UC3842BD1013TR

{
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  "type": "component",
  "slug": "uc3842bd1013tr",
  "title": "UC3842BD1013TR",
  "brief": "STMicroelectronics DC-DC Converters, SO-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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  "component": {
    "mpn": "UC3842BD1013TR",
    "manufacturer": "STMicroelectronics",
    "package": "SO-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/f02ad5bdd84749258a300c61a5d5e0e6.pdf",
    "parts": {
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      "lbr": "uc3842bd1013tr.lbr"
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    "distributor_links": {
      "lcsc": "C108537"
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output brought out for external loop compensation. Connect the feedback network (Zf) between this pin and VFB. Also serves as the PWM comparator control input via an internal 2R/R divider and 1.4 V level shift."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the internal error amplifier (non-inverting input tied to the 2.5 V reference). Normally connected to the switching supply output through a resistor divider to set the regulation point. Analog input rated -0.3 V to 5.5 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Current-sense input. A voltage proportional to inductor/switch current is applied here; when it reaches ~1.0 V the PWM latch terminates the output pulse for cycle-by-cycle current limiting. Analog input rated -0.3 V to 5.5 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing node. Connect a resistor RT from VREF (pin 8) to this pin and a timing capacitor CT from this pin to GND to program the oscillator frequency and maximum output duty cycle. Operation to 500 kHz is possible."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Combined control-circuitry and power (output-stage return) ground. All voltages in the datasheet are referenced to this pin; provide a single-point ground with timing/bypass capacitors returned here."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Totem-pole gate-drive output for an external N-channel power MOSFET. Sources and sinks peak currents up to 1 A (±1 A absolute max). Output is held low during UVLO. Typical VOH ≈ 13.5 V at 200 mA source; VOL ≈ 1.6 V at 200 mA sink. Rise/fall times ~50 ns into 1 nF."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply for the control IC (labeled Vi/VCC). Absolute maximum 30 V from a low-impedance source (self-limiting at ~36 V zener clamp with Ii<30 mA). UC3842B start threshold ~16 V, min operating voltage after turn-on ~10 V (UVLO hysteresis). Start-up current <0.5 mA; operating supply current ~12 mA typ."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Trimmed 5 V reference output (5.00 V typ, ±2% at 25 °C). Sources up to 50 mA (short-circuit current ~-100 mA typ). Provides charging current for the timing capacitor CT through the timing resistor RT connected to pin 4."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/f02ad5bdd84749258a300c61a5d5e0e6.pdf",
        "pages": 15,
        "sha256": "fedfd7362400f8b3",
        "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"
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    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
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      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
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        "seat": "z = 0",
        "extents_mm": [
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          4.9,
          1.75
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        "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": "uc3842bd1013tr-etched.step",
        "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,
        "footprint_binding": "identity",
        "sha256": "01158073e3a80d720bc757eb3bb46d7af21be47b8b1733901ab224cfdff0e0ee",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "SO-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "UC3842BD1013TR (STMicroelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
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  "files": [
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  "visibility": {
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  "variants": [
    {
      "mpn": "UC3842BD1013TR",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1013TRBN",
      "kind": "packaging"
    },
    {
      "mpn": "UC3842BD1013TRN",
      "kind": "packaging"
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  ],
  "updated_at": "2026-09-25T13:29:53.014Z"
}