UC3844D

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3844d",
  "title": "UC3844D",
  "brief": "Texas Instruments AC-DC Controllers And Regulators, SOIC-14. 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)",
    "uc3844d",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3844D",
    "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": "uc3844d.kicad_sym",
      "footprint": "uc3844d.kicad_mod",
      "model_3d": "uc3844d-hero.glb",
      "model_3d_plain": "uc3844d.glb",
      "model_3d_step": "uc3844d-etched.step",
      "model_3d_step_plain": "uc3844d.step",
      "lbr": "uc3844d.lbr"
    },
    "distributor_links": {
      "lcsc": "C1530196",
      "digikey": "296-11292-5-ND",
      "mouser": "595-U3844D"
    },
    "distributor_check": {
      "checked_at": "2026-10-07T01:47:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-11292-5-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-U3844D",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier compensation pin connected to external compensation elements to modify error amplifier output; features internal current limiting and can be forced to GROUND for zero duty cycle control."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "3",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to internal error amplifier for voltage feedback control; typical 2.5V setpoint with maximum 2.55V input range."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "5",
        "name": "ISENSE",
        "type": "input",
        "description": "Current sensing input connected to current sensing resistor; PWM comparator uses this signal to terminate OUTPUT switch conduction with maximum 1V peak input and 3V/V gain."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "7",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Fixed frequency oscillator timing pin where timing resistor RRT connects to VREF and timing capacitor CCT connects to GROUND; frequency set by formula fOSC = 1.72/(RRT×CCT) with maximum 500kHz operation."
      },
      {
        "number": "8",
        "name": "PWRGND",
        "type": "power_in",
        "description": "Power ground return path providing ground reference for output gate driver stage."
      },
      {
        "number": "9",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog signal ground providing signal return path; serves as both power and analog ground where PWRGND is absent."
      },
      {
        "number": "10",
        "name": "OUTPUT",
        "type": "output",
        "description": "Gate driver output providing and sinking peak current up to 1A for direct MOSFET gate drive; actively held low when VCC is below turn-on threshold."
      },
      {
        "number": "11",
        "name": "VC",
        "type": "power_in",
        "description": "Bias power supply input for output gate driver stage; requires bypass capacitor at least 10 times larger than main switch FET gate capacitance."
      },
      {
        "number": "12",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply input operating from 12V to 28V with internal 34V clamp (30V absolute maximum from low impedance source); requires 0.1µF bypass capacitor to GROUND and additional bypass capacitor 10 times main switch FET gate capacitance."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "14",
        "name": "VREF",
        "type": "power_in",
        "description": "5V reference voltage output with ±2% accuracy providing error amplifier bias and oscillator charge current source up to ±20mA."
      }
    ],
    "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": 0.3619,
        "at": "2026-10-07T01:47:38"
      },
      "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
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          8.7,
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "sha256": "974eaab3dd251df2715fac10448bab97a9234124ca255c0bbd47220ed9f1b6b4",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-14",
      "Category": "Power Management (PMIC)",
      "Pins": "14"
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uc3844d"
  ],
  "discovery_pitch": "UC3844D (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "uc3844d.lbr",
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    "docs/uc3844d-datasheet.pdf",
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  "visibility": {
    "public": true
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}