UC3845D8

{
  "slug": "uc3845d8",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments AC-DC Controllers And Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3845d8",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3845d8.kicad_sym",
    "uc3845d8.kicad_mod",
    "uc3845d8.glb",
    "uc3845d8.step",
    "uc3845d8.lbr",
    "docs/hero.png",
    "docs/uc3845d8-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3845d8-hero.glb",
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  "component": {
    "mpn": "UC3845D8",
    "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": "uc3845d8.kicad_sym",
      "footprint": "uc3845d8.kicad_mod",
      "model_3d": "uc3845d8-hero.glb",
      "model_3d_plain": "uc3845d8.glb",
      "model_3d_step": "uc3845d8-etched.step",
      "model_3d_step_plain": "uc3845d8.step",
      "lbr": "uc3845d8.lbr"
    },
    "distributor_links": {
      "lcsc": 2878346,
      "digikey": "2156-UC3845D8-ND",
      "mouser": "595-UC3845D8"
    },
    "distributor_check": {
      "checked_at": "2026-10-03T06:58:55Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-UC3845D8-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "595-UC3845D8",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier compensation pin for external compensation elements; internally current-limited, can be forced to GROUND to control zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to internal error amplifier for controlling power converter voltage feedback loop and stability."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary-side current sensing input connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction and can accept voltage ramp for voltage-mode control."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Timing pin for fixed-frequency oscillator; connect timing resistor RRT to VREF and timing capacitor CCT to GROUND to set switching frequency."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog ground serving as both power ground and signal return; for packages without separate PWRGND, serves dual function as power and analog ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Gate driver output for external MOSFET; provides and sinks peak current up to 1A; actively held low when VCC is below turn-on threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Analog controller bias supply input; total current is static current plus average OUTPUT current; requires 0.1µF bypass capacitor directly to GROUND with minimum wiring length."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_in",
        "description": "5V precision reference voltage output; provides charging current to oscillator timing capacitor through timing resistor; requires 0.1µF ceramic bypass capacitor to GROUND for 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": 0.3435,
        "at": "2026-10-03T06:58:35"
      },
      "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"
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  }
}