UC3844D8TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3844d8tr",
  "title": "UC3844D8TR",
  "brief": "Texas Instruments AC-DC Controllers And Regulators, SOIC-8. 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)",
    "uc3844d8tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3844D8TR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/cn/lit/gpn/uc3842",
    "parts": {
      "symbol": "uc3844d8tr.kicad_sym",
      "footprint": "uc3844d8tr.kicad_mod",
      "model_3d": "uc3844d8tr-hero.glb",
      "model_3d_plain": "uc3844d8tr.glb",
      "model_3d_step": "uc3844d8tr-etched.step",
      "model_3d_step_plain": "uc3844d8tr.step",
      "lbr": "uc3844d8tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2657919",
      "digikey": "296-47907-2-ND",
      "mouser": "595-UC3844D8TR"
    },
    "distributor_check": {
      "checked_at": "2026-10-07T08:32:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-47907-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UC3844D8TR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier compensation pin. Connect external compensation elements to modify error amplifier output; internal current limiting allows forcing COMP to GROUND externally to control zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of internal error amplifier used to control power converter voltage feedback loop for stability."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary side current sensing pin connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction; voltage ramp can be applied for voltage mode control configuration."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Fixed frequency oscillator setting point; timing resistor RRT connects from this pin to VREF and timing capacitor CCT connects to GROUND to set switching frequency; keep timing capacitor leads as short as possible and directly connected to device GROUND."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog ground. For device packages without PWRGND, GROUND serves as both power ground and analog ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Gate driver for external MOSFET; on-chip driver output designed to directly drive MOSFET with peak current up to 1A sourced and sunk; actively held low when VCC is below turn-on threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Analog controller bias input for powering the device; total VCC current equals static VCC current plus average OUTPUT current; requires 0.1µF bypass capacitor directly connected to GROUND with minimal trace length."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_in",
        "description": "5V reference voltage providing charging current to oscillator timing capacitor through timing resistor; bypass to ground with ceramic capacitor placed close to pin connection; minimum 0.1µF ceramic capacitor required for reference stability."
      }
    ],
    "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": 0.3092,
        "at": "2026-10-07T08:31:55"
      },
      "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": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "uc3844d8tr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3844d8tr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "a26ba12ab755a64984ba8801e771d7316cf8587a9f5e16beec4de7f6b104bcbd",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uc3844d8tr"
  ],
  "discovery_pitch": "UC3844D8TR (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": [
    "page.json",
    "README.md",
    "uc3844d8tr.kicad_sym",
    "uc3844d8tr.kicad_mod",
    "uc3844d8tr.glb",
    "uc3844d8tr.step",
    "uc3844d8tr.lbr",
    "docs/hero.png",
    "docs/uc3844d8tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3844d8tr-hero.glb",
    "uc3844d8tr-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}