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Ray Set visibility: public d571e66 3d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3843ap",
  "title": "UC3843AP",
  "brief": "UTC(Unisonic Tech) DC-DC Controllers, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power supply chip",
    "uc3843ap",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3843AP",
    "manufacturer": "UTC(Unisonic Tech)",
    "package": "DIP-8",
    "pin_count": 8,
    "category": "Power Supply Chip",
    "subcategory": "DC-DC Controllers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/21f580f4edd4a88032e95683e60472f3.pdf",
    "parts": {
      "symbol": "uc3843ap.kicad_sym",
      "footprint": "uc3843ap.kicad_mod",
      "model_3d": "uc3843ap-hero.glb",
      "model_3d_plain": "uc3843ap-etched.glb",
      "model_3d_step": "uc3843ap-etched.step",
      "model_3d_step_plain": "uc3843ap.step",
      "lbr": "uc3843ap.lbr"
    },
    "distributor_links": {
      "lcsc": "C2935494"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T12:12:45Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output for loop compensation, which can source or sink up to 0.5mA, and pulling it below two diode drops above ground shuts down the output."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Error amplifier inverting input (feedback) regulated against the 2.5V internal reference, with analog input range -0.3 to +6.3V."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Current sense comparator input where peak current is ISMAX=1.0V/Rs, with analog input range -0.3 to +6.3V and raising it above 1V shuts down the output."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing connection for the external RT and CT that set the frequency (52kHz typ. at RT=10kΩ, CT=3.3nF) with 1.7V peak-to-peak amplitude."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground, where timing and bypass capacitors should be connected close to this pin in a single-point ground."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "Totem-pole output driving a MOSFET directly with ±1A peak current, high impedance during UVLO so it should be shunted to GND with a bleeder resistor."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply input with 30V absolute maximum from a low impedance source, UVLO start threshold 8.4V typ. and minimum operating voltage 7.6V typ. for the UC3843A."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Internal trimmed 5V reference output (4.9 to 5.1V at 1mA) with short-circuit current of -100mA typ."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin configuration figure on page 2 gives only pin names as extracted text. Pins 1-6 are confirme; The pin types and the description of pin 4 (RT/CT as passive) are inferred from function. The datash"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0704,
        "at": "2026-10-23T12:12:31"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/21f580f4edd4a88032e95683e60472f3.pdf",
        "pages": 9,
        "sha256": "742f0c9d18996ac5",
        "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"
    },
    "models_3d": [
      {
        "file": "uc3843ap.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3843ap-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c102c1ae5cd2e59a047ca3140ffe0d6174cb2036843cfcae05164b1dd548ec17",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "UTC(Unisonic Tech)",
      "Package": "DIP-8",
      "Category": "Power Supply Chip",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "742f0c9d18996ac5d99251aab395f520cc95cbf18188820aeece3e6db1c4a10d",
      "rows": [
        {
          "name": "Reference Output Voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 4.9,
          "typ": 5,
          "max": 5.1,
          "conditions": "TJ=25°C, IOUT=1mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference Line Regulation",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 6,
          "max": 20,
          "conditions": "12≦VIN25V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference Load Regulation",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 15,
          "max": 35,
          "conditions": "1≦IOUT=20mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference Temperature Stability",
          "symbol": "",
          "kind": "temperature_coefficient",
          "unit": "mV/°C",
          "min": null,
          "typ": 0.2,
          "max": 0.4,
          "conditions": "Note 1",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total Output Variation",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 4.82,
          "typ": null,
          "max": 5.18,
          "conditions": "Line, Load, Temp (Note 1)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Noise Voltage",
          "symbol": "VOSC",
          "kind": "electrical",
          "unit": "μV",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "10Hz≦f≦10kHz, TJ=25°C (Note 1)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Long Term Stability",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 5,
          "max": 25,
          "conditions": "TA=25°C, 1000Hrs (Note 1)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Short Circuit",
          "symbol": "ISC",
          "kind": "electrical",
          "unit": "mA",
          "min": -30,
          "typ": -100,
          "max": -180,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Initial Accuracy",
          "symbol": "f",
          "kind": "electrical",
          "unit": "kHz",
          "min": 47,
          "typ": 52,
          "max": 57,
          "conditions": "TJ=25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Voltage Stability",
          "symbol": "f/VCC",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": 1,
          "conditions": "12≦VCC≦25V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Temperature Stability",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "TMIN≦TA≦TMAX (Note 1)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Amplitude",
          "symbol": "VOSC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.7,
          "max": null,
          "conditions": "VPIN4 peak to peak",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Input Voltage",
          "symbol": "VI(EA)",
          "kind": "electrical",
          "unit": "V",
          "min": 2.42,
