UC3842BD

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3842bd",
  "title": "UC3842BD",
  "brief": "COSINE AC-DC Controllers And Regulators, SOP-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)",
    "uc3842bd",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3842BD",
    "manufacturer": "COSINE",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603380585087705088",
    "parts": {
      "symbol": "uc3842bd.kicad_sym",
      "footprint": "uc3842bd.kicad_mod",
      "model_3d": "uc3842bd-etched.glb",
      "model_3d_plain": "uc3842bd.glb",
      "model_3d_step": "uc3842bd-etched.step",
      "model_3d_step_plain": "uc3842bd.step",
      "lbr": "uc3842bd.lbr"
    },
    "distributor_links": {
      "lcsc": "C22458872"
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Output of error amplifier for compensation; connect external compensation components to this pin or externally force to GROUND to command zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to error amplifier, normally connected to switching power supply output through resistor divider."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Input for voltage proportional to inductor current to terminate output switch conduction; voltage ramp can be applied for voltage-mode control configuration."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Program oscillator frequency and maximum output duty cycle by connecting resistor RT to VREF and capacitor CT to ground; operation up to 1 MHz is possible."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Ground return pin functioning as both power ground and analog ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Output of on-chip drive stage directly driving power MOSFET gate with peak current up to 1 A sourced and sunk; output is actively held low when VCC is below turnon threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply pin for control IC (7.6 V to 30 V); bypass with 0.1 µF ceramic low ESL capacitor with minimal trace lengths and additional bypass capacitor at least 10 times greater than gate capacitance of main switching MOSFET."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_in",
        "description": "5 V reference providing charging current for capacitor CT through resistor RT; bypass with 0.1 µF ceramic low ESL capacitor with minimal trace length to ground plane."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "1/8 pin names appear NOWHERE in the datasheet text: ['5:GROUND@p2']"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0992,
        "at": "2026-09-21T23:35:28"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603380585087705088",
        "pages": 10,
        "sha256": "60a0f42408f6f9e3",
        "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": "uc3842bd.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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3842bd-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": "f940e7fb729553b40a14360ed42f26a4be250b085073cd86176eedc4aa036423",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "COSINE",
      "Package": "SOP-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uc3842bd"
  ],
  "discovery_pitch": "UC3842BD (COSINE) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3842bd.kicad_sym",
    "uc3842bd.kicad_mod",
    "uc3842bd.glb",
    "uc3842bd.step",
    "uc3842bd.lbr",
    "docs/hero.png",
    "docs/uc3842bd-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T13:29:44.815Z"
}