UC3843N

{
  "slug": "uc3843n",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments AC-DC Controllers And Regulators, PDIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3843n",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3843n.kicad_sym",
    "uc3843n.kicad_mod",
    "uc3843n.glb",
    "uc3843n.step",
    "uc3843n.lbr",
    "docs/hero.png",
    "docs/uc3843n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3843n-hero.glb",
    "uc3843n-hero.overlay.json",
    "uc3843n-etched.glb"
  ],
  "component": {
    "mpn": "UC3843N",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/uc3843.pdf",
    "parts": {
      "symbol": "uc3843n.kicad_sym",
      "footprint": "uc3843n.kicad_mod",
      "model_3d": "uc3843n-hero.glb",
      "model_3d_plain": "uc3843n-etched.glb",
      "model_3d_step": "uc3843n-etched.step",
      "model_3d_step_plain": "uc3843n.step",
      "lbr": "uc3843n.lbr"
    },
    "distributor_links": {
      "lcsc": "C1530280",
      "digikey": "296-11288-5-ND",
      "mouser": "595-UC3843N"
    },
    "distributor_check": {
      "checked_at": "2026-11-06T02:04:11Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-11288-5-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-UC3843N",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier compensation pin for connecting external compensation components to modify the error amplifier output, and the error amplifier is internally current-limited so zero duty cycle can be commanded by externally forcing COMP to GROUND."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to the internal error amplifier, used to control the power converter voltage-feedback loop for stability."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary-side current sense input connected to the current sensing resistor, used by the PWM to terminate OUTPUT switch conduction, with a typical current sense amplifier gain of 3 V/V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Fixed-frequency oscillator set point with timing resistor RRT connected to VREF and timing capacitor CCT connected to GROUND, and timing resistor values must never be less than 5 kΩ."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog and power ground return for the device, and TI recommends separating the signal return path from the high-current gate driver path."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Gate drive output for directly driving an external MOSFET, sourcing and sinking peak currents of up to 1 A and actively held low when VCC is below the turnon threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Analog controller bias supply input, with quiescent VCC current of 0.5 mA, a VCC clamp of 34 V typical, and an absolute maximum of 30 V from a low-impedance source."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5-V reference voltage output that requires a minimum 0.1-µF ceramic bypass capacitor to GROUND placed close to the pin, with an output short-circuit current of 30 mA."
      }
    ],
    "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": [],
        "pages_sent": 22,
        "cost_usd": 0.0348,
        "at": "2026-11-06T02:02:48"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/uc3843.pdf",
        "pages": 63,
        "sha256": "9452e59764ebb79a",
        "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": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
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        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-11-06",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3843n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
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        "checked": "2026-11-06",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}