UCC3946DTR

{
  "slug": "ucc3946dtr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Supervisor And Reset ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "ucc3946dtr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ucc3946dtr.kicad_sym",
    "ucc3946dtr.kicad_mod",
    "ucc3946dtr.glb",
    "ucc3946dtr.step",
    "ucc3946dtr.lbr",
    "docs/hero.png",
    "docs/ucc3946dtr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ucc3946dtr-hero.glb",
    "ucc3946dtr-hero.overlay.json"
  ],
  "component": {
    "mpn": "UCC3946DTR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "Supervisor And Reset ICs",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ucc3946",
    "parts": {
      "symbol": "ucc3946dtr.kicad_sym",
      "footprint": "ucc3946dtr.kicad_mod",
      "model_3d": "ucc3946dtr-hero.glb",
      "model_3d_plain": "ucc3946dtr.glb",
      "model_3d_step": "ucc3946dtr-etched.step",
      "model_3d_step_plain": "ucc3946dtr.step",
      "lbr": "ucc3946dtr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2067045",
      "digikey": "296-29083-2-ND",
      "mouser": "595-UCC3946DTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T19:15:43Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-29083-2-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-UCC3946DTR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "2",
        "name": "RTH",
        "type": "input",
        "description": "Compares its voltage to an internal 1.25-V reference, so external resistors can program any desired reset threshold; the application information gives the threshold as VRESET = 1.235 V × (R1 + R2) / R2."
      },
      {
        "number": "3",
        "name": "RES",
        "type": "output",
        "description": "Reset output is high only when RTH has risen above 1.235 V, stays low for the reset period once RTH rises above the threshold, and asserts low for an amount of time set by Figure 1 if RTH dips below 1.235 V."
      },
      {
        "number": "4",
        "name": "RP",
        "type": "input",
        "description": "Programs the reset period with an external capacitor, where TRP = 3.125 × CRP (TRP in ms, CRP in nF) and CRP is charged by a 400-nA precision source."
      },
      {
        "number": "5",
        "name": "WDO",
        "type": "output",
        "description": "Watchdog output is asserted low if WDI is not strobed or toggled within the watchdog period, and it returns high when RES is asserted."
      },
      {
        "number": "6",
        "name": "WP",
        "type": "input",
        "description": "Programs the watchdog period with an external capacitor, where TWP = 25 × CWP (TWP in ms, CWP in nF)."
      },
      {
        "number": "7",
        "name": "WDI",
        "type": "input",
        "description": "Input to the watchdog timer; if it is not toggled or strobed within the watchdog period, WDO is asserted (VIH min 0.7×VDD, VIL max 0.3×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 minimum operating voltage of 1.0 V where RES is considered valid."
      }
    ],
    "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: RTH reference is stated as 1.25 V in the terminal functions table but as 1.235 V in the electrical c; The pinout is taken from the D (SOIC-8) package top view on page 2. The UCC3946DTR is listed as SOIC"
        ],
        "pages_sent": 20,
        "cost_usd": 0.0753,
        "at": "2026-10-08T19:15:05"
      },
      "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": "ucc3946dtr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc3946dtr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dd529c8eb1943e6f3127a8d1265a1874242170ee0c8af1866498c190d8f816dc",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}