UC3845D8TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3845d8tr",
  "title": "UC3845D8TR",
  "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)",
    "uc3845d8tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3845D8TR",
    "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/uc2843",
    "parts": {
      "symbol": "uc3845d8tr.kicad_sym",
      "footprint": "uc3845d8tr.kicad_mod",
      "model_3d": "uc3845d8tr-hero.glb",
      "model_3d_plain": "uc3845d8tr.glb",
      "model_3d_step": "uc3845d8tr-etched.step",
      "model_3d_step_plain": "uc3845d8tr.step",
      "lbr": "uc3845d8tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C523771",
      "digikey": "296-38313-2-ND",
      "mouser": "595-UC3845D8TR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T03:21:15Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-38313-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UC3845D8TR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output and compensation pin; the open-collector error amplifier has internal current limiting, so COMP can be forced to GROUND to obtain zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the internal error amplifier used for voltage feedback loop control; keep the VFB trace as short as possible with minimal stray capacitance for stability."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary-side current sense input to the PWM comparator that terminates OUTPUT conduction; the typical ISENSE voltage is 1 V, with a maximum input voltage of 1 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Oscillator timing pin: RT connects from VREF and CT to GROUND to set the switching frequency via fOSC = 1.72/(RT x CT), and RT must never be smaller than 5 kΩ."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Combined signal (analog) and power ground for this 8-pin package, which has no separate PWRGND pin; keep the timing capacitor and bypass returns on a single point ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Totem-pole gate driver output that drives the external MOSFET directly, sourcing and sinking peak current up to 1 A, and held low when VCC is below the turn-on threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply input for the controller, with recommended supply voltage 12 V to 28 V, absolute maximum 30 V from a low-impedance source, and a bypass capacitor of typically 0.1 µF to GROUND placed close to the pin."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5 V reference output that must be bypassed to GROUND with a ceramic capacitor of at least 0.1 µF placed close to the pin, and external loads on VREF require additional bypassing."
      }
    ],
    "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: Pin numbers, names and the 8-pin assignment come from the Table 5-1 column for SOIC/CDIP/PDIP (8) an; The datasheet lists VCC as type I and VREF as type O. I mapped VCC to power_in and VREF to power_out; The datasheet lists COMP as type O, but the pin also sinks and sources current and is used as a feed"
        ],
        "pages_sent": 38,
        "cost_usd": 0.2239,
        "at": "2026-10-08T03:20:58"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/uc2843",
        "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": [
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        "file": "uc3845d8tr.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": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3845d8tr-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": "f5b635d088b20327144aa3e72a0de28770ec8e0ad6c9090989338f0b3f86ef9b",
        "checked": "2026-10-08",
        "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"
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  "discovery_triggers": [
    "uc3845d8tr"
  ],
  "discovery_pitch": "UC3845D8TR (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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    "README.md",
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    "uc3845d8tr.step",
    "uc3845d8tr.lbr",
    "docs/hero.png",
    "docs/uc3845d8tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3845d8tr-hero.glb",
    "uc3845d8tr-hero.overlay.json"
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  "visibility": {
    "public": true
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}