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Ray Set visibility: public 9bda0ea 7d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "ucc28251pwr",
  "title": "UCC28251PWR",
  "brief": "Texas Instruments AC-DC Controllers & Regulators, TSSOP-20. 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 management ics",
    "ucc28251pwr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UCC28251PWR",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Power Management ICs",
    "subcategory": "AC-DC Controllers & Regulators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ucc28251.pdf",
    "parts": {
      "symbol": "ucc28251pwr.kicad_sym",
      "footprint": "ucc28251pwr.kicad_mod",
      "model_3d": "ucc28251pwr-hero.glb",
      "model_3d_plain": "ucc28251pwr-etched.glb",
      "model_3d_step": "ucc28251pwr-etched.step",
      "model_3d_step_plain": "ucc28251pwr.step",
      "lbr": "ucc28251pwr.lbr"
    },
    "distributor_links": {
      "lcsc": "C702428",
      "digikey": "296-41053-2-ND",
      "mouser": "595-UCC28251PWR"
    },
    "distributor_check": {
      "checked_at": "2026-10-31T09:30:28Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-41053-2-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-UCC28251PWR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VSENSE",
        "type": "input",
        "description": "Output voltage sensing input for pre-bias control, with input range 0 to 3.3 V."
      },
      {
        "number": "2",
        "name": "RT",
        "type": "input",
        "description": "Oscillator frequency set resistor to ground or synchronous clock input, with RT resistor range 12.5 to 200 kΩ."
      },
      {
        "number": "3",
        "name": "RAMP/CS",
        "type": "input",
        "description": "PWM ramp input for voltage mode control or current sense input for current mode control, with voltage range 0 to 2.3 V."
      },
      {
        "number": "4",
        "name": "ILIM",
        "type": "input",
        "description": "Current sense input for cycle-by-cycle over-current protection, terminating the OUTA/OUTB pulse when above 0.5 V."
      },
      {
        "number": "5",
        "name": "EN",
        "type": "input",
        "description": "Device enable and disable input; pull to VREF if the enable function is not used."
      },
      {
        "number": "6",
        "name": "OVP/OTP",
        "type": "input",
        "description": "Over-voltage and over-temperature protection input that causes a fault shutdown when above 0.7 V."
      },
      {
        "number": "7",
        "name": "VREF",
        "type": "power_out",
        "description": "3.3-V reference output, requiring a 0.47 to 2.20 µF bypass capacitor."
      },
      {
        "number": "8",
        "name": "REF/EA+",
        "type": "input",
        "description": "Error amplifier non-inverting input with common mode range 0 to 3.0 V."
      },
      {
        "number": "9",
        "name": "FB/EA-",
        "type": "input",
        "description": "Error amplifier inverting input with common mode range 0 to 3.0 V."
      },
      {
        "number": "10",
        "name": "COMP",
        "type": "bidirectional",
        "description": "Error amplifier output, with 6.5 mA typical sink current and 4.5 mA typical source current."
      },
      {
        "number": "11",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "12",
        "name": "VDD",
        "type": "power_in",
        "description": "Bias supply input, 4.7 to 17 V recommended with at least 1 µF bypass capacitor."
      },
      {
        "number": "13",
        "name": "SRB",
        "type": "output",
        "description": "0.2-A sink/source synchronous rectifier output."
      },
      {
        "number": "14",
        "name": "SRA",
        "type": "output",
        "description": "0.2-A sink/source synchronous rectifier output."
      },
      {
        "number": "15",
        "name": "OUTB",
        "type": "output",
        "description": "0.2-A sink/source primary switching output."
      },
      {
        "number": "16",
        "name": "OUTA",
        "type": "output",
        "description": "0.2-A sink/source primary switching output."
      },
      {
        "number": "17",
        "name": "HICC",
        "type": "input",
        "description": "Cycle-by-cycle current limit time delay and hiccup time setting pin, programmed by a capacitor to ground."
      },
      {
        "number": "18",
        "name": "PS",
        "type": "input",
        "description": "Primary off to synchronous rectifier on dead-time set, with resistor range 5 to 250 kΩ."
      },
      {
        "number": "19",
        "name": "SP",
        "type": "input",
        "description": "Synchronous rectifier off to primary on dead-time set, with resistor range 5 to 250 kΩ."
      },
      {
        "number": "20",
        "name": "SS",
        "type": "bidirectional",
        "description": "Soft-start programming pin with 28 µA typical charge current, clamped at 3.6 V typical."
