UCC28251RGPT

{
  "schema_version": 1,
  "type": "component",
  "slug": "ucc28251rgpt",
  "title": "UCC28251RGPT",
  "brief": "Texas Instruments AC-DC Controllers & Regulators, VQFN-20-EP(4x4). 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",
    "ucc28251rgpt",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "UCC28251RGPT",
    "manufacturer": "Texas Instruments",
    "package": "VQFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Power Supply Chip",
    "subcategory": "AC-DC Controllers & Regulators",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ucc28251",
    "parts": {
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      "footprint": "ucc28251rgpt.kicad_mod",
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      "model_3d_step_plain": "ucc28251rgpt.step",
      "lbr": "ucc28251rgpt.lbr"
    },
    "distributor_links": {
      "lcsc": "C702429",
      "digikey": "296-UCC28251RGPTTR-ND",
      "mouser": "595-UCC28251RGPT"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T01:47:20Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-UCC28251RGPTTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UCC28251RGPT",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "REF/EA+",
        "type": "input",
        "description": "Error amplifier non-inverting input, with a common-mode range of 0 V to 3.0 V."
      },
      {
        "number": "2",
        "name": "FB/EA-",
        "type": "input",
        "description": "Error amplifier inverting input, with a common-mode range of 0 V to 3.0 V."
      },
      {
        "number": "3",
        "name": "COMP",
        "type": "bidirectional",
        "description": "Error amplifier output; in primary-side control the COMP pin is shorted to FB/EA- and the soft-start voltage is followed."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all pins."
      },
      {
        "number": "5",
        "name": "VDD",
        "type": "power_in",
        "description": "Bias supply input with a recommended range of 4.7 V to 17 V and an absolute maximum of 20 V."
      },
      {
        "number": "6",
        "name": "SRB",
        "type": "output",
        "description": "0.2-A sink/source synchronous rectifier output."
      },
      {
        "number": "7",
        "name": "SRA",
        "type": "output",
        "description": "0.2-A sink/source synchronous rectifier output."
      },
      {
        "number": "8",
        "name": "OUTB",
        "type": "output",
        "description": "0.2-A sink/source primary switching output."
      },
      {
        "number": "9",
        "name": "OUTA",
        "type": "output",
        "description": "0.2-A sink/source primary switching output."
      },
      {
        "number": "10",
        "name": "HICC",
        "type": "input",
        "description": "Sets the cycle-by-cycle current-limit shutdown delay and the hiccup restart time through an external capacitor to GND; the HICC threshold is 0.6 V and the pin is rated to 3.6 V."
      },
      {
        "number": "11",
        "name": "PS",
        "type": "input",
        "description": "Primary-off to synchronous-rectifier-on dead-time set by a resistor to GND, with a resistor range of 5 kΩ to 250 kΩ."
      },
      {
        "number": "12",
        "name": "SP",
        "type": "input",
        "description": "Synchronous-rectifier-off to primary-on dead-time set by a resistor to GND, with a resistor range of 5 kΩ to 250 kΩ."
      },
      {
        "number": "13",
        "name": "SS",
        "type": "bidirectional",
        "description": "Soft-start programming pin with a 26 µA to 30 µA charge current and a clamp voltage of 3.3 V to 4.0 V; pulling it low externally shuts down the controller."
      },
      {
        "number": "14",
        "name": "VSENSE",
        "type": "input",
        "description": "Output voltage sensing for pre-bias control with an input range of 0 V to 3.3 V."
      },
      {
        "number": "15",
        "name": "RT",
        "type": "input",
        "description": "Oscillator frequency set by a resistor to GND (12.5 kΩ to 200 kΩ) or external synchronous clock input (84 kHz to 1.89 MHz)."
      },
      {
        "number": "16",
        "name": "RAMP/CS",
        "type": "input",
        "description": "PWM ramp input for voltage-mode control or current-sense input for current-mode control, with a voltage range of 0 V to 2.3 V."
      },
      {
        "number": "17",
        "name": "ILIM",
        "type": "input",
        "description": "Current sense for cycle-by-cycle over-current protection; the output pulse terminates when the voltage exceeds 0.5 V."
      },
      {
        "number": "18",
        "name": "EN",
        "type": "input",
        "description": "Device enable and disable with a trigger threshold of 2.0 V typical; pull to VREF if the enable function is not used."
      },
      {
        "number": "19",
        "name": "OVP/OTP",
        "type": "input",
        "description": "Over-voltage and over-temperature protection input; a voltage above 0.7 V causes a fault shutdown."
      },
      {
        "number": "20",
        "name": "VREF",
        "type": "power_out",
        "description": "3.3 V reference output (3.17 V to 3.33 V) that requires a 0.47 µF to 2.2 µF bypass capacitor."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: The datasheet's pin table gives numbered pins 1 to 20 only. The exposed thermal pad of the VQFN-20-E; The MPN UCC28251RGPT maps to package RGP (QFN, 20 pins) in the Package Option Addendum (page 46). Th; Pin types are KiCad ERC classes mapped from the datasheet I/O column: I to input, O to output, I/O t",
          "exposed pad 21 added from the footprint"
        ],
        "pages_sent": 16,
        "cost_usd": 0.082,
        "at": "2026-10-11T01:47:06"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ucc28251",
        "pages": 58,
        "sha256": "8c6282d6aa147bda",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc28251rgpt-etched.step",
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        "sha256": "7693a671271ba1f731f53041c4099837018a7d0f6e59b9fec5d9a51df7c8d96d",
        "checked": "2026-10-11",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "VQFN-20-EP(4x4)",
      "Category": "Power Supply Chip",
      "Pins": "21"
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
    "ucc28251rgpt"
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  "discovery_pitch": "UCC28251RGPT (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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