UC3843BD1013TR

{
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  "type": "component",
  "slug": "uc3843bd1013tr",
  "title": "UC3843BD1013TR",
  "brief": "STMicroelectronics AC-DC Controllers and Regulators, SO-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "UC3843BD1013TR",
    "manufacturer": "STMicroelectronics",
    "package": "SO-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/f02ad5bdd84749258a300c61a5d5e0e6.pdf",
    "parts": {
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      "lbr": "uc3843bd1013tr.lbr"
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    "distributor_links": {
      "lcsc": "C92746"
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error Amplifier output, made available for external loop compensation (typically an R-C network between COMP and VFB). Also serves as the input to the PWM comparator via an internal 2R:R divider and 1 V offset."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the internal Error Amplifier (non-inverting input tied to internal 2.50 V reference). Normally connected to the switching power supply output through a resistor divider for voltage-mode feedback. Input bias current typ -0.1 uA."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Current sense input. A voltage proportional to the switch/inductor current (typically from a source-side sense resistor) is applied here; the internal PWM current-sense comparator terminates the output switch conduction when this pin reaches ~1 V (max input signal 0.9-1.1 V, gain 3 V/V)."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. Connect timing resistor RT from VREF (pin 8) to this pin and timing capacitor CT from this pin to GROUND to program oscillator frequency and maximum duty cycle. Operation up to 500 kHz."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Combined control-circuitry and power ground return. All bypass, timing capacitors and current-sense components must be referenced to this pin via a single-point ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Totem-pole gate driver output for directly driving the gate of an external N-channel power MOSFET. Sources/sinks up to ±1 A peak; rise/fall time typ 50 ns into 1 nF; low in the off-state."
      },
      {
        "number": "7",
        "name": "Vi",
        "type": "power_in",
        "description": "Positive supply (VCC) of the control IC. Absolute maximum 30 V (self-limiting via internal 36 V zener at Ii<30 mA). UC3843B UVLO start threshold typ 8.5 V, minimum operating voltage after turn-on typ 7.6 V; operating supply current typ 12 mA."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Trimmed 5.00 V reference output (5 V ±2%, 50 mA capability). Supplies charging current to the timing capacitor CT via timing resistor RT and can be used to bias external circuitry. Short-circuit current typ -100 mA."
      }
    ],
    "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": {
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      "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",
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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)"
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      {
        "file": "uc3843bd1013tr-etched.step",
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        "origin": "footprint origin = pad-pattern centre",
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        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "7b9c4b3cc44a57b36d55b3f0e193cd0430aae641775d99051ec964e3a1ff7e0f",
        "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": "UC3843BD1013TR (STMicroelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "variants": [
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      "mpn": "UC3843BD1013TR",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BD1013TRN",
      "kind": "packaging"
    },
    {
      "mpn": "UC3843BD1013TRBN",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T13:30:42.382Z"
}