UCC21521CDWR

{
  "slug": "ucc21521cdwr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Isolators - Gate Drivers, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "ucc21521cdwr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ucc21521cdwr.kicad_sym",
    "ucc21521cdwr.kicad_mod",
    "ucc21521cdwr.glb",
    "ucc21521cdwr.step",
    "ucc21521cdwr.lbr",
    "docs/hero.png",
    "docs/ucc21521cdwr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ucc21521cdwr-hero.glb",
    "ucc21521cdwr-hero.overlay.json"
  ],
  "component": {
    "mpn": "UCC21521CDWR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16-300mil",
    "pin_count": 16,
    "category": "Power Management (PMIC)",
    "subcategory": "Isolators - Gate Drivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ucc21521",
    "parts": {
      "symbol": "ucc21521cdwr.kicad_sym",
      "footprint": "ucc21521cdwr.kicad_mod",
      "model_3d": "ucc21521cdwr-hero.glb",
      "model_3d_plain": "ucc21521cdwr.glb",
      "model_3d_step": "ucc21521cdwr-etched.step",
      "model_3d_step_plain": "ucc21521cdwr.step",
      "lbr": "ucc21521cdwr.lbr"
    },
    "distributor_links": {
      "lcsc": "C189707",
      "digikey": "296-47680-2-ND",
      "mouser": "595-UCC21521CDWR"
    },
    "distributor_check": {
      "checked_at": "2026-10-07T21:41:42Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-47680-2-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-UCC21521CDWR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "INA",
        "type": "input",
        "description": "Input signal for the A channel with a TTL/CMOS compatible threshold; the pin is pulled low internally if left open and should be tied to ground if unused."
      },
      {
        "number": "2",
        "name": "INB",
        "type": "input",
        "description": "Input signal for the B channel with a TTL/CMOS compatible threshold; the pin is pulled low internally if left open and should be tied to ground if unused."
      },
      {
        "number": "3",
        "name": "VCCI",
        "type": "power_in",
        "description": "Primary-side supply voltage (3 V to 18 V recommended range), locally decoupled to GND with a low ESR/ESL capacitor placed as close to the device as possible."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Primary-side ground reference; all primary-side signals are referenced to this pin."
      },
      {
        "number": "5",
        "name": "EN",
        "type": "input",
        "description": "Enables both driver outputs when high or left open (internally pulled high) and disables the outputs when low; tying it to VCCI is recommended for better noise immunity when unused."
      },
      {
        "number": "6",
        "name": "DT",
        "type": "input",
        "description": "Programmable dead-time pin: tying it to VCCI allows overlap, while a 500 Ω to 500 kΩ resistor to GND sets dead time as DT (ns) = 10 × RDT (kΩ), with a ceramic capacitor of 2.2 nF or above recommended in parallel; leaving it floating is not recommended."
      },
      {
        "number": "7",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "8",
        "name": "VCCI",
        "type": "power_in",
        "description": "Primary-side supply voltage, internally shorted to pin 3 (VCCI), so it should be connected and decoupled alongside pin 3."
      },
      {
        "number": "9",
        "name": "VSSB",
        "type": "power_in",
        "description": "Ground for the secondary-side driver B and its ground reference for the B channel."
      },
      {
        "number": "10",
        "name": "OUTB",
        "type": "output",
        "description": "Output of driver B; connect to the gate of the B-channel FET or IGBT."
      },
      {
        "number": "11",
        "name": "VDDB",
        "type": "power_in",
        "description": "Secondary-side power for driver B, to be locally decoupled to VSSB with a low ESR/ESL capacitor placed as close to the device as possible."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "14",
        "name": "VSSA",
        "type": "power_in",
        "description": "Ground for secondary-side driver A and its ground reference for the A channel."
      },
      {
        "number": "15",
        "name": "OUTA",
        "type": "output",
        "description": "Output of driver A; connect to the gate of the A-channel FET or IGBT."
      },
      {
        "number": "16",
        "name": "VDDA",
        "type": "power_in",
        "description": "Secondary-side power for driver A, to be locally decoupled to VSSA with a low ESR/ESL capacitor placed as close to the device as possible."
      }
    ],
    "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: Pinout taken from the DW 16-pin SOIC top-view figure and Table 5-1 (page 3). The DW package is the o; Pin 3 and pin 8 are both VCCI; pin 8 is internally shorted to pin 3 per the datasheet, so both are l"
        ],
        "pages_sent": 14,
        "cost_usd": 0.0861,
        "at": "2026-10-07T21:41:20"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ucc21521",
        "pages": 50,
        "sha256": "93b1d040e8ae41ee",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ucc21521cdwr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc21521cdwr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
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          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d76f4f4bb3604b394e787e3f9a17057857a11218e716f60bc1c0944436a065ff",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}