LM2576SX-3.3

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm2576sx-3-3",
  "title": "LM2576SX-3.3",
  "brief": "TECH PUBLIC LM2576SX 3 3 DC-DC Converters, TO-263-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "lm2576sx-3.3"
  ],
  "component": {
    "mpn": "LM2576SX-3.3",
    "manufacturer": "TECH PUBLIC LM2576SX 3 3",
    "package": "TO-263-5",
    "pin_count": 6,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2306011005_TECH-PUBLIC-LM2576SX-3-3_C7419975.pdf",
    "parts": {
      "symbol": "lm2576sx-3-3.kicad_sym",
      "footprint": "lm2576sx-3-3.kicad_mod",
      "model_3d": "lm2576sx-3-3-etched.glb",
      "model_3d_plain": "lm2576sx-3-3.glb",
      "model_3d_step": "lm2576sx-3-3-etched.step",
      "model_3d_step_plain": "lm2576sx-3-3.step",
      "lbr": "lm2576sx-3-3.lbr"
    },
    "distributor_links": {
      "lcsc": "C7419975"
    },
    "pins": [
      {
        "number": "1",
        "name": "Vin",
        "type": "power_in",
        "description": "Unregulated DC input supply. Recommended operating range 4.75V to 40V (absolute max 45V). Bypass locally with a low-ESR bulk capacitor (typ. 100µF) to ground."
      },
      {
        "number": "2",
        "name": "Output",
        "type": "output",
        "description": "Switching output (SW) from the internal 3A NPN power switch. Connects to the catch diode cathode and the output inductor of the buck converter. Absolute max -1V to +25V relative to ground."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference for control circuitry and return for the internal power switch. Tie directly to the ground plane."
      },
      {
        "number": "4",
        "name": "Feedback",
        "type": "input",
        "description": "Output voltage sense input for the internal error amplifier. On the fixed 3.3V version, connect directly to the regulated output node; the internal divider sets Vout = 3.3V (±4%). Feedback bias current is typically 50nA."
      },
      {
        "number": "5",
        "name": "Enable",
        "type": "input",
        "description": "ON/OFF shutdown control input. Logic LOW (<1.0V) or tied to GND enables the regulator; logic HIGH (>2.2V, up to 25V absolute max) forces the regulator into low-power standby (typ. 70µA). Input current typ. 12µA at 5V."
      },
      {
        "number": "6",
        "name": "TAB",
        "type": "power_in",
        "description": "Exposed thermal pad. Present in the package land pattern; connect it per the manufacturer datasheet thermal recommendation. Added because the footprint carries this pad and the symbol had no pin for it.",
        "source": "derived-from-footprint"
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2306011005_TECH-PUBLIC-LM2576SX-3-3_C7419975.pdf",
        "pages": 6,
        "sha256": "0072318ac087ed5c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -7.65,
        -3.4
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "TO-263-5_TabPin6@sha256:77e8ff2d643255fc",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "lm2576sx-3-3.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          15,
          10,
          4.42
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "94c2a3dc1aaad85b6b5193f97d9a7c61b4e28bac25952a1e629557bcf747e246",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm2576sx-3-3-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": "2fd8e5dc81da130ca5c7f3805b84d10af188ece412d79c1348e9d387a31a4d41",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "TECH PUBLIC",
      "Package": "TO-263-5",
      "Category": "PMIC",
      "Pins": "5"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lm2576sx-3.3"
  ],
  "discovery_pitch": "LM2576SX-3.3 (TECH PUBLIC LM2576SX 3 3) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm2576sx-3-3.kicad_sym",
    "lm2576sx-3-3.kicad_mod",
    "lm2576sx-3-3.glb",
    "lm2576sx-3-3.step",
    "lm2576sx-3-3-etched.step",
    "lm2576sx-3-3.lbr",
    "docs/hero.png",
    "docs/lm2576sx-3-3-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "LM2576SX-3.3",
      "kind": "packaging"
    },
    {
      "mpn": "LM2576SX-3.3SX-5.0",
      "kind": "different-part"
    },
    {
      "mpn": "LM2576SX-3.3SX-ADJ",
      "kind": "different-part"
    }
  ],
  "updated_at": "2026-09-25T00:11:34.747Z"
}