UC2843D8TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "uc2843d8tr",
  "title": "UC2843D8TR",
  "brief": "Texas Instruments DC-DC Converters, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "uc2843d8tr"
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  "component": {
    "mpn": "UC2843D8TR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.ti.com/lit/ds/symlink/uc2843d8tr.pdf",
    "parts": {
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      "footprint": "uc2843d8tr.kicad_mod",
      "model_3d": "uc2843d8tr-etched.glb",
      "model_3d_plain": "uc2843d8tr.glb",
      "model_3d_step": "uc2843d8tr-etched.step",
      "model_3d_step_plain": "uc2843d8tr.step",
      "lbr": "uc2843d8tr.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "COMP",
        "type": "output",
        "description": "Error amplifier compensation pin. Connect external compensation components to modify the error amplifier output. The error amplifier is internally current-limited; forcing COMP to GROUND commands zero duty cycle."
      },
      {
        "number": "2",
        "name": "VFB",
        "type": "input",
        "description": "Inverting input to the internal error amplifier. VFB is used to control the power converter voltage-feedback loop for stability. Internal reference is 2.5 V."
      },
      {
        "number": "3",
        "name": "ISENSE",
        "type": "input",
        "description": "Primary-side current sense input. Connect to the current sensing resistor; the PWM uses this signal to terminate OUTPUT switch conduction. Max input 1 V; a voltage ramp can be applied here for voltage-mode control."
      },
      {
        "number": "4",
        "name": "RT/CT",
        "type": "bidirectional",
        "description": "Fixed-frequency oscillator set point. Connect a timing resistor R_RT to VREF and timing capacitor C_CT to GROUND to set the switching frequency. f_OSC = 1.72 / (R_RT * C_CT); R_RT must be >=5 kΩ. Up to 500 kHz operation."
      },
      {
        "number": "5",
        "name": "GROUND",
        "type": "power_in",
        "description": "Analog and power ground return for the device. In the 8-pin package (no separate PWRGND), GROUND serves as both analog and power ground."
      },
      {
        "number": "6",
        "name": "OUTPUT",
        "type": "output",
        "description": "Gate drive for the external N-channel MOSFET. On-chip totem-pole driver sources and sinks peak currents up to 1 A. OUTPUT is actively held low when VCC is below the turnon (UVLO) threshold."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Analog controller bias input that also powers the gate driver in the 8-pin package. Recommended supply 12-28 V; abs max 30 V (self-limiting above I_VCC = 30 mA). Requires a ~0.1 µF bypass to GROUND plus an additional bypass at least 10x the gate capacitance of the switching FET."
      },
      {
        "number": "8",
        "name": "VREF",
        "type": "power_out",
        "description": "5 V trimmed reference output. Provides charging current to the oscillator timing capacitor through R_RT. Requires a minimum 0.1 µF ceramic bypass to GROUND close to the pin. Max load current 20 mA."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/uc2843d8tr.pdf",
        "pages": 56,
        "sha256": "0a519514b4917848",
        "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"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "PMIC",
      "Pins": "8"
    }
  },
  "variants": [
    {
      "mpn": "UC2843D8TRD",
      "kind": "packaging"
    },
    {
      "mpn": "UC2843D8TR",
      "kind": "packaging"
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    {
      "mpn": "UC2843D8TRDR",
      "kind": "packaging"
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    {
      "mpn": "UC2843D8TRN",
      "kind": "packaging"
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    {
      "mpn": "UC2843D8TRP",
      "kind": "packaging"
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    {
      "mpn": "UC2843D8TRJ",
      "kind": "packaging"
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    {
      "mpn": "UC2843D8TRJG",
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    {
      "mpn": "UC2843D8TRD14",
      "kind": "packaging"
    },
    {
      "mpn": "UC2843D8TRDW",
      "kind": "packaging"
    },
    {
      "mpn": "UC2843D8TRW",
      "kind": "packaging"
    },
    {
      "mpn": "UC2843D8TRFK",
      "kind": "packaging"
    }
  ],
  "sections": [
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    "breadcrumbs",
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  "discovery_triggers": [
    "uc2843d8tr"
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  "discovery_pitch": "UC2843D8TR (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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  "files": [
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    "docs/uc2843d8tr-datasheet.pdf",
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  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T13:27:49.541Z"
}