UCC3946PWTR

{
  "schema_version": 1,
  "type": "component",
  "slug": "ucc3946pwtr",
  "title": "UCC3946PWTR",
  "brief": "Texas Instruments Monitors & Reset Circuits, TSSOP-8. 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",
    "power supply chip",
    "ucc3946pwtr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UCC3946PWTR",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-8",
    "pin_count": 8,
    "category": "Power Supply Chip",
    "subcategory": "Monitors & Reset Circuits",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ucc3946",
    "parts": {
      "symbol": "ucc3946pwtr.kicad_sym",
      "footprint": "ucc3946pwtr.kicad_mod",
      "model_3d": "ucc3946pwtr-hero.glb",
      "model_3d_plain": "ucc3946pwtr.glb",
      "model_3d_step": "ucc3946pwtr-etched.step",
      "model_3d_step_plain": "ucc3946pwtr.step",
      "lbr": "ucc3946pwtr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2070177",
      "digikey": "UCC3946PWTR-ND",
      "mouser": "595-UCC3946PWTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T06:58:07Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "UCC3946PWTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UCC3946PWTR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "2",
        "name": "RTH",
        "type": "input",
        "description": "Reset threshold input compared to an internal 1.235 V reference (the pin table says 1.25 V); external resistors R1 and R2 program the reset threshold."
      },
      {
        "number": "3",
        "name": "RES",
        "type": "output",
        "description": "Active-low reset output that goes high only after RTH has risen above 1.235 V and the reset period has elapsed, and is ensured low for VDD down to 1 V."
      },
      {
        "number": "4",
        "name": "RP",
        "type": "input",
        "description": "Reset period programming pin; an external capacitor sets the period (TRP = 3.125 x CRP, with TRP in ms and CRP in nF) and is charged by a 400 nA source."
      },
      {
        "number": "5",
        "name": "WDO",
        "type": "output",
        "description": "Active-low watchdog output that is asserted low if WDI is not toggled within the watchdog period."
      },
      {
        "number": "6",
        "name": "WP",
        "type": "input",
        "description": "Watchdog period programming pin; an external capacitor sets the period (TWP = 25 x CWP, with TWP in ms and CWP in nF)."
      },
      {
        "number": "7",
        "name": "WDI",
        "type": "input",
        "description": "Watchdog timer input that must be toggled within the watchdog period to prevent WDO from being asserted, with VIH = 0.7 x VDD and VIL = 0.3 x VDD."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply voltage for the device, 2.0 V to 5.5 V for the UCC3946, with a 0.1 uF decoupling capacitor to GND recommended."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet only prints the pinout diagram for the D (SOIC-8) package, and the terminal table give; The terminal table gives the RTH reference as 1.25 V, while the block diagram and electrical charact; The datasheet table lists GND and VDD with I/O '-' and 'I', not as power types. They are classified ",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 20,
        "cost_usd": 0.2392,
        "at": "2026-10-11T06:57:53"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ucc3946",
        "pages": 20,
        "sha256": "6dea29f2ee7ad735",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ucc3946pwtr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "cf28a51742b2e31065e201d1b313207140cbfb49062efd938788f7a310d02738",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc3946pwtr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "6da4880efd2bbb10ded46f8c5ffdbf3730045e5004f795145fb132ce4fd5974e",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSSOP-8",
      "Category": "Power Supply Chip",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ucc3946pwtr"
  ],
  "discovery_pitch": "UCC3946PWTR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "ucc3946pwtr.kicad_sym",
    "ucc3946pwtr.kicad_mod",
    "ucc3946pwtr.glb",
    "ucc3946pwtr.step",
    "ucc3946pwtr.lbr",
    "docs/hero.png",
    "docs/ucc3946pwtr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ucc3946pwtr-hero.glb",
    "ucc3946pwtr-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}