main
Ray Set visibility: public a31a265 16d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3845bng",
  "title": "UC3845BNG",
  "brief": "onsemi AC-DC Controllers And Regulators, PDIP-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 management (pmic)",
    "uc3845bng",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3845BNG",
    "manufacturer": "onsemi",
    "package": "PDIP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588912911620452352",
    "parts": {
      "symbol": "uc3845bng.kicad_sym",
      "footprint": "uc3845bng.kicad_mod",
      "model_3d": "uc3845bng-hero.glb",
      "model_3d_plain": "uc3845bng-etched.glb",
      "model_3d_step": "uc3845bng-etched.step",
      "model_3d_step_plain": "uc3845bng.step",
      "lbr": "uc3845bng.lbr"
    },
    "distributor_links": {
      "lcsc": "C5292",
      "digikey": "UC3845BNGOS-ND",
      "mouser": "863-UC3845BNG"
    },
    "distributor_check": {
      "checked_at": "2026-10-15T05:58:55Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "UC3845BNGOS-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "863-UC3845BNG",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Compensation",
        "type": "output",
        "description": "Error Amplifier output, made available for loop compensation."
      },
      {
        "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."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Input for a voltage proportional to inductor current, which the PWM uses to terminate output switch conduction."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator frequency and maximum output duty cycle are set by resistor RT to Vref and capacitor CT to ground; oscillator operation to 1.0 kHz is possible."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Combined control circuitry and power ground."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A and switching at one-half the oscillator frequency."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply of the control IC."
      },
      {
        "number": "8",
        "name": "Vref",
        "type": "power_out",
        "description": "Reference output (5.0 V) that provides charging current for capacitor CT through resistor RT."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The 8-pin mapping is taken from the Pin Function Description table (8-pin column, page 6) and matche; Pin types for COMP, RT/CT and OUT are engineering judgments from the functional descriptions; the da; The datasheet's VFB bias-current figure is printed as '−2.0 A' (unit appears garbled, probably µA). "
        ],
        "pages_sent": 10,
        "cost_usd": 0.0668,
        "at": "2026-10-15T05:58:40"
      },
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        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588912911620452352",
        "pages": 19,
        "sha256": "e69ff39fc0ea9e08",
        "source_tier": "lcsc"
      },
      "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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        "up": "Z",
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        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-10-15",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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        "sha256": "59382a903ad432e337e3af47f5f2d0d53040b8f44ebd4e235fb8c7e5a405f80e",
        "checked": "2026-10-15",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "PDIP-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "e69ff39fc0ea9e08b6cc793079758f8b8c31ec7867bcd8b9b8e15e2b5d68bb6d",
      "rows": [
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          "name": "Total output variation over line, load and temperature (UC384xB)",
          "symbol": "Vref",
          "kind": "tolerance",
          "unit": "V",
          "min": 4.82,
          "typ": null,
          "max": 5.18,
          "conditions": "",
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          "name": "Reference output voltage",
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          "unit": "V",
          "min": 4.9,
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          "max": 5.1,
          "conditions": "IO = 1.0 mA, TJ = 25°C",
          "source_page": 2,
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          "typ": 8.4,
          "max": 9,
          "conditions": "UCX845B, BV",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Minimum operating voltage after turn-on (UCX845B, BV)",
          "symbol": "VCC(min)",
          "kind": "electrical",
          "unit": "V",
          "min": 7,
          "typ": 7.6,
          "max": 8.2,
          "conditions": "UCX845B, BV",
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        },
        {
          "name": "Maximum duty cycle (UC384XB)",
          "symbol": "DC(max)",
          "kind": "electrical",
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          "typ": 48,
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        {
          "name": "Discharge current, TJ = 25°C",
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          "typ": 8.3,
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          "conditions": "VOSC = 2.0 V, TJ = 25°C",
          "source_page": 3,
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          "typ": null,
          "max": 8.8,
          "conditions": "VOSC = 2.0 V, TA = Tlow to Thigh",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier voltage feedback input",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 2.42,
          "typ": 2.5,
          "max": 2.58,
          "conditions": "VO = 2.5 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Open loop voltage gain",
          "symbol": "AVOL",
          "kind": "electrical",
          "unit": "dB",
          "min": 65,
          "typ": 90,
          "max": null,
          "conditions": "VO = 2.0 V to 4.0 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Unity gain bandwidth",
          "symbol": "BW",
          "kind": "electrical",
          "unit": "MHz",
          "min": 0.7,
          "typ": 1,
          "max": null,
          "conditions": "TJ = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier power supply rejection ratio",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 70,
