UCC28C43DR

{
  "schema_version": 1,
  "type": "component",
  "slug": "ucc28c43dr",
  "title": "UCC28C43DR",
  "brief": "Texas Instruments AC-DC Controllers and Regulators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "ucc28c43dr"
  ],
  "component": {
    "mpn": "UCC28C43DR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ucc28c43.pdf",
    "parts": {
      "symbol": "ucc28c43dr.kicad_sym",
      "footprint": "ucc28c43dr.kicad_mod",
      "model_3d": "ucc28c43dr-etched.glb",
      "model_3d_plain": "ucc28c43dr.glb",
      "model_3d_step": "ucc28c43dr-etched.step",
      "model_3d_step_plain": "ucc28c43dr.step",
      "lbr": "ucc28c43dr.lbr"
    },
    "distributor_links": {
      "digikey": "296-27164-2-ND",
      "lcsc": "C111694"
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output used for loop compensation. Frequently used as a control port by driving via a secondary-side opto-isolator; the error amplifier is internally current limited so forcing COMP to GND commands zero duty cycle."
      },
      {
        "number": "2",
        "name": "FB",
        "type": "input",
        "description": "Inverting input to the internal error amplifier used to control the power converter voltage-feedback loop for stability. The non-inverting input is internally trimmed to 2.5V ± 1%."
      },
      {
        "number": "3",
        "name": "CS",
        "type": "input",
        "description": "Primary-side current sense input (non-inverting input to the PWM comparator). Connect to the current-sense resistor; when this signal exceeds the scaled error-amplifier voltage the PWM terminates OUT conduction. A voltage ramp may be applied here for voltage-mode operation. COMP-to-CS offset ≈ 1.15V, max CS input signal ≈ 1V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Fixed-frequency oscillator timing node. Connect timing resistor R_RT from VREF to this pin and timing capacitor C_CT from this pin to GND to set switching frequency (fSW = fOSC for the C43). Peak-to-peak ramp ≈ 1.9V; internal discharge current ≈ 8.4mA (with R_RT = 10kΩ)."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground return pin for the output driver stage and the logic-level controller section. All voltages are referenced to this pin."
      },
      {
        "number": "6",
        "name": "OUT",
        "type": "output",
        "description": "High-current totem-pole gate-drive output intended to directly drive an external MOSFET gate. Rail-to-rail ±1A peak (source/sink), 25ns rise / 20ns fall into 1nF; runs at the oscillator frequency with up to ~100% duty cycle for the UCC28C43. OUT is actively held low when VDD is below the turn-on threshold."
      },
      {
        "number": "7",
        "name": "VDD",
        "type": "power_in",
        "description": "Analog controller bias supply input (recommended operating range up to 18V, absolute max 20V). Requires a 0.1µF bypass to GND with minimal trace length and additional bulk capacitance ≥ 10× the external MOSFET gate capacitance. UVLO turn-on 8.4V / turn-off 7.6V (C43 variant); startup current 50µA typ, operating current 2.3mA typ."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5V ±1% precision reference output used to source oscillator timing current through R_RT and to power light external loads (up to 20mA source). Must be bypassed to GND with at least a 0.1µF ceramic located close to the pin for stability."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ucc28c43.pdf",
        "pages": 60,
        "sha256": "9fa55f996731c56b",
        "source_tier": "mfr"
      },
      "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
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        "file": "ucc28c43dr.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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc28c43dr-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": "97be2b80b899b8f137fe20c4587c849201348312d2863d935b95ca6881844850",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ucc28c43dr"
  ],
  "discovery_pitch": "UCC28C43DR (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "ucc28c43dr.step",
    "ucc28c43dr-etched.step",
    "ucc28c43dr.lbr",
    "docs/hero.png",
    "docs/ucc28c43dr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "UCC28C43DRD",
      "kind": "packaging"
    },
    {
      "mpn": "UCC28C43DR",
      "kind": "packaging"
    },
    {
      "mpn": "UCC28C43DRDGK",
      "kind": "packaging"
    },
    {
      "mpn": "UCC28C43DRDGKR",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T13:40:00.346Z"
}