UC3843BD

{
  "slug": "uc3843bd",
  "version": "0.1.0",
  "type": "component",
  "description": "lingxingic AC-DC Controllers And Regulators, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3843bd",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3843bd.kicad_sym",
    "uc3843bd.kicad_mod",
    "uc3843bd.glb",
    "uc3843bd.step",
    "uc3843bd.lbr",
    "docs/hero.png",
    "docs/uc3843bd-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3843bd-hero.glb",
    "uc3843bd-hero.overlay.json",
    "uc3843bd-etched.glb"
  ],
  "component": {
    "mpn": "UC3843BD",
    "manufacturer": "lingxingic",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603345318721437696",
    "parts": {
      "symbol": "uc3843bd.kicad_sym",
      "footprint": "uc3843bd.kicad_mod",
      "model_3d": "uc3843bd-hero.glb",
      "model_3d_plain": "uc3843bd-etched.glb",
      "model_3d_step": "uc3843bd-etched.step",
      "model_3d_step_plain": "uc3843bd.step",
      "lbr": "uc3843bd.lbr"
    },
    "distributor_links": {
      "lcsc": "C22397221",
      "mouser": "863-UC3843BD"
    },
    "distributor_check": {
      "checked_at": "2026-10-16T05:17:52Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "863-UC3843BD",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "This pin is the Error Amplifier output and is made available for loop compensation."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "This is the inverting input of the Error Amplifier, normally connected to the switching power supply output through a resistor divider; analog inputs are rated -0.3 to +6.3 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "A voltage proportional to inductor current is connected to this input, and the PWM uses it to terminate the output switch conduction; analog inputs are rated -0.3 to +6.3 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "The oscillator frequency and maximum output duty cycle are programmed by resistor RT connected to VREF and capacitor CT connected to ground, with operation to 500 kHz possible."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "This pin is the combined control circuitry and power ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "This output directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1 A."
      },
      {
        "number": "7",
        "name": "Vi",
        "type": "power_in",
        "description": "This pin is the positive supply of the control IC; the absolute maximum supply voltage (low impedance source) is 30 V."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "This is the reference output that provides charging current for capacitor CT through resistor RT; its output voltage is 5.00 V typical at Io = 1 mA (4.90 to 5.10 V)."
      }
    ],
    "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 datasheet covers the UC384X family (UC3842/3/4/5) and does not print the MPN UC3843BD itself. Th; The SOP8 package drawing (page 8) is an image with no extractable text, so the pin numbering was tak; Pin 4 RT/CT is a timing node with a resistor and capacitor to other pins, so I typed it as passive. ",
          "1/8 pin names appear NOWHERE in the datasheet text: ['5:GROUND@p3']"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0427,
        "at": "2026-10-16T05:17:35"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603345318721437696",
        "pages": 9,
        "sha256": "56795483ff025b68",
        "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": "uc3843bd.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": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3843bd-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": "87215be1909b8c3a7e908aedbb0291820a4c53c570e4130eb286a4e041239f90",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}