UC3842BL-S08-R

{
  "slug": "uc3842bl-s08-r",
  "version": "0.1.0",
  "type": "component",
  "description": "UTC Unisonic Tech AC-DC Controllers And Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3842bl-s08-r",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3842bl-s08-r.kicad_sym",
    "uc3842bl-s08-r.kicad_mod",
    "uc3842bl-s08-r.glb",
    "uc3842bl-s08-r.step",
    "uc3842bl-s08-r.lbr",
    "docs/hero.png",
    "docs/uc3842bl-s08-r-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3842bl-s08-r-hero.glb",
    "uc3842bl-s08-r-hero.overlay.json",
    "uc3842bl-s08-r-etched.glb"
  ],
  "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": {
      "symbol": "uc3842bl-s08-r.kicad_sym",
      "footprint": "uc3842bl-s08-r.kicad_mod",
      "model_3d": "uc3842bl-s08-r-hero.glb",
      "model_3d_plain": "uc3842bl-s08-r-etched.glb",
      "model_3d_step": "uc3842bl-s08-r-etched.step",
      "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": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586175230138601472",
        "pages": 10,
        "sha256": "78a2af3e18258f77",
        "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": "uc3842bl-s08-r.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": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3842bl-s08-r-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": "8b5eab3dc49362b223204eafa0bd34d13a8f8e5dd493723571dfa1a11fc6e4b7",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}