UC3854DWTR

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3854dwtr",
  "title": "UC3854DWTR",
  "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": [
    "component",
    "power management (pmic)",
    "uc3854dwtr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3854DWTR",
    "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/uc3854",
    "parts": {
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      "footprint": "uc3854dwtr.kicad_mod",
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      "model_3d_plain": "uc3854dwtr.glb",
      "model_3d_step": "uc3854dwtr-etched.step",
      "model_3d_step_plain": "uc3854dwtr.step",
      "lbr": "uc3854dwtr.lbr"
    },
    "distributor_links": {
      "lcsc": "C7120",
      "digikey": "296-27154-2-ND",
      "mouser": "595-UC3854DWTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-07T21:35:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-27154-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UC3854DWTR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all voltages; VCC and VREF must be bypassed directly to GND with a 0.1-µF or larger ceramic capacitor, and the timing-capacitor discharge current also returns here."
      },
      {
        "number": "2",
        "name": "PKLMT",
        "type": "input",
        "description": "Peak current-limit input with a 0-V threshold, connected to the negative side of the current-sense resistor, with an absolute maximum input voltage of 5 V."
      },
      {
        "number": "3",
        "name": "CAOUT",
        "type": "output",
        "description": "Current-amplifier output that swings close to GND so the PWM can force zero duty cycle, with an NPN emitter-follower pullup and an 8-kΩ resistor to ground, and it stays active when the IC is disabled."
      },
      {
        "number": "4",
        "name": "ISENSE",
        "type": "input",
        "description": "Inverting input of the current amplifier that stays functional down to and below GND, and must not be taken below -0.5 V because it is diode-protected to GND."
      },
      {
        "number": "5",
        "name": "MULTOUT",
        "type": "bidirectional",
        "description": "Multiplier output tied to the non-inverting current-amplifier input, a high-impedance node with a -0.3 V to 2.5 V input range that must not be taken below -0.5 V."
      },
      {
        "number": "6",
        "name": "IAC",
        "type": "input",
        "description": "Line-waveform current input whose voltage is internally held at 6 V, with the line current ranging from zero to about 400 µA at the waveform peak and an absolute maximum input current of 10 mA."
      },
      {
        "number": "7",
        "name": "VAOUT",
        "type": "output",
        "description": "Voltage-amplifier output internally limited to about 5.8 V, with an NPN emitter-follower pullup and an 8-kΩ resistor to ground, and output levels below 1 V inhibit the multiplier output."
      },
      {
        "number": "8",
        "name": "VRMS",
        "type": "input",
        "description": "RMS line-voltage input that must stay between 1.5 V and 3.5 V for best control, with an absolute maximum input voltage of 11 V."
      },
      {
        "number": "9",
        "name": "VREF",
        "type": "power_in",
        "description": "Accurate 7.5-V reference output that can deliver 10 mA to peripheral circuitry, is short-circuit current limited, is held at 0 V when VCC or ENA is low, and should be bypassed with 0.1 µF or larger."
      },
      {
        "number": "10",
        "name": "ENA",
        "type": "input",
        "description": "Logic enable input with a rising threshold of 2.4 V to 2.7 V (2.55 V typical) and about 0.25 V typical hysteresis, internally clamped to about 14 V, and it must be tied to 5 V or pulled high through 22 kΩ when unused."
      },
      {
        "number": "11",
        "name": "VSENSE",
        "type": "input",
        "description": "Inverting input of the voltage amplifier, normally connected to the feedback network from the boost output, with a 7.5-V threshold, an absolute maximum input voltage of 11 V, and a bias current limited to ±500 nA."
      },
      {
        "number": "12",
        "name": "RSET",
        "type": "input",
        "description": "Resistor to GND that sets the oscillator charging current and the maximum multiplier output, where multiplier output current does not exceed 3.75 V divided by the RSET resistance, with an absolute maximum input current of 10 mA."
      },
      {
        "number": "13",
        "name": "SS",
        "type": "input",
        "description": "Soft-start pin held at GND while the device is disabled or VCC is low, pulled up to over 8 V by an internal current source once VCC is valid and the IC is enabled, and quickly discharged to ground on disable or supply dropout."
      },
      {
        "number": "14",
        "name": "CT",
        "type": "input",
        "description": "Oscillator timing capacitor connected from CT to GND that sets the PWM oscillator frequency together with RSET, calculated per Equation 1 in the datasheet."
      },
      {
        "number": "15",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply with a recommended range of 10 V to 20 V and an absolute maximum of 35 V; it must exceed the 16 V typical turn-on threshold to start switching and stay above the 10 V typical turn-off threshold, and must deliver at least 20 mA."
      },
      {
        "number": "16",
        "name": "GTDRV",
        "type": "output",
        "description": "Totem-pole MOSFET gate-driver output internally clamped to 15 V, which should use a series gate resistor of at least 5 Ω, with absolute maximum gate-driver current of 1.5 A peak at 50% duty cycle and 0.5 A continuous."
      }
    ],
    "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 package hint SOIC-16-300mil is matched to the datasheet's SOIC (DW), 16-pin package, body 7.50 m; Internal inconsistency in the SS pin data: the Pin Functions text and Section 9 say the soft-start s; The NC pins (1, 6, 11, 16) appear only in the 20-pin PLCC column of the pin table, so the 16-pin SOI"
        ],
        "pages_sent": 15,
        "cost_usd": 0.101,
        "at": "2026-10-07T21:35:26"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/uc3854",
        "pages": 31,
        "sha256": "051276b5d66559af",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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      "footprint": "viewers/footprint.html"
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3854dwtr-etched.step",
        "role": "eda",
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        "centre_offset_mm": 0,
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        "sha256": "10d7e8b61726c1c33f5cbbfc9a87463f0f5c30ac1fb0adbbb4599a4aa542da06",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-16-300mil",
      "Category": "Power Management (PMIC)",
      "Pins": "16"
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
    "uc3854dwtr"
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  "discovery_pitch": "UC3854DWTR (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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