UC3844BD1R2G

{
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  "type": "component",
  "slug": "uc3844bd1r2g",
  "title": "UC3844BD1R2G",
  "brief": "onsemi AC-DC Controllers and Regulators, SOIC-8-150mil. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
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    "pmic",
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  "component": {
    "mpn": "UC3844BD1R2G",
    "manufacturer": "onsemi",
    "package": "SOIC-8-150mil",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "AC-DC Controllers and Regulators",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/uc3844bd1r2-d.pdf",
    "parts": {
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    "distributor_links": {
      "lcsc": "C7117"
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    "pins": [
      {
        "number": "1",
        "name": "Compensation",
        "type": "output",
        "description": "Error-amplifier output / loop compensation node. Available for external loop-compensation networks connected to the Voltage Feedback pin. Also drives the internal current-sense comparator through a 2 V level shift and 1/3 divider."
      },
      {
        "number": "2",
        "name": "Voltage Feedback",
        "type": "input",
        "description": "Inverting input of the error amplifier. Normally connected to the switching-power-supply output through a resistor divider; internally referenced to 2.5 V. Input bias current typically -0.1 uA."
      },
      {
        "number": "3",
        "name": "Current Sense",
        "type": "input",
        "description": "Current-sense comparator input. A voltage proportional to primary switch current (via a ground-referenced sense resistor) is applied here. Trips PWM latch when it reaches 1.0 V (typ) scaled from the compensation pin; input range -0.3 to +5.5 V."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "passive",
        "description": "Oscillator timing pin. An external resistor to Vref and capacitor to GND set the oscillator frequency (fOSC ~ 1.72/(RT*CT) for RT > 5 k) and output deadtime. Guaranteed to 250 kHz; usable to 500 kHz output switching frequency."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground (control and power ground shared in the 8-pin package). Return for all internal circuitry and the totem-pole output stage."
      },
      {
        "number": "6",
        "name": "Output",
        "type": "output",
        "description": "High-current totem-pole output for driving a power MOSFET gate directly. Rated for 1.0 A source/sink peak; typical rise/fall time 50 ns with 1 nF load. Duty cycle limited to 50% max (UC3844B/UC2844B)."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply for control logic and output driver. UVLO on/off thresholds 16 V / 10 V (UC3844B). Absolute maximum 36 V; internal zener clamp at ~36 V (IZ up to 25 mA). Startup current ~0.5 mA, operating ~17 mA."
      },
      {
        "number": "8",
        "name": "Vref",
        "type": "power_out",
        "description": "5.0 V trimmed reference output (+/-1% at 25 C). Sources up to 20 mA for external circuitry and the oscillator timing resistor; short-circuit current typically -85 mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/uc3844bd1r2-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"
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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        "sha256": "76ccb4465cda8ab74d92e3c8abfd8275772e5b21bc186d032ce671df148f09aa",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "SOIC-8-150mil",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "UC3844BD1R2G (onsemi) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "variants": [
    {
      "mpn": "UC3844BD1R2G",
      "kind": "packaging"
    },
    {
      "mpn": "UC3844BD1R2GD1G",
      "kind": "packaging"
    },
    {
      "mpn": "UC3844BD1R2GN",
      "kind": "packaging"
    },
    {
      "mpn": "UC3844BD1R2GNG",
      "kind": "packaging"
    },
    {
      "mpn": "UC3844BD1R2GD",
      "kind": "packaging"
    },
    {
      "mpn": "UC3844BD1R2GDR2G",
      "kind": "packaging"
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  ],
  "updated_at": "2026-09-25T13:32:05.156Z"
}