main
Ray Set visibility: public 6fc7739 6h ago
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791
{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3845b-hxy",
  "title": "UC3845B-HXY",
  "brief": "HXY MOSFET AC-DC Controllers & Regulators, SOP-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",
    "uc3845b-hxy",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3845B-HXY",
    "manufacturer": "HXY MOSFET",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Supply Chip",
    "subcategory": "AC-DC Controllers & Regulators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a8c3514e16e3b292d2456de1f5645cc5.pdf",
    "parts": {
      "symbol": "uc3845b-hxy.kicad_sym",
      "footprint": "uc3845b-hxy.kicad_mod",
      "model_3d": "uc3845b-hxy-hero.glb",
      "model_3d_plain": "uc3845b-hxy-etched.glb",
      "model_3d_step": "uc3845b-hxy-etched.step",
      "model_3d_step_plain": "uc3845b-hxy.step",
      "lbr": "uc3845b-hxy.lbr"
    },
    "distributor_links": {
      "lcsc": "C18198398"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T01:11:10Z",
      "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": "Output of the error amplifier, which can be used for loop compensation."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input of the error amplifier, normally driven through a resistor divider from the switching power supply output."
      },
      {
        "number": "3",
        "name": "SENSE",
        "type": "input",
        "description": "Input for a voltage proportional to the sensor current, which the PWM uses to terminate output switch conduction; absolute maximum range is -0.3 V to 5.5 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Timing pin where RT connected to Vref and CT connected to ground set the oscillator frequency and maximum output duty cycle, with operation up to 1.0 MHz."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin for the controller."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Directly drives the power MOSFET gate with up to 1.0 A peak source and sink current, at half the oscillator frequency."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply pin for the control IC; absolute maximum supply voltage is 30 V."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5.0 V reference output that supplies the charging current through RT to CT and can source more than 20 mA to external circuits."
      }
    ],
    "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": null,
        "consensus": "skipped (clean text read)",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 12,
        "cost_usd": 0.0008,
        "at": "2026-10-27T01:10:35"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/a8c3514e16e3b292d2456de1f5645cc5.pdf",
        "pages": 12,
        "sha256": "e1410c549d244d35",
        "source_tier": "lcsc"
      },
      "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": "uc3845b-hxy.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3845b-hxy-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c3a37e308bb23e8f41d74fb5cfbe5086a6649884c1d53c96b31db48e2250b89f",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HXY MOSFET",
      "Package": "SOP-8",
      "Category": "Power Supply Chip",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "e1410c549d244d35580230803cd3ae626c426eeb2832c06e0046eaeaa41eb652",
      "rows": [
        {
          "name": "Supply voltage",
          "symbol": "Vcc",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "Absolute maximum, Tamb=25℃ unless otherwise specified",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output current source or sink",
          "symbol": "Io",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "Note 1",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Current sense and voltage feedback input voltage",
          "symbol": "Vin",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output sink current",
          "symbol": "Io",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output energy per cycle with capacitive load",
          "symbol": "W",
          "kind": "absolute_maximum",
          "unit": "uJ",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating ambient temperature",
          "symbol": "Tamb",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": 0,
          "typ": null,
          "max": 70,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference output voltage",
          "symbol": "Vref",
          "kind": "electrical",
          "unit": "V",
          "min": 4.9,
          "typ": 5,
          "max": 5.1,
          "conditions": "Tj=25℃ Io=1mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference line regulation",
          "symbol": "ΔVref",
          "kind": "electrical",
          "unit": "mV",
          "min": 2,
          "typ": null,
          "max": 20,
          "conditions": "12V≤Vi≤25V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference load regulation",
          "symbol": "ΔVref",
          "kind": "electrical",
          "unit": "mV",
          "min": 3,
          "typ": null,
          "max": 25,
          "conditions": "1mA≤Vi≤20mA",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference short-circuit output current",
          "symbol": "Isc",
          "kind": "electrical",
          "unit": "mA",
          "min": -30,
          "typ": -85,
          "max": -180,
          "conditions": "Ta=25℃",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillation frequency",
          "symbol": "fosc",
          "kind": "electrical",
          "unit": "kHz",
          "min": 47,
          "typ": 52,
          "max": 57,
          "conditions": "Ta=25℃",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator frequency voltage variation",
          "symbol": "Δfosc/ΔV",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": 1,
          "conditions": "Vcc=12V to 25V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input voltage",
          "symbol": "Vfb",
          "kind": "electrical",
          "unit": "V",
          "min": 2.42,
          "typ": 2.5,
          "max": 2.58,
          "conditions": "Vo=2.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input bias current",
          "symbol": "Iib",
          "kind": "electrical",
          "unit": "μA",
          "min": -0.1,
          "typ": null,
          "max": -2,
          "conditions": "Vfb=2.7V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier open-loop voltage gain",
          "symbol": "Gvol",
          "kind": "electrical",
          "unit": "dB",
          "min": 65,
          "typ": null,
          "max": 90,
          "conditions": "2V≤Vo≤4V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier unity gain bandwidth",
          "symbol": "BW",
          "kind": "electrical",
          "unit": "MHz",
          "min": 0.7,
          "typ": null,
          "max": 1,
