UC3842BL-S08-R

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc3842bl-s08-r",
  "title": "UC3842BL-S08-R",
  "brief": "UTC Unisonic Tech AC-DC Controllers And Regulators, SOIC-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)",
    "uc3842bl-s08-r",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "UC3842BL-S08-R",
    "manufacturer": "UTC Unisonic Tech",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175230138601472",
    "parts": {
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      "model_3d_step_plain": "uc3842bl-s08-r.step",
      "lbr": "uc3842bl-s08-r.lbr"
    },
    "distributor_links": {
      "lcsc": "C75524"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T21:12:17Z",
      "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 that provides loop compensation to maintain VFB at 2.5V."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Error amplifier inverting input; the non-inverting input is the internal 2.5V bandgap reference."
      },
      {
        "number": "3",
        "name": "CS",
        "type": "input",
        "description": "Current sense input to the PWM control gate drive of the output; raising it above 1V shuts down the output, and the Current Sense and Voltage Feedback inputs are rated -0.3 V to +5.5 V."
      },
      {
        "number": "4",
        "name": "RTCT",
        "type": "input",
        "description": "Sets the oscillator frequency and the maximum output duty cycle through the RT and CT timing components."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Power ground; the timing and bypass capacitors must be connected to this pin at a single close point."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Drives the power MOSFET directly; the datasheet recommends a bleeder resistor from this pin to ground to prevent false turn-on from leakage during undervoltage lockout."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply input; the UC3842B UVLO thresholds are 16V (on) and 10V (off), and the UC3843B thresholds are 8.4V (on) and 7.6V (off)."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Regulated 5V output (4.9 V to 5.1 V at IO = 1.0 mA, TJ = 25°C) that supplies the charging current for CT through 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 MPN ends in -S08-R, which the ordering table lists as SOP-8 tape and reel. The user's hint said ; The pin configuration diagram text on page 2 is scrambled in extraction. The pin mapping was taken f; Pin 3 (CS) and pin 4 (RTCT) are labeled I (input) in the datasheet. Pin 1 (COMP) and pin 6 (OUTPUT) "
        ],
        "pages_sent": 10,
        "cost_usd": 0.0394,
        "at": "2026-10-20T21:09:15"
      },
      "datasheet": {
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        "pages": 10,
        "sha256": "78a2af3e18258f77",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
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        "total": 8,
        "described": 8,
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  "metadata": {
    "specs": {
      "Manufacturer": "UTC Unisonic Tech",
      "Package": "SOIC-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    },
    "characteristics": {
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        {
          "name": "Output Short Circuit Current",
          "symbol": "ISC",
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          "unit": "mA",
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          "typ": -85,
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          "symbol": "ΔfOSC/ΔV",
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          "min": null,
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          "conditions": "12 ≤ VCC ≤25V",
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          "name": "Discharge Current",
          "symbol": "IDISCHG",
          "kind": "electrical",
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        {
          "name": "Input Bias Current",
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          "kind": "electrical",
          "unit": "μA",
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          "typ": -0.1,
          "max": -2,
          "conditions": "VFB=5.0V",
          "source_page": 4,
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        },
        {
          "name": "Open Loop Voltage Gain",
          "symbol": "GVO",
          "kind": "electrical",
          "unit": "dB",
          "min": 65,
          "typ": 90,
          "max": null,
          "conditions": "2 ≤VO≤4V",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Unity Gain Bandwidth",
          "symbol": "GBW",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
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          "max": 1,
          "conditions": "TJ=25℃",
          "source_page": 4,
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        {
          "name": "Power Supply Rejection Ratio",
          "symbol": "PSRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 70,
          "max": null,
          "conditions": "I2V≤VCC≤25V",
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        {
          "name": "Output Sink Current",
          "symbol": "ISINK",
          "kind": "electrical",
          "unit": "mA",
          "min": 2,
          "typ": 12,
          "max": null,
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        {
          "name": "Output Source Current",
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          "kind": "electrical",
          "unit": "mA",
          "min": -0.5,
          "typ": -1,
          "max": null,
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          "name": "Output Voltage Swing High State",
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          "kind": "electrical",
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          "min": 5,
          "typ": 6.2,
          "max": null,
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          "name": "Output Voltage Swing Low State",
          "symbol": "VOL",
          "kind": "electrical",
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          "min": null,
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          "name": "Current Sense Input Voltage Gain",
          "symbol": "GV",
          "kind": "electrical",
          "unit": "V/V",
          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "Note 2, 3",
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        {
