COS3842BD

{
  "schema_version": 1,
  "type": "component",
  "slug": "cos3842bd",
  "title": "COS3842BD",
  "brief": "COSINE AC-DC Controllers And 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 management (pmic)",
    "cos3842bd",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "COS3842BD",
    "manufacturer": "COSINE",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603348881292087296",
    "parts": {
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      "lbr": "cos3842bd.lbr"
    },
    "distributor_links": {
      "lcsc": "C5367537"
    },
    "distributor_check": {
      "checked_at": "2026-10-14T14:47:19Z",
      "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 for compensation; external compensation components connect here, and forcing COMP to ground lets the user command zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to the error amplifier, normally connected to the switching power supply output through a resistor divider, with a recommended input voltage of up to 2.5 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Input carrying a voltage proportional to inductor current that the PWM uses to terminate output switch conduction, with a recommended input voltage of up to 1 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Oscillator timing pin where resistor RT connects to VREF and capacitor CT connects to ground, setting oscillator frequency and maximum output duty cycle; operation up to 1 MHz is possible."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Ground return pin functioning as both power ground and analog ground; timing and bypass capacitors should be connected close to this pin in a single-point ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Output of the on-chip totem-pole drive stage that directly drives a power MOSFET gate, sourcing and sinking peak currents up to 1 A and held low when VCC is below the turn-on threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply pin for the control IC, rated 30 V maximum with a 7.6 V minimum supply voltage, to be bypassed with a 0.1 µF ceramic low-ESL capacitor and a bulk capacitor at least 10 times the main MOSFET gate capacitance."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5 V reference output trimmed to 1% (4.95 V to 5.05 V), providing charging current for CT through RT, to be bypassed with a 0.1 µF ceramic low-ESL capacitor; reference load current is 0 to 20 mA."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin numbers and names were taken from the Table 1 text on page 2. The Figure 1 pin diagram is a grap; The datasheet's ordering table lists COS3842BD as SOP-8, tape and reel, which matches the requested ",
          "1/8 pin names appear NOWHERE in the datasheet text: ['5:GROUND@p2']"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0419,
        "at": "2026-10-14T14:47:05"
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        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
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        "total": 8,
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  "metadata": {
    "specs": {
      "Manufacturer": "COSINE",
      "Package": "SOP-8",
      "Category": "Power Management (PMIC)",
      "Pins": "8"
    },
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          "name": "Temp. Stability",
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          "kind": "electrical",
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          "min": null,
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          "conditions": "Over operating range",
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          "name": "Total Output Variation",
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          "name": "Short Circuit Output Current",
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          "kind": "electrical",
          "unit": "mA",
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          "name": "Frequency",
          "symbol": "fOSC",
          "kind": "electrical",
          "unit": "kHz",
          "min": 47,
          "typ": 52,
          "max": 57,
          "conditions": "RT = 10 kΩ, CT = 3.3 μF",
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          "name": "Voltage Stability",
          "symbol": "Δf/ΔVIN",
          "kind": "electrical",
          "unit": "%",
          "min": null,
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          "max": 1,
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          "source": "datasheet"
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        {
          "name": "Input Voltage",
          "symbol": "VFB",
          "kind": "electrical",
          "unit": "V",
          "min": 2.42,
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          "max": 2.58,
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          "name": "Input Bias Current",
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          "unit": "μA",
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          "name": "Open Loop Voltage Gain",
          "symbol": "GVOL",
          "kind": "electrical",
          "unit": "dB",
          "min": 65,
          "typ": 90,
          "max": null,
          "conditions": "2 ≤VCOMP ≤ 4 V",
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        {
          "name": "Gain-Bandwidth Product",
          "symbol": "GBP",
          "kind": "electrical",
          "unit": "MHz",
          "min": 0.7,
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          "max": null,
          "conditions": "AV = 0 dB",
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        {
          "name": "Power Supply Rejection Ratio",
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          "max": null,
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          "name": "COMP Sink Current",
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          "kind": "electrical",
          "unit": "mA",
          "min": 2,
          "typ": 12,
          "max": null,
          "conditions": "VFB = 2.7 V, VCOMP=1.1V",
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          "name": "COMP Source Current",
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          "kind": "electrical",
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          "name": "Low-level Output Voltage",
          "symbol": "VOL",
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          "max": 6.2,
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          "name": "Gain",
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          "kind": "electrical",
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          "min": 2.85,
          "typ": 3,
          "max": 3.15,
          "conditions": "G = ΔVCOMP/ΔVISENSE, 0 V ≤ VISENSE ≤ 0.8 V",
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          "name": "Maximum Input Signal",
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          "name": "High-level Output Voltage",
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          "typ": 19,
          "max": null,
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          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "High-level Output Voltage",
          "symbol": "VOH II",
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          "typ": 18,
          "max": null,
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          "conditions": "CL=1nF",
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          "conditions": "CL=1nF",
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          "name": "UVLO Enable Threshold",
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          "min": 14.5,
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          "name": "Maximum Duty Cycle",
          "symbol": "DMAX",
          "kind": "electrical",
          "unit": "%",
          "min": 94,
          "typ": 96,
          "max": 100,
          "conditions": "COS3842/3843",
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        {
          "name": "Package Thermal Resistance, RθJA (Junction-to-ambient)",
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          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "SOP8 package",
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