to LDO_3V3 through 100 kΩ to disable PP_HV and PP_EXT paths during dead-battery or no-battery boot."
      },
      {
        "number": "23",
        "name": "GPIO5",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 5; can be an HPD receiver; tie high or low through 1 kΩ when used as a configuration input, otherwise ground with 1 MΩ when unused."
      },
      {
        "number": "24",
        "name": "MRESET",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 11 that forces RESETZ to assert (by default when pulled high); ground with 1 MΩ when unused."
      },
      {
        "number": "25",
        "name": "GPIO2",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 2; float if configured as push-pull output, otherwise ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "26",
        "name": "GPIO4",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 4 configurable as HPD transistor, HPD receiver, or both for DisplayPort; ground with 1 MΩ when unused."
      },
      {
        "number": "27",
        "name": "PP_5V0",
        "type": "power_in",
        "description": "5-V supply for VBUS; bypass with CPP_5V0 to GND, tie to GND when unused."
      },
      {
        "number": "28",
        "name": "PP_5V0",
        "type": "power_in",
        "description": "5-V supply for VBUS; bypass with CPP_5V0 to GND, tie to GND when unused."
      },
      {
        "number": "29",
        "name": "SENSEN",
        "type": "input",
        "description": "Sense input for the external high-voltage power path current-sense resistance; short to VBUS when unused."
      },
      {
        "number": "30",
        "name": "SENSEP",
        "type": "input",
        "description": "Positive sense input for the external high-voltage power path current-sense resistance; short to VBUS when unused."
      },
      {
        "number": "31",
        "name": "HV_GATE1",
        "type": "output",
        "description": "External NFET gate control for the high-voltage power path (POR: shorted to SENSEP); float when unused."
      },
      {
        "number": "32",
        "name": "HV_GATE2",
        "type": "output",
        "description": "External NFET gate control for the high-voltage power path (POR: shorted to VBUS); float when unused."
      },
      {
        "number": "33",
        "name": "PP_HV",
        "type": "power_in",
        "description": "HV supply for VBUS; bypass with CPP_HV to GND, tie to GND when unused."
      },
      {
        "number": "34",
        "name": "PP_HV",
        "type": "power_in",
        "description": "HV supply for VBUS; bypass with CPP_HV to GND, tie to GND when unused."
      },
      {
        "number": "35",
        "name": "SPI_POCI",
        "type": "input",
        "description": "SPI serial controller input from peripheral; tie to LDO_3V3 through a 3.3-kΩ resistor."
      },
      {
        "number": "36",
        "name": "SPI_PICO",
        "type": "output",
        "description": "SPI serial controller output to peripheral; connect directly to SPI flash IC."
      },
      {
        "number": "37",
        "name": "SPI_CLK",
        "type": "output",
        "description": "SPI serial clock; connect directly to SPI flash IC."
      },
      {
        "number": "38",
        "name": "GPIO7",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 7; float if configured as push-pull output, otherwise ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "39",
        "name": "SPI_CSZ",
        "type": "output",
        "description": "SPI chip select; tie to LDO_3V3 through a 3.3-kΩ resistor."
      },
      {
        "number": "40",
        "name": "LDO_1V8D",
        "type": "power_out",
        "description": "Output of the 1.8-V LDO for core digital circuits; bypass with CLDO_1V8D to GND."
      },
      {
        "number": "41",
        "name": "GPIO0",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 0; float if configured as push-pull output, otherwise ground with a 1-MΩ resistor when unused."
      },
      {
        "number": "42",
        "name": "VDDIO",
        "type": "power_in",
        "description": "VDD for I/O, optionally powering reconfigurable I/Os instead of LDO_3V3; tie to LDO_3V3 when not used, otherwise bypass with CVDDIO to GND."
      },
      {
        "number": "43",
        "name": "I2C_IRQZ",
        "type": "output",
        "description": "I2C port interrupt, active low; implement externally as open-drain with a pull-up, float when unused."