          "name": "Maximum Current Sense Input Threshold",
          "symbol": "VI(THR)",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 1,
          "max": 1.1,
          "conditions": "Note 2",
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        {
          "name": "Input Bias Current (Current Sense)",
          "symbol": "II(BIAS)",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": -2,
          "max": -10,
          "conditions": "",
          "source_page": 4,
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        {
          "name": "Propagation Delay",
          "symbol": "tD(IN/OUT)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 150,
          "max": 300,
          "conditions": "Current Sense Input to Output",
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        {
          "name": "Output Low Voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
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          "max": 0.4,
          "conditions": "ISINK=20mA",
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        {
          "name": "Output Low Voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
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          "max": 2.2,
          "conditions": "ISINK=200mA",
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        {
          "name": "Output High Voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 13,
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          "max": 13.5,
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        {
          "name": "Output High Voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 12,
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        {
          "name": "Output Voltage with UVLO Activated",
          "symbol": "VOL (UVLO)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.1,
          "max": 1.1,
          "conditions": "VCC=6.0V, ISINK=1.0mA",
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        {
          "name": "Output Voltage Rise Time",
          "symbol": "tR",
          "kind": "timing",
          "unit": "ns",
          "min": null,
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          "max": 150,
          "conditions": "TJ=25℃, CL=1nF",
          "source_page": 4,
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          "name": "Output Voltage Fall Time",
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          "kind": "timing",
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          "name": "Startup Threshold (UC3842B)",
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          "unit": "V",
          "min": 14.5,
          "typ": 16,
          "max": 17.5,
          "conditions": "UC3842B",
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          "name": "Min. Operating Voltage After Turn-on (UC3842B)",
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          "kind": "electrical",
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          "min": 8.5,
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          "name": "Duty Cycle MAX",
          "symbol": "MAX DC",
          "kind": "electrical",
          "unit": "%",
          "min": 94,
          "typ": 96,
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          "name": "Power Startup Supply Current",
          "symbol": "ICC+IC",
          "kind": "electrical",
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          "conditions": "VCC=14V for UC3842B",
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          "name": "Power Supply Zener Voltage",
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          "kind": "electrical",
          "unit": "V",
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          "typ": 36,
          "max": null,
          "conditions": "ICC=25mA",
          "source_page": 4,
          "source": "datasheet"
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          "name": "Total Power Supply and Zener Current",
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          "kind": "absolute_maximum",
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          "max": 30,
          "conditions": "",
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          "name": "Output Current, Source or Sink",
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          "unit": "A",
          "min": null,
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          "source_page": 3,
          "source": "datasheet"
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          "name": "Output Energy",
          "symbol": "W",
          "kind": "absolute_maximum",
          "unit": "μJ",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Capacitive load per cycle",
          "source_page": 3,
          "source": "datasheet"
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          "name": "Current Sense and Voltage Feedback Inputs",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
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          "name": "Error Amp Output Sink Current",
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          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 3,
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          "name": "Power Dissipation",
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          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 800,
          "conditions": "SOP-8",
          "source_page": 3,
          "source": "datasheet"
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          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 150,
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          "source_page": 3,
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          "name": "Operating Temperature",
          "symbol": "TOPR",
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          "unit": "℃",
          "min": 0,
          "typ": null,
          "max": 70,
          "conditions": "",
          "source_page": 3,
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          "name": "Storage Temperature",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
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        {
          "name": "Junction to Ambient (SOP-8)",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 156,
          "max": null,
          "conditions": "SOP-8",
          "source_page": 3,
          "source": "datasheet"
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