          "typ": 2.5,
          "max": 2.58,
          "conditions": "VPIN1=2.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Input Bias Current",
          "symbol": "II(BIAS)",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": -0.3,
          "max": -2,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Open Loop Gain",
          "symbol": "AVOL",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 90,
          "max": null,
          "conditions": "2V ≦VOUT≦4V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Unity Gain Bandwidth",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": 0.7,
          "typ": 1,
          "max": null,
          "conditions": "TJ=25°C (Note 1)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp PSRR",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 70,
          "max": null,
          "conditions": "I2≦VCC≦25V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Output Sink Current",
          "symbol": "IO(SINK)",
          "kind": "electrical",
          "unit": "mA",
          "min": 2,
          "typ": 6,
          "max": null,
          "conditions": "VPIN2=2.7V,VPIN1=1.1V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Output Source Current",
          "symbol": "IO(SOURCE)",
          "kind": "electrical",
          "unit": "mA",
          "min": -0.5,
          "typ": -0.8,
          "max": null,
          "conditions": "VPIN2=2.3V,VPIN1=5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp VOUT High",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 5,
          "typ": 6,
          "max": null,
          "conditions": "VPIN2=2.3V, RL=15kΩ to GND",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amp VOUT Low",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.7,
          "max": 1.1,
          "conditions": "VPIN2=2.7V,VPIN1=1.1V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Current Sense Gain",
          "symbol": "GV",
          "kind": "electrical",
          "unit": "V/V",
          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "Note 2, 3",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current Sense Maximum Input Signal",
          "symbol": "VI(MAX)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "VPIN1=5V (Note 2)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current Sense PSRR",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 70,
          "max": null,
          "conditions": "12V≦VCC≦25V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current Sense Input Bias Current",
          "symbol": "IBIAS",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": -2,
          "max": -10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current Sense Delay to Output",
          "symbol": "",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 150,
          "max": 300,
          "conditions": "VPIN3=0 to 2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Low Level",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.1,
          "max": 0.4,
          "conditions": "IO(SINK)=20mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Low Level",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.5,
          "max": 2.2,
          "conditions": "IO(SINK)=200mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output High Level",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 13,
          "typ": 13.5,
          "max": null,
          "conditions": "IO(SOURCE)=20mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output High Level",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 12,
          "typ": 13.5,
          "max": null,
          "conditions": "IO(SOURCE)=200mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Rise Time",
          "symbol": "tR",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": 150,
          "conditions": "TJ=25°C, CL=1nF (Note 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Fall Time",
          "symbol": "tF",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": 150,
          "conditions": "TJ=25°C, CL=1nF (Note 1)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Start Threshold (3843A)",
          "symbol": "VTH(ST)",
          "kind": "electrical",
          "unit": "V",
          "min": 7.8,
          "typ": 8.4,
          "max": 9,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Min. Operating Voltage (3843A)",
          "symbol": "VOPR(MIN)",
          "kind": "electrical",
          "unit": "V",
          "min": 7,
          "typ": 7.6,
          "max": 8.2,
          "conditions": "After Turn On",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Duty Cycle Max",
          "symbol": "D(MAX)",
          "kind": "electrical",
          "unit": "%",
          "min": 95,
          "typ": 97,
          "max": 100,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Duty Cycle Min",
          "symbol": "D(MIN)",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 0,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Start-up Current",
          "symbol": "IST",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.12,
          "max": 0.3,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Operating Supply Current",
          "symbol": "ICC(OPR)",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 11,
          "max": 17,
          "conditions": "VPIN2=VPIN3=0V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VCC Zener Voltage",
          "symbol": "Vz",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 34,
          "max": null,
          "conditions": "ICC=25mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage (Low Impedance Source)",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "TA=25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Analog Inputs (Pin 2,3)",
          "symbol": "VI(ANA)",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6.3,
          "conditions": "TA=25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Current (Peak)",
          "symbol": "IO(PEAK)",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "TA=25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error Amplifier Output Sink Current",
          "symbol": "ISINK(EA)",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "TA=25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
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