UC3856DWTR

{
  "slug": "uc3856dwtr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments DC-DC Converters, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "uc3856dwtr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "uc3856dwtr.kicad_sym",
    "uc3856dwtr.kicad_mod",
    "uc3856dwtr.glb",
    "uc3856dwtr.step",
    "uc3856dwtr.lbr",
    "docs/hero.png",
    "docs/uc3856dwtr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "uc3856dwtr-hero.glb",
    "uc3856dwtr-hero.overlay.json"
  ],
  "component": {
    "mpn": "UC3856DWTR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16-300mil",
    "pin_count": 16,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/uc3856",
    "parts": {
      "symbol": "uc3856dwtr.kicad_sym",
      "footprint": "uc3856dwtr.kicad_mod",
      "model_3d": "uc3856dwtr-hero.glb",
      "model_3d_plain": "uc3856dwtr.glb",
      "model_3d_step": "uc3856dwtr-etched.step",
      "model_3d_step_plain": "uc3856dwtr.step",
      "lbr": "uc3856dwtr.lbr"
    },
    "distributor_links": {
      "lcsc": "C544719",
      "digikey": "296-UC3856DWTR-ND",
      "mouser": "595-UC3856DWTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T21:41:43Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-UC3856DWTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-UC3856DWTR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CL SS",
        "type": "input",
        "description": "Current limit adjust / soft start pin; current into it above 3mA (min latching) latches the circuit into shutdown, below 0.8mA max does not latch."
      },
      {
        "number": "2",
        "name": "VREF",
        "type": "power_out",
        "description": "5.1V reference regulator output (5.00 to 5.20V on UC3856 at 1mA), short circuit current -25 to -65mA."
      },
      {
        "number": "3",
        "name": "CS-",
        "type": "input",
        "description": "Current sense amplifier inverting input; absolute maximum -0.3V to +3V, common mode range 0 to 3V."
      },
      {
        "number": "4",
        "name": "CS+",
        "type": "input",
        "description": "Current sense amplifier non-inverting input; absolute maximum -0.3V to +3V, common mode range 0 to 3V."
      },
      {
        "number": "5",
        "name": "EA+",
        "type": "input",
        "description": "Error amplifier non-inverting input; range -0.3V to VIN, common mode 0 to VIN-2V."
      },
      {
        "number": "6",
        "name": "EA-",
        "type": "input",
        "description": "Error amplifier inverting input; range -0.3V to VIN, common mode 0 to VIN-2V."
      },
      {
        "number": "7",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier output; can source up to 0.5mA (absolute maximum -5mA)."
      },
      {
        "number": "8",
        "name": "CT",
        "type": "passive",
        "description": "Oscillator timing capacitor connection; CT sets output deadtime (Td = 250CT for large RT) and frequency fT = 2/(RT·CT)."
      },
      {
        "number": "9",
        "name": "RT",
        "type": "passive",
        "description": "Oscillator timing resistor connection; with CT sets oscillator frequency fT = 2/(RT·CT)."
      },
      {
        "number": "10",
        "name": "SYNC",
        "type": "bidirectional",
        "description": "Oscillator sync, low impedance TTL compatible output that is tri-state when used as a sync input; output current ±10mA max."
      },
      {
        "number": "11",
        "name": "AOUT",
        "type": "output",
        "description": "Totem pole output A, 1.5A peak, 0.5A DC and 2.0A pulse (0.5µs) absolute maximum source or sink."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; all voltages are measured with respect to this pin."
      },
      {
        "number": "13",
        "name": "VC",
        "type": "power_in",
        "description": "Collector supply for the output totem poles; absolute maximum +40V."
      },
      {
        "number": "14",
        "name": "BOUT",
        "type": "output",
        "description": "Totem pole output B, 1.5A peak, 0.5A DC and 2.0A pulse (0.5µs) absolute maximum source or sink."
      },
      {
        "number": "15",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply voltage input; absolute maximum +40V, UVLO startup threshold 8.0V max with 0.7V hysteresis."
      },
      {
        "number": "16",
        "name": "SHUTDOWN",
        "type": "input",
        "description": "Shutdown input with 1V threshold (0.95 to 1.05V); input range 0 to 5V, absolute maximum -0.3V to +10V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet has no pin-description table, so the pin descriptions are built from the block diagram",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 12,
        "cost_usd": 0.3223,
        "at": "2026-10-08T21:39:47"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/uc3856",
        "pages": 22,
        "sha256": "ce7201c374ef8623",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "uc3856dwtr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc3856dwtr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5292b93eb995617ce249d5817c862a0b0913173953ffdf7ab00118489e486319",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}