UCC3817DWTR

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  "type": "component",
  "slug": "ucc3817dwtr",
  "title": "UCC3817DWTR",
  "brief": "Texas Instruments AC-DC Controllers And Regulators, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "power management (pmic)",
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  "component": {
    "mpn": "UCC3817DWTR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16-300mil",
    "pin_count": 16,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/cn/lit/gpn/ucc2818",
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    "distributor_links": {
      "lcsc": "C3094010",
      "digikey": "UCC3817DWTR-ND",
      "mouser": "595-UCC3817DWTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-12T11:58:18Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "UCC3817DWTR-ND",
        "status": "found",
        "lifecycle": "Active"
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      "mouser": {
        "pn": "595-UCC3817DWTR",
        "status": "found"
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    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all voltages, and VCC and VREF should be bypassed directly to GND with a 0.1-µF or larger ceramic capacitor."
      },
      {
        "number": "2",
        "name": "PKLMT",
        "type": "input",
        "description": "PFC peak current limit input with a threshold of 0 V, where peak limit is reached when the voltage falls below 0 V, and the absolute maximum input voltage is 5 V."
      },
      {
        "number": "3",
        "name": "CAOUT",
        "type": "output",
        "description": "Output of the wide-bandwidth current amplifier that commands the PFC PWM duty cycle, with compensation components placed between CAOUT and MOUT."
      },
      {
        "number": "4",
        "name": "CAI",
        "type": "input",
        "description": "Noninverting input of the current amplifier, which remains functional down to and below GND, with an absolute maximum input voltage of 8 V."
      },
      {
        "number": "5",
        "name": "MOUT",
        "type": "bidirectional",
        "description": "Multiplier output and inverting current amplifier input, a high-impedance node whose multiplier output current is limited to 2 × IIAC, with a maximum negative voltage of -0.5 V."
      },
      {
        "number": "6",
        "name": "IAC",
        "type": "input",
        "description": "Current input proportional to instantaneous line voltage to the analog multiplier, with a recommended maximum IIAC of 500 µA."
      },
      {
        "number": "7",
        "name": "VAOUT",
        "type": "output",
        "description": "Output of the voltage error amplifier that regulates output voltage, internally limited to approximately 5.5 V to prevent overshoot."
      },
      {
        "number": "8",
        "name": "VFF",
        "type": "input",
        "description": "Feed-forward voltage generated by mirroring 1/2 of IIAC into an external single-pole filter, which should be 1.4 V at low line."
      },
      {
        "number": "9",
        "name": "VREF",
        "type": "power_in",
        "description": "Output of an accurate 7.5-V voltage reference capable of delivering 20 mA, internally short-circuit current limited, and held at 0 V when VCC is below the UVLO threshold, with a 0.1-µF or larger bypass capacitor recommended."
      },
      {
        "number": "10",
        "name": "OVP/EN",
        "type": "input",
        "description": "Window comparator input that disables the output driver on boost overvoltage and disables the driver and resets SS when pulled below 1.9 V (typ), with an absolute maximum input voltage of 10 V."
      },
      {
        "number": "11",
        "name": "VSENSE",
        "type": "input",
        "description": "Inverting input of the voltage error amplifier, normally connected to a compensation network and to the boost output through a divider, with an absolute maximum input voltage of 10 V."
      },
      {
        "number": "12",
        "name": "RT",
        "type": "input",
        "description": "Oscillator charging current programming pin, where a resistor between 10 kΩ and 100 kΩ is recommended and the nominal voltage on the pin is 3 V."
      },
      {
        "number": "13",
        "name": "SS",
        "type": "input",
        "description": "Soft-start pin that is charged by a current source into an external capacitor to slowly increase PWM duty cycle, is discharged when VCC is low, and has an absolute maximum input voltage of 8 V."
      },
      {
        "number": "14",
        "name": "CT",
        "type": "input",
        "description": "Oscillator timing capacitor connection where a capacitor from CT to GND sets the PWM frequency according to f ≈ 0.6/(RT × CT), with the lead to GND kept as short as possible."
      },
      {
        "number": "15",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply that must provide at least 20 mA between 10 V and 17 V for normal operation, with an absolute maximum supply voltage of 18 V."
      },
      {
        "number": "16",
        "name": "DRVOUT",
        "type": "output",
        "description": "Totem-pole MOSFET gate drive output for the boost switch, where a series gate resistor is recommended to limit overshoot, with a continuous gate drive current of 0.2 A and a peak of 1.2 A."
      }
    ],
    "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 lists VCC as type 'I' (input); it is a supply pin, so it is typed as power_in here. Co; The datasheet lists VREF as type 'O' (output); it is a regulated reference output, so it is typed as; The pin table is shared by the D, DW, N and PW packages (16 pins, same top view). The DW package is "
        ],
        "pages_sent": 13,
        "cost_usd": 0.0872,
        "at": "2026-10-12T11:58:02"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ucc2818",
        "pages": 46,
        "sha256": "ca94b4ec262a1f44",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
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        "refuses_to_fabricate": true
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        "centre_offset_mm": 0,
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        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-12",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-16-300mil",
      "Category": "Power Management (PMIC)",
      "Pins": "16"
    }
  },
  "variants": [],
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  "discovery_pitch": "UCC3817DWTR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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