UC2844BD1R2G

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc2844bd1r2g",
  "title": "UC2844BD1R2G",
  "brief": "onsemi AC-DC Controllers and Regulators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "uc2844bd1r2g"
  ],
  "component": {
    "mpn": "UC2844BD1R2G",
    "manufacturer": "onsemi",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/uc2844bd1r2-d.pdf",
    "parts": {
      "symbol": "uc2844bd1r2g.kicad_sym",
      "footprint": "uc2844bd1r2g.kicad_mod",
      "model_3d": "uc2844bd1r2g-etched.glb",
      "model_3d_plain": "uc2844bd1r2g.glb",
      "model_3d_step": "uc2844bd1r2g-etched.step",
      "model_3d_step_plain": "uc2844bd1r2g.step",
      "lbr": "uc2844bd1r2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C77262"
    },
    "pins": [
      {
        "number": "1",
        "name": "Compensation",
        "type": "output",
        "description": "Error amplifier output, used for loop compensation. Typically tied to Voltage Feedback (pin 2) through an R-C network to set the closed-loop bandwidth and phase margin. Output swings from ~0.8 V (low) up to ~6.2 V (high) with ~1 mA source / 12 mA sink capability."
      },
      {
        "number": "2",
        "name": "Voltage Feedback",
        "type": "input",
        "description": "Inverting input of the internal error amplifier. Normally connected to the switching-supply output through a resistor divider; internal reference is 2.5 V. Input bias current typically -0.1 µA, max -1.0 µA (UC284xB) at V_FB = 5.0 V."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Input to the PWM current-sense comparator. A voltage proportional to the switch/inductor current (developed across an external current-sense resistor) is applied here. Peak comparator threshold is 1.0 V typical (max 1.1 V); internal current-sense-to-output voltage gain A_V = 3.0 V/V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. An external resistor R_T from Vref to this pin and a timing capacitor C_T from this pin to GND set the oscillator frequency (f_OSC ≈ 1.72 / (R_T·C_T) for R_T > 5 kΩ). Also sets the maximum output duty cycle (~50% max via internal blanking on alternate cycles)."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground (single ground pin on the 8-pin package; combined signal and power return). All bypass capacitors and the current-sense resistor should return here with a low-impedance path."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "High-current totem-pole gate-drive output for driving an external power MOSFET. Rated 1.0 A peak source/sink; typical rise/fall time 50 ns into 1.0 nF. Output is held low with V_CC below the UVLO threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input for control logic and gate driver. UC2844B UVLO turn-on = 16 V typ, turn-off = 10 V typ (large hysteresis for bootstrap start-up). Startup current 0.3 mA typ; operating current 12 mA typ. Absolute max 36 V (internally clamped by zener; limit I_CC + I_Z ≤ 30 mA)."
      },
      {
        "number": "8",
        "name": "Vref",
        "type": "power_out",
        "description": "Trimmed 5.0 V reference output (±1% at 25 °C, I_O = 1.0 mA). Sources up to ~20 mA for external circuitry; internally current-limited to -85 mA (typ) short-circuit. Bypass to GND with a low-ESR ceramic capacitor."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/uc2844bd1r2-d.pdf",
        "pages": 19,
        "sha256": "e69ff39fc0ea9e08",
        "source_tier": "mfr"
      },
      "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "uc2844bd1r2g-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "a83ad92d7c2cbb4ed0dc97e032d0c545f600ac259db0907e53f3492cb12d7762",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
    "uc2844bd1r2g"
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  "discovery_pitch": "UC2844BD1R2G (onsemi) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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  "files": [
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    "README.md",
    "uc2844bd1r2g.kicad_sym",
    "uc2844bd1r2g.kicad_mod",
    "uc2844bd1r2g.glb",
    "uc2844bd1r2g.step",
    "uc2844bd1r2g-etched.step",
    "uc2844bd1r2g.lbr",
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    "docs/uc2844bd1r2g-datasheet.pdf",
    "viewers/symbol.html",
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  "visibility": {
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  "variants": [
    {
      "mpn": "UC2844BD1R2G",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GD1G",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GN",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GNG",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GD",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GDG",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GDR2",
      "kind": "packaging"
    },
    {
      "mpn": "UC2844BD1R2GDR2G",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T13:28:22.779Z"
}