      },
      {
        "number": "44",
        "name": "DEBUG_CTL2",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 17; pin state at power-up sets bit 5 of the I2C address."
      },
      {
        "number": "45",
        "name": "DEBUG_CTL1",
        "type": "bidirectional",
        "description": "General-purpose digital I/O 16; pin state at power-up sets bit 4 of the I2C address."
      },
      {
        "number": "46",
        "name": "I2C_SDA",
        "type": "bidirectional",
        "description": "I2C port serial data, open-drain; tie to LDO_3V3 or VDDIO through a 10-kΩ resistor whether used or unused."
      },
      {
        "number": "47",
        "name": "I2C_SCL",
        "type": "bidirectional",
        "description": "I2C port serial clock, open-drain; tie to LDO_3V3 or VDDIO through a 10-kΩ resistor whether used or unused."
      },
      {
        "number": "48",
        "name": "LDO_BMC",
        "type": "power_out",
        "description": "Output of the USB-PD BMC transceiver output level LDO; bypass with CLDO_BMC to GND."
      },
      {
        "number": "49",
        "name": "SWD_DATA",
        "type": "bidirectional",
        "description": "SWD serial data with resistive pull-high at POR; float when unused."
      },
      {
        "number": "50",
        "name": "SWD_CLK",
        "type": "input",
        "description": "SWD serial clock with resistive pull-high at POR; float when unused."
      },
      {
        "number": "51",
        "name": "LDO_3V3",
        "type": "power_out",
        "description": "Output of the VBUS to 3.3-V LDO or connected to VIN_3V3 by a switch; main internal supply rail, powers external flash; bypass with CLDO_3V3 to GND."
      },
      {
        "number": "52",
        "name": "R_OSC",
        "type": "passive",
        "description": "External resistance setting oscillator accuracy; connect to GND through RR_OSC."
      },
      {
        "number": "53",
        "name": "VIN_3V3",
        "type": "power_in",
        "description": "Supply for core circuitry and I/O; bypass with CVIN_3V3 to GND."
      },
      {
        "number": "54",
        "name": "AUX_P",
        "type": "bidirectional",
        "description": "System-side DisplayPort connection to the port multiplexer; ground with 1-kΩ to 5-MΩ resistance when unused."
      },
      {
        "number": "55",
        "name": "AUX_N",
        "type": "bidirectional",
        "description": "System-side DisplayPort connection to the port multiplexer; ground with 1-kΩ to 5-MΩ resistance when unused."
      },
      {
        "number": "56",
        "name": "LDO_1V8A",
        "type": "power_out",
        "description": "Output of the 1.8-V LDO for core analog circuits; bypass with CLDO_1V8A to GND."
      },
      {
        "number": "57",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (exposed thermal pad); connect directly to the ground plane per the Layout Guidelines."
      }
    ],
    "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: Thermal pad is an unnumbered exposed pad (GND, power_in per the table) and is not a numbered pin, so; Pin 3 name conflict: Figure 6-1 prints 'CS' but Table 6-1 names it 'SS' (soft start). 'SS' was used ; Pin 39 name conflict: Figure 6-1 prints 'SPI_SSZ' but Table 6-1 names it 'SPI_CSZ' (SPI chip select)",
          "exposed pad 57 added from the footprint"
        ],
        "pages_sent": 25,
        "cost_usd": 0.1816,
        "at": "2026-10-08T21:41:12"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/tps65981",
        "pages": 99,
        "sha256": "32d5d9c3514f4aa3",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 57,
        "described": 57,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "tps65981abirtqr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          8.0,
          8.0,
          1.0
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "54eb482f12c9d8b70c1bfc78306a1c34f412f3556e225cbd097840e5abdb7981",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "tps65981abirtqr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          8.0,
          8.0,
          1.0
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "069c680c807bec9a78c72e4886c6c1a3732600a9baf695a522d1ed79a0d76405",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}