          "conditions": "Tj=25℃",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier power supply rejection ratio",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": null,
          "max": 70,
          "conditions": "12V≤Vi≤25V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output sink current",
          "symbol": "Isink",
          "kind": "electrical",
          "unit": "mA",
          "min": 2,
          "typ": null,
          "max": 6,
          "conditions": "Vfb=2.7V,Vo=1.1V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output source current",
          "symbol": "Isource",
          "kind": "electrical",
          "unit": "mA",
          "min": -0.5,
          "typ": null,
          "max": -1,
          "conditions": "Vfb=2.3V,Vo=5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output high level",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 6,
          "typ": null,
          "max": 7,
          "conditions": "Vfb=2.3V,Rl=15kΩ to Ground",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier output low level",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": 0.8,
          "typ": null,
          "max": 1.1,
          "conditions": "Vo=2.7V,Rl=15kΩ to Vref",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Voltage sense input voltage gain",
          "symbol": "Av",
          "kind": "electrical",
          "unit": "V/V",
          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "注4 & 5",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum current sense input threshold",
          "symbol": "Vth",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "注4",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current sense power supply rejection ratio",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 70,
          "max": null,
          "conditions": "12V≤Vcc≤25V 注4",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current sense input bias current",
          "symbol": "Iib",
          "kind": "electrical",
          "unit": "μA",
          "min": -2,
          "typ": null,
          "max": -10,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Current sense input to output propagation delay",
          "symbol": "TPLH(in/off)",
          "kind": "electrical",
          "unit": "ns",
          "min": 150,
          "typ": null,
          "max": 300,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output low level",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": 0.1,
          "typ": null,
          "max": 0.4,
          "conditions": "Isink=20mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output low level",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 2.2,
          "conditions": "Isink=200mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output high level",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 13,
          "typ": null,
          "max": 13.5,
          "conditions": "Isource=20mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output high level",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 12,
          "typ": null,
          "max": 13.4,
          "conditions": "Isource=200mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output voltage under UVLO",
          "symbol": "Vol(uvlo)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.1,
          "typ": null,
          "max": 1.1,
          "conditions": "Vcc=6V,Isink=1mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output voltage rise time",
          "symbol": "tr",
          "kind": "timing",
          "unit": "ns",
          "min": 50,
          "typ": null,
          "max": 150,
          "conditions": "Tj=25℃ Cl=1nF",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output voltage fall time",
          "symbol": "tf",
          "kind": "timing",
          "unit": "ns",
          "min": 50,
          "typ": null,
          "max": 150,
          "conditions": "Tj=25℃ Cl=1nF",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Undervoltage lockout start threshold",
          "symbol": "Vth",
          "kind": "electrical",
          "unit": "V",
          "min": 7.8,
          "typ": 8.2,
          "max": 9,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Undervoltage lockout minimum operating voltage",
          "symbol": "Vcc(min)",
          "kind": "electrical",
          "unit": "V",
          "min": 7,
          "typ": 7.6,
          "max": 8.2,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Maximum duty cycle",
          "symbol": "DCmax",
          "kind": "electrical",
          "unit": "%",
          "min": 47,
          "typ": 48,
          "max": 50,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Minimum duty cycle",
          "symbol": "DCmin",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Start-up current",
          "symbol": "Istart",
          "kind": "electrical",
          "unit": "mA",
          "min": 0.12,
          "typ": null,
          "max": 1,
          "conditions": "Vcc=6.5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Operating supply current",
          "symbol": "Icc",
          "kind": "electrical",
          "unit": "mA",
          "min": 11,
          "typ": null,
          "max": 17,
          "conditions": "Vcc=15V (注2)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Zener voltage",
          "symbol": "Vz",
          "kind": "electrical",
          "unit": "V",
          "min": 30,
          "typ": null,
          "max": 36,
          "conditions": "Icc=25mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Oscillator temperature characteristic",
          "symbol": "Δfosc/ΔT",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 5,
          "max": null,
          "conditions": "Ta=Tlow to Thigh",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator peak-to-peak amplitude",
          "symbol": "Vosc",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.6,
          "max": null,
          "conditions": "peak to peak",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Oscillator discharge current",
          "symbol": "Idischg",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 10.8,
          "max": null,
          "conditions": "Vosc=2V,Tj=25℃",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference output noise voltage",
          "symbol": "Vn",
          "kind": "electrical",
          "unit": "μV",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "10Hz≤f≤10kHz",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "uc3845b-hxy"
  ],
  "discovery_pitch": "UC3845B-HXY (HXY MOSFET) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3845b-hxy.kicad_sym",
    "uc3845b-hxy.kicad_mod",
    "uc3845b-hxy.glb",
    "uc3845b-hxy.step",
    "uc3845b-hxy.lbr",
    "docs/hero.png",
    "docs/uc3845b-hxy-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3845b-hxy-hero.glb",
    "uc3845b-hxy-hero.overlay.json",
    "uc3845b-hxy-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}