UC1843AMDREP

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  "type": "component",
  "slug": "uc1843amdrep",
  "title": "UC1843AMDREP",
  "brief": "Texas Instruments AC-DC Controllers and Regulators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "UC1843AMDREP",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2303021030_Texas-Instruments-UC1843AMDREP_C702394.pdf",
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    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output / compensation node. Connect frequency-compensation network between this pin and VFB. Also serves as the control-loop input to the PWM comparator."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to the error amplifier. Normally connected via a resistor divider to the converter output; the non-inverting input is internally tied to the 2.50 V reference. Absolute max input range -0.3 V to 6.3 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Current-sense input to the PWM current-sense comparator. Internal 1 V clamp provides pulse-by-pulse current limiting. Typical gain 3 V/V; input bias current ~-2 uA; absolute max range -0.3 V to 6.3 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. Connect a timing resistor from VREF to RT/CT and a timing capacitor from RT/CT to GND to set the switching frequency (up to 500 kHz). Oscillator discharge current trimmed to ~8.3 mA."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground / power ground return. All internal reference voltages are referenced to this pin."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "High-current totem-pole gate-drive output for driving an external power MOSFET. Rated for +/-1 A peak; typical rise/fall time 50 ns into 1 nF load; high-level output 13.5 V typical with 20 mA source."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input for the IC and output driver. UVLO start threshold 8.4 V typ, turn-off 7.6 V typ (UC1843A). Low start-up current <0.5 mA. Internal 34 V zener clamp; absolute max low-impedance source 30 V."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Trimmed 5.0 V internal bandgap reference output, capable of sourcing up to 50 mA. Typically used to bias the oscillator timing network and external circuitry."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2303021030_Texas-Instruments-UC1843AMDREP_C702394.pdf",
        "pages": 17,
        "sha256": "53c59033a3dd0a96",
        "source_tier": "lcsc"
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      "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"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "variants": [
    {
      "mpn": "UC1843AMDREP",
      "kind": "packaging"
    }
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  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "UC1843AMDREP (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "visibility": {
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  "updated_at": "2026-09-25T13:26:43.687Z"
}