UC2843M

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc2843m",
  "title": "UC2843M",
  "brief": "HGSEMI AC-DC Controllers and Regulators, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "uc2843m"
  ],
  "component": {
    "mpn": "UC2843M",
    "manufacturer": "HGSEMI",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2204181745_HGSEMI-UC2843M-TR_C2987344.pdf",
    "parts": {
      "symbol": "uc2843m.kicad_sym",
      "footprint": "uc2843m.kicad_mod",
      "model_3d": "uc2843m-etched.glb",
      "model_3d_plain": "uc2843m.glb",
      "model_3d_step": "uc2843m-etched.step",
      "model_3d_step_plain": "uc2843m.step",
      "lbr": "uc2843m.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error Amplifier output, brought out for loop compensation. External RC networks between COMP and VFB set the control-loop response."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the Error Amplifier (internal reference ~2.5V). Normally connected to the switching supply output through a resistor divider for output-voltage regulation."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Current-sense input. A voltage proportional to the switch/inductor current (from a sense resistor) is applied here; the PWM comparator terminates the output switch conduction when this pin reaches ~1.0V (internal 1V clamp)."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. Oscillator frequency and maximum duty cycle are set by an external resistor RT from VREF to this pin, and a capacitor CT from this pin to GND. Typical operation up to 500 kHz."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Combined control-circuitry and power ground return for the IC. Single-point ground for both signal path and the totem-pole output stage."
      },
      {
        "number": "6",
        "name": "OUT",
        "type": "output",
        "description": "High-current totem-pole gate-drive output. Directly drives the gate of an external power MOSFET; peak source/sink currents up to 1 A. VOH ~13.5V and VOL ~0.08V at 20 mA."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply for the IC. Absolute max 30V (or Zener-clamped ~38V). UC2843/45 UVLO turn-on ~8.4V, turn-off ~7.6V; operating ICC ~13 mA, startup ~0.17 mA."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5.0V (±2%) trimmed reference output. Sources bias/charging current for the timing capacitor CT via RT; short-circuit current limited to ~-100 mA (typ)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2204181745_HGSEMI-UC2843M-TR_C2987344.pdf",
        "pages": 12,
        "sha256": "b372c24e6b8779f6",
        "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "uc2843m.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc2843m-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "0fbdd1cdf8b20de0921b9bc85feda1a41c540d04a542432841b292d156615cbc",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "SOP-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uc2843m"
  ],
  "discovery_pitch": "UC2843M (HGSEMI) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc2843m.kicad_sym",
    "uc2843m.kicad_mod",
    "uc2843m.glb",
    "uc2843m.step",
    "uc2843m-etched.step",
    "uc2843m.lbr",
    "docs/hero.png",
    "docs/uc2843m-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "UC2843MM",
      "kind": "packaging"
    },
    {
      "mpn": "UC2843MM/TR",
      "kind": "packaging"
    },
    {
      "mpn": "UC2843MN",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T13:27:57.641Z"
}