UC3845G-S08-R

{
  "slug": "uc3845g-s08-r",
  "version": "0.1.0",
  "type": "component",
  "description": "UTC Unisonic Tech 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)",
    "uc3845g-s08-r",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3845g-s08-r.kicad_sym",
    "uc3845g-s08-r.kicad_mod",
    "uc3845g-s08-r.glb",
    "uc3845g-s08-r.step",
    "uc3845g-s08-r.lbr",
    "docs/hero.png",
    "docs/uc3845g-s08-r-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3845g-s08-r-hero.glb",
    "uc3845g-s08-r-hero.overlay.json",
    "uc3845g-s08-r-etched.glb"
  ],
  "component": {
    "mpn": "UC3845G-S08-R",
    "manufacturer": "UTC Unisonic Tech",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175462146392064",
    "parts": {
      "symbol": "uc3845g-s08-r.kicad_sym",
      "footprint": "uc3845g-s08-r.kicad_mod",
      "model_3d": "uc3845g-s08-r-hero.glb",
      "model_3d_plain": "uc3845g-s08-r-etched.glb",
      "model_3d_step": "uc3845g-s08-r-etched.step",
      "model_3d_step_plain": "uc3845g-s08-r.step",
      "lbr": "uc3845g-s08-r.lbr"
    },
    "distributor_links": {
      "lcsc": "C71115"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T03:10:47Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Compensation",
        "type": "output",
        "description": "Error amplifier output, made available for loop compensation."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Voltage feedback input, the inverting input of the error amplifier, normally connected to the switching supply output through a resistor divider."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Input for a voltage proportional to inductor current, used by the PWM to terminate output switch conduction (current sense input threshold 1.0 V typ., 0.9 V min., 1.1 V max.)."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin: resistor RT connects to Vref and capacitor CT to ground to set oscillator frequency and maximum duty cycle; operation to 1 MHz is possible."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Power ground."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1 A; the output switches at one-half the oscillator frequency."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input (UC3845 undervoltage lockout: startup threshold 8.4 V typ., minimum operating voltage 7.6 V typ. after turn-on)."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Reference output providing 5.0 V typ. (4.82 V to 5.18 V total variation) and charging current for timing capacitor CT through resistor RT."
      }
    ],
    "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: The UC3845G-S08-R is the SOP-8 Tape Reel variant (ordering table, page 1). The pin configuration dra; Pin types are not stated in the datasheet and were assigned by function: Compensation as output (err; Pin descriptions include limits quoted from the electrical characteristics table (UVLO thresholds fo"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0391,
        "at": "2026-10-18T03:08:38"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175462146392064",
        "pages": 7,
        "sha256": "43d85764f509307f",
        "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": "uc3845g-s08-r.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3845g-s08-r-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "2cda52f6cf1601bdefc13dc7f55f34bb4cf475cad2bd80f3020bbcde1000b8bc",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}