UC3842M

{
  "slug": "uc3842m",
  "version": "0.1.0",
  "type": "component",
  "description": "HGSEMI AC-DC Controllers And Regulators, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3842m",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3842m.kicad_sym",
    "uc3842m.kicad_mod",
    "uc3842m.glb",
    "uc3842m.step",
    "uc3842m.lbr",
    "docs/hero.png",
    "docs/uc3842m-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3842m-hero.glb",
    "uc3842m-hero.overlay.json",
    "uc3842m-etched.glb"
  ],
  "component": {
    "mpn": "UC3842M",
    "manufacturer": "HGSEMI",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8758163524801433600",
    "parts": {
      "symbol": "uc3842m.kicad_sym",
      "footprint": "uc3842m.kicad_mod",
      "model_3d": "uc3842m-hero.glb",
      "model_3d_plain": "uc3842m-etched.glb",
      "model_3d_step": "uc3842m-etched.step",
      "model_3d_step_plain": "uc3842m.step",
      "lbr": "uc3842m.lbr"
    },
    "distributor_links": {
      "lcsc": "C434474"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T19:18:49Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "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 connected to the switching supply through a resistor divider; the internal reference on the non-inverting side is 2.5 V (Vfb 2.42 V to 2.58 V)."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Voltage proportional to the inductor coil current is applied here, and the PWM turns the output off when the voltage on this pin reaches the threshold; maximum input signal is 0.9 V to 1.1 V and absolute input range is -0.3 V to 5.5 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "RT is connected to VREF and CT to ground to set the oscillator frequency and maximum duty cycle, with frequency up to 500 kHz."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the controller."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Drives the gate of the power MOSFET directly, sourcing or sinking peak currents up to 1 A."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply for the control IC; the absolute maximum supply voltage is 30 V, with undervoltage lockout start at 16 V (typ.) and minimum operating voltage 10 V (typ.)."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "Reference voltage output (5.0 V typ., 4.90 V to 5.10 V at Tj = 25 °C, 1 mA load) that charges timing 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 datasheet pin table (page 2) covers DIP-8 and SOP-8 together under one pin diagram; the pin numb; Pin types are inferred under KiCad classes: COMP and OUTPUT as output, VFB and ISENSE as input, RT/C; Pin 7 VCC and pin 8 VREF descriptions combine the stated limits from the ratings and electrical char"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0394,
        "at": "2026-10-18T19:16:36"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8758163524801433600",
        "pages": 10,
        "sha256": "f01f4065a8e98ef1",
        "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": "uc3842m.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3842m-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0cd0047e73c356b972ea3a3f6d6726ed754edd448a69ee0666caee3a9882a3d9",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}