UC3843BVD1R2G

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3843bvd1r2g",
  "title": "UC3843BVD1R2G",
  "brief": "onsemi DC-DC Converters, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "uc3843bvd1r2g"
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  "component": {
    "mpn": "UC3843BVD1R2G",
    "manufacturer": "onsemi",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/uc3843bvd1r2-d.pdf",
    "parts": {
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      "footprint": "uc3843bvd1r2g.kicad_mod",
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      "lbr": "uc3843bvd1r2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C231572"
    },
    "pins": [
      {
        "number": "1",
        "name": "Compensation",
        "type": "output",
        "description": "Error Amplifier output, made available for external loop compensation. Voltage on this pin sets the peak inductor current (Ipk = (V_pin1 − 1.4 V) / (3·Rs)); internally clamped to ~1.0 V during overload."
      },
      {
        "number": "2",
        "name": "Voltage Feedback",
        "type": "input",
        "description": "Inverting input of the Error Amplifier. Normally connected to the switching supply output through a resistor divider; the non-inverting input is internally biased to 2.5 V. Input bias current is typically −0.1 µA (max −2.0 µA)."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Current-sense input; a voltage proportional to inductor current is applied here. The PWM uses this information to terminate output switch conduction on a cycle-by-cycle basis. Maximum input threshold typically 1.0 V; current sense gain Av ≈ 3.0 V/V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. The oscillator frequency and maximum duty cycle are programmed by connecting timing resistor RT from Vref to this pin and capacitor CT from this pin to ground. Operation to 500 kHz is possible; sawtooth swings between ~1.2 V (valley) and ~2.8 V (peak)."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Combined control-circuitry and power ground return for the 8-pin package. All internal grounds and the output stage return through this pin."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "High-current totem-pole gate-drive output for driving a power MOSFET. Peak source/sink currents up to 1.0 A; rise/fall times ~50 ns typical into 1 nF. Output is held low when UVLO is active."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply of the control IC. UC3843B startup threshold 8.4 V typ (7.8-9.0 V), min operating voltage after turn-on 7.6 V typ. Absolute maximum 30 V; internal zener clamps at 36 V typ."
      },
      {
        "number": "8",
        "name": "Vref",
        "type": "power_out",
        "description": "5.0 V trimmed reference output (typ 5.0 V, ±1% at TJ = 25°C, IO = 1 mA). Provides charging current for CT through RT and can source up to ~50 mA to external loads; short-circuit current limited to ~85 mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/uc3843bvd1r2-d.pdf",
        "pages": 22,
        "sha256": "581ae31fbd1f3e07",
        "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"
    },
    "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"
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "979b24431dc1d9e792c474ec85e08c1f6f0ad8d40001de52dfd20e87caa3a47c",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
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    "readme",
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  "discovery_triggers": [
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  "discovery_pitch": "UC3843BVD1R2G (onsemi) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
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    "path": "docs/hero.png"
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  "files": [
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    "uc3843bvd1r2g.step",
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  "visibility": {
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  "variants": [
    {
      "mpn": "UC3843BVD1R2G",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GD1G",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GN",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GNG",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GD",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GDG",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GDR2",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BVD1R2GDR2G",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T13:31:31.788Z"
}