          "max": null,
          "conditions": "VCC = 12 V to 25 V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Current sense input voltage gain (UC384XB)",
          "symbol": "AV",
          "kind": "electrical",
          "unit": "V/V",
          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum current sense input threshold (UC384XB)",
          "symbol": "Vth",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "Note 9",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Current sense power supply rejection ratio",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 70,
          "max": null,
          "conditions": "VCC = 12 V to 25 V (Note 9)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Propagation delay, current sense input to output",
          "symbol": "tPLH(In/Out)",
          "kind": "timing",
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          "min": null,
          "typ": 150,
          "max": 300,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output voltage rise time",
          "symbol": "tr",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": 150,
          "conditions": "CL = 1.0 nF, TJ = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output voltage fall time",
          "symbol": "tf",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": 150,
          "conditions": "CL = 1.0 nF, TJ = 25°C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output voltage with UVLO activated",
          "symbol": "VOL(UVLO)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.1,
          "max": 1.1,
          "conditions": "VCC = 6.0 V, ISink = 1.0 mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power supply current, startup",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.3,
          "max": 0.5,
          "conditions": "VCC = 6.5 V for UCX845B",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Power supply current, operating",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 12,
          "max": 17,
          "conditions": "Note 11",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Power supply zener voltage",
          "symbol": "VZ",
          "kind": "electrical",
          "unit": "V",
          "min": 30,
          "typ": 36,
          "max": null,
          "conditions": "ICC = 25 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output short circuit current",
          "symbol": "ISC",
          "kind": "electrical",
          "unit": "mA",
          "min": -30,
          "typ": -85,
          "max": -180,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Line regulation",
          "symbol": "Regline",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 2,
          "max": 20,
          "conditions": "VCC = 12 V to 25 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Load regulation",
          "symbol": "Regload",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 3,
          "max": 25,
          "conditions": "IO = 1.0 mA to 20 mA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Temperature stability",
          "symbol": "TS",
          "kind": "electrical",
          "unit": "mV/°C",
          "min": null,
          "typ": 0.2,
          "max": null,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Output noise voltage",
          "symbol": "Vn",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "f = 10 Hz to 10 kHz, TJ = 25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Long term stability",
          "symbol": "S",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 5,
          "max": null,
          "conditions": "TA = 125°C for 1000 Hours",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Frequency change with voltage",
          "symbol": "fOSC/V",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": 1,
          "conditions": "VCC = 12 V to 25 V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Frequency change with temperature",
          "symbol": "fOSC/T",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.5,
          "max": null,
          "conditions": "TA = Tlow to Thigh",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Oscillator voltage swing (peak-to-peak)",
          "symbol": "VOSC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.6,
          "max": null,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: bias and driver voltages VCC, VC",
          "symbol": "VCC, VC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 36,
          "conditions": "Zero series impedance (Note 1)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: total power supply and zener current",
          "symbol": "ICC + IZ",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: output current, source or sink",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "Note 2",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: output energy (capacitive load per cycle)",
          "symbol": "W",
          "kind": "absolute_maximum",
          "unit": "J",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Capacitive load per cycle",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: current sense and voltage feedback inputs",
          "symbol": "Vin",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: error amp output sink current",
          "symbol": "IO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: operating junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Absolute max: storage temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating ambient temperature (UC3844B, UC3845B)",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": 0,
          "typ": null,
          "max": 70,
          "conditions": "UC3844B, UC3845B",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum power dissipation, PDIP-8 N suffix",
          "symbol": "PD",
          "kind": "thermal",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1.25,
          "conditions": "TA = 25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance, junction-to-air, PDIP-8 N suffix",
          "symbol": "RJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "Junction-to-air",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_pitch": "UC3845BNG (onsemi) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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