      }
    ],
    "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",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 16,
        "cost_usd": 0.1509,
        "at": "2026-10-31T09:30:15"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ucc28251.pdf",
        "pages": 58,
        "sha256": "67008ba993940d0e",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ucc28251pwr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ucc28251pwr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "bfd9a22246592cb52443bb34fc32fcedd3ed6fe4f6908c0da70b9213f82c7e9c",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "PW0020A",
      "source_page": 51,
      "D": {
        "nom_mm": 6.5,
        "range_mm": [
          6.4,
          6.6
        ]
      },
      "E1": {
        "nom_mm": 4.4,
        "range_mm": [
          4.3,
          4.5
        ]
      },
      "E": {
        "nom_mm": 6.4,
        "range_mm": [
          6.2,
          6.6
        ]
      },
      "e": {
        "nom_mm": 0.65,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.2,
        "range_mm": [
          null,
          1.2
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "ucc28251pwr.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSSOP-20",
      "Category": "Power Management ICs",
      "Pins": "20"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "67008ba993940d0ebd60cfb0e5eb029a7f3ff5a18f9bc2b408c5233641356d4f",
      "rows": [
        {
          "name": "Supply voltage range",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.7,
          "typ": 12,
          "max": 17,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature range",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Supply bypass capacitor",
          "symbol": "CVDD",
          "kind": "recommended_operating",
          "unit": "µF",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "VREF bypass capacitor",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "µF",
          "min": 0.47,
          "typ": null,
          "max": 2.2,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input common mode range",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 3,
          "conditions": "REF/EA+, FB/EA-",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "VSENSE input voltage range",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "V",
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          "typ": null,
          "max": 3.3,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "RT resistor range",
          "symbol": "",
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          "unit": "kΩ",
          "min": 12.5,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "PS, SP resistor range",
          "symbol": "",
          "kind": "recommended_operating",
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          "typ": null,
          "max": 250,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "RAMP/CS voltage range",
          "symbol": "",
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          "conditions": "",
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          "source": "datasheet"
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          "name": "Input supply voltage",
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          "min": -0.3,
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          "max": 20,
          "conditions": "",
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          "source": "datasheet"
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        {
          "name": "OUTA, OUTB, SRA and SRB voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "max VDD + 0.3 V",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "COMP voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "max VREF + 0.3 V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input voltages on SS and EN",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
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          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
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        {
          "name": "Input voltages on RT, PS, SP, ILIM, OVP, HICC, VSENSE, EA+, EA-",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 3.6,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Input voltage on RAMP/CS",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 4.3,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output voltage on VREF",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 3.6,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Lead temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "soldering 10 sec, PW package",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ESD HBM",
          "symbol": "V(ESD)",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -3000,
          "typ": null,
          "max": 3000,
          "conditions": "Human-body model, ANSI/ESDA/JEDEC JS-001",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "ESD CDM",
          "symbol": "V(ESD)",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -2000,
          "typ": null,
          "max": 2000,
          "conditions": "Charged-device model, JESD22-C101",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 60.3,
          "max": null,
          "conditions": "PW, with hot spot (39.3 without hot spot)",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (top) thermal resistance",
          "symbol": "RθJC(top)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 31.5,
          "max": null,
          "conditions": "PW",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-board thermal resistance",
          "symbol": "RθJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 55.8,
          "max": null,
          "conditions": "PW",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Startup current",
          "symbol": "IDD(off)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 150,
          "max": 275,
          "conditions": "VDD = 3.6 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Operating supply current",
          "symbol": "IDD",
          "kind": "electrical",
          "unit": "mA",
          "min": 1.2,
          "typ": 2,
          "max": 2.5,
          "conditions": "100-pF capacitor on OUTA, OUTB, SRA and SRB",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Standby current",
          "symbol": "IDD(dis)",
          "kind": "electrical",
          "unit": "µA",
          "min": 250,
          "typ": 425,
          "max": 600,
          "conditions": "EN = 0 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Start threshold",
          "symbol": "VUVLOR",
          "kind": "electrical",
          "unit": "V",
          "min": 4,
          "typ": 4.3,
          "max": 4.65,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Minimum operating voltage after start",
          "symbol": "VUVLOF",
          "kind": "electrical",
          "unit": "V",
          "min": 3.8,
          "typ": 4.1,
          "max": 4.4,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "UVLO Hysteresis",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 0.15,
          "typ": 0.2,
          "max": 0.25,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Soft-start charge current",
          "symbol": "ISS",
          "kind": "electrical",
          "unit": "µA",
          "min": 26,
          "typ": 28,
          "max": 30,
          "conditions": "VSS = 0 V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Soft-start clamp voltage",
          "symbol": "VSS(max)",
          "kind": "electrical",
          "unit": "V",
          "min": 3.3,
          "typ": 3.6,
          "max": 4,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Enable trigger threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.5,
          "typ": 2,
          "max": 2.25,
          "conditions": "",
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