UC3845D

{
  "slug": "uc3845d",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments AC-DC Controllers And Regulators, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3845d",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
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  "component": {
    "mpn": "UC3845D",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/cn/lit/gpn/uc3842",
    "parts": {
      "symbol": "uc3845d.kicad_sym",
      "footprint": "uc3845d.kicad_mod",
      "model_3d": "uc3845d-hero.glb",
      "model_3d_plain": "uc3845d.glb",
      "model_3d_step": "uc3845d-etched.step",
      "model_3d_step_plain": "uc3845d.step",
      "lbr": "uc3845d.lbr"
    },
    "distributor_links": {
      "lcsc": 1530206,
      "digikey": "296-11298-5-ND",
      "mouser": "595-UC3845D"
    },
    "distributor_check": {
      "checked_at": "2026-10-06T17:26:39Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-11298-5-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UC3845D",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier compensation pin for external compensation network connection to modify output voltage and enable pulse-by-pulse current limiting with internal current limit control."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "3",
        "name": "VFB",
        "type": "input",
        "description": "Error amplifier inverting input with -2µA input bias current accepting feedback voltage maximum 2.58V for voltage-loop control and closed-loop output regulation."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "5",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary-side current-sense input to PWM comparator accepting maximum 1.0V nominal with -10µA input bias current and 150-300ns propagation delay for OUTPUT pulse termination."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "7",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Oscillator timing pin with 1.7V peak-to-peak amplitude; connect timing resistor (5kΩ minimum) from VREF and timing capacitor (1nF to 100nF) to GROUND for programmable frequency 100-500kHz using fOSC = 1.72/(RRT×CCT)."
      },
      {
        "number": "8",
        "name": "PWRGND",
        "type": "power_in",
        "description": "Power stage ground providing high-current return path for output driver stage; requires direct connection to IC power devices for low-impedance connection."
      },
      {
        "number": "9",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog signal ground serving as low-impedance reference for control circuits and power return path when separate PWRGND is not available."
      },
      {
        "number": "10",
        "name": "OUTPUT",
        "type": "output",
        "description": "Gate driver output capable of sourcing and sinking ±1A peak current with 25-150ns rise and fall time for direct MOSFET gate drive; actively held low when VCC below turn-on threshold."
      },
      {
        "number": "11",
        "name": "VC",
        "type": "power_in",
        "description": "Bias power supply input for output gate driver stage (14-pin SOIC variant only); requires bypass capacitor value at least 10 times the main switch FET gate capacitance."
      },
      {
        "number": "12",
        "name": "VCC",
        "type": "power_in",
        "description": "Device power supply input requiring 12V to 28V operating range; total supply current equals static ICC (11-17mA) plus average output driver current; requires 0.1µF ceramic bypass capacitor."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "14",
        "name": "VREF",
        "type": "power_in",
        "description": "5V ±2% precision reference voltage output (4.9-5.1V for UC384x) with 180mA short-circuit current capability, 50μV output noise, and 0.1µF ceramic bypass capacitor required."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 38,
        "cost_usd": 0.3899,
        "at": "2026-10-06T17:26:23"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/uc3842",
        "pages": 61,
        "sha256": "0f875fd24cbb5fda",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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}