UC3843AP

{
  "slug": "uc3843ap",
  "version": "0.1.0",
  "type": "component",
  "description": "UTC(Unisonic Tech) DC-DC Controllers, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power supply chip",
    "uc3843ap",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3843ap.kicad_sym",
    "uc3843ap.kicad_mod",
    "uc3843ap.glb",
    "uc3843ap.step",
    "uc3843ap.lbr",
    "docs/hero.png",
    "docs/uc3843ap-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3843ap-hero.glb",
    "uc3843ap-hero.overlay.json",
    "uc3843ap-etched.glb"
  ],
  "component": {
    "mpn": "UC3843AP",
    "manufacturer": "UTC(Unisonic Tech)",
    "package": "DIP-8",
    "pin_count": 8,
    "category": "Power Supply Chip",
    "subcategory": "DC-DC Controllers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/21f580f4edd4a88032e95683e60472f3.pdf",
    "parts": {
      "symbol": "uc3843ap.kicad_sym",
      "footprint": "uc3843ap.kicad_mod",
      "model_3d": "uc3843ap-hero.glb",
      "model_3d_plain": "uc3843ap-etched.glb",
      "model_3d_step": "uc3843ap-etched.step",
      "model_3d_step_plain": "uc3843ap.step",
      "lbr": "uc3843ap.lbr"
    },
    "distributor_links": {
      "lcsc": "C2935494"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T12:12:45Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output for loop compensation, which can source or sink up to 0.5mA, and pulling it below two diode drops above ground shuts down the output."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Error amplifier inverting input (feedback) regulated against the 2.5V internal reference, with analog input range -0.3 to +6.3V."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Current sense comparator input where peak current is ISMAX=1.0V/Rs, with analog input range -0.3 to +6.3V and raising it above 1V shuts down the output."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing connection for the external RT and CT that set the frequency (52kHz typ. at RT=10kΩ, CT=3.3nF) with 1.7V peak-to-peak amplitude."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground, where timing and bypass capacitors should be connected close to this pin in a single-point ground."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "Totem-pole output driving a MOSFET directly with ±1A peak current, high impedance during UVLO so it should be shunted to GND with a bleeder resistor."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply input with 30V absolute maximum from a low impedance source, UVLO start threshold 8.4V typ. and minimum operating voltage 7.6V typ. for the UC3843A."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Internal trimmed 5V reference output (4.9 to 5.1V at 1mA) with short-circuit current of -100mA typ."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin configuration figure on page 2 gives only pin names as extracted text. Pins 1-6 are confirme; The pin types and the description of pin 4 (RT/CT as passive) are inferred from function. The datash"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0704,
        "at": "2026-10-23T12:12:31"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/21f580f4edd4a88032e95683e60472f3.pdf",
        "pages": 9,
        "sha256": "742f0c9d18996ac5",
        "source_tier": "mfr"
      },
      "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": "uc3843ap.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3843ap-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c102c1ae5cd2e59a047ca3140ffe0d6174cb2036843cfcae05164b1dd548ec17",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}