UC3842BD1R2G

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3842bd1r2g",
  "title": "UC3842BD1R2G",
  "brief": "onsemi AC-DC Controllers and Regulators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "uc3842bd1r2g"
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  "component": {
    "mpn": "UC3842BD1R2G",
    "manufacturer": "onsemi",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/uc3842bd1r2-d.pdf",
    "parts": {
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      "footprint": "uc3842bd1r2g.kicad_mod",
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      "lbr": "uc3842bd1r2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C7114"
    },
    "pins": [
      {
        "number": "1",
        "name": "Compensation",
        "type": "output",
        "description": "Error amplifier output made available for loop compensation. External compensation network is tied between this pin and the Voltage Feedback input (pin 2)."
      },
      {
        "number": "2",
        "name": "Voltage Feedback",
        "type": "input",
        "description": "Inverting input of the error amplifier. Normally connected to the switching power supply output through a resistor divider; nominal reference at this node is 2.5 V."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Non-inverting input of the current-sense comparator. A voltage proportional to inductor/switch current is applied here; peak current-sense threshold is typically 1.0 V (max) for cycle-by-cycle limiting."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. An external resistor to Vref and a capacitor to ground set the oscillator frequency and maximum output duty cycle. Guaranteed oscillator frequency up to 250 kHz; operational to 500 kHz."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground and return for both control-signal and high-current output-driver return paths (single-ground SOIC-8 / PDIP-8 variant)."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "High-current totem-pole PWM gate-drive output for directly driving a power MOSFET. Rated 1.0 A source/sink; typical rise/fall times of 50 ns into 1.0 nF."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage for control logic and output driver. UC3842B UVLO turn-on at 16 V (typ) and turn-off at 10 V (typ); maximum rating 30 V. Internal 36 V zener clamp (ICC = 25 mA)."
      },
      {
        "number": "8",
        "name": "Vref",
        "type": "power_out",
        "description": "Trimmed and temperature-compensated 5.0 V reference output. Typically capable of sourcing 20 mA to external circuitry and provides the pull-up for the RT/CT oscillator resistor. Short-circuit current limited to approximately 85 mA (typ)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/uc3842bd1r2-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",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "f89339cabd01f9e47b36cee91668f69a5a7634d304e668f2002ca2be3ae36bb0",
        "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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    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "UC3842BD1R2G (onsemi) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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  "files": [
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  "variants": [
    {
      "mpn": "UC3842BD1R2G",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1R2GD1G",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1R2GN",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1R2GNG",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1R2GD",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1R2GDG",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1R2GDR2G",
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  ],
  "updated_at": "2026-09-25T13:30:01.100Z"
}