INA181

{
  "schema_version": 1,
  "type": "component",
  "slug": "ina181",
  "title": "INA181",
  "brief": "TI current-sense amplifier, SOT-23-6. -0.2 to 26 V common mode, bidirectional with REF, 350 kHz. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "amplifier",
    "current-sense",
    "current-shunt-monitor",
    "sot-23-6",
    "texas-instruments"
  ],
  "component": {
    "mpn": "INA181",
    "manufacturer": "Texas Instruments",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "Amplifier",
    "subcategory": "Current-sense amplifier",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ina181.pdf",
    "parts": {
      "symbol": "ina181.kicad_sym",
      "footprint": "ina181.kicad_mod",
      "model_3d": "ina181-etched.glb",
      "model_3d_plain": "ina181.glb",
      "model_3d_step": "ina181-etched.step",
      "model_3d_step_plain": "ina181.step",
      "lbr": "ina181.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "OUT",
        "type": "output",
        "description": "Analog output voltage. V_OUT = Gain x (V_IN+ - V_IN-) + V_REF. Rail-to-rail output."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference."
      },
      {
        "number": "3",
        "name": "IN+",
        "type": "input",
        "description": "Current-sense amplifier positive input. For high-side sensing, connect to the bus-voltage side of the sense resistor; for low-side sensing, connect to the load side. Common-mode range -0.2 V to +26 V."
      },
      {
        "number": "4",
        "name": "IN-",
        "type": "input",
        "description": "Current-sense amplifier negative input. For high-side sensing, connect to the load side of the sense resistor; for low-side sensing, connect to the ground side. Common-mode range -0.2 V to +26 V."
      },
      {
        "number": "5",
        "name": "REF",
        "type": "input",
        "description": "Reference input that sets the output voltage for zero differential input. Tie to GND for unidirectional sensing or to a mid-supply reference for bidirectional sensing. Valid range 0 V to VS."
      },
      {
        "number": "6",
        "name": "VS",
        "type": "power_in",
        "description": "Positive supply. Operating range 2.7 V to 5.5 V. Quiescent current 260 uA (max, INA181). Bypass with 0.1 uF ceramic to GND close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ina181.pdf",
        "pages": 62,
        "sha256": "b8e948e4b605ffaa",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 6,
        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "ina181.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9fe686b4d1b56927a41fa84a9bc1efb61d8a45a123a3db43bcaa05c2891d635",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ina181-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          2.9,
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "bf8de9216a6340bbfc6493b5acd50485963e01dc84700b65dfbac6a870e90c36",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Current-sense amplifier (voltage output)",
      "Common-mode range": "-0.2 V to 26 V",
      "Gain options": "20 / 50 / 100 / 200 V/V (A1-A4)",
      "Bandwidth": "350 kHz (gain 20)",
      "Direction": "Bidirectional (via REF)",
      "Supply": "2.7-5.5 V",
      "Package": "SOT-23-6"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ina181",
    "current sense amplifier",
    "shunt monitor",
    "high side current sense amp"
  ],
  "discovery_pitch": "TI INA181 current-sense amplifier (SOT-23-6) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
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    "ina181.kicad_mod",
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    "ina181.lbr",
    "docs/hero.png",
    "docs/ina181-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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  ],
  "variants": [
    {
      "mpn": "INA181A1IDBVR (gain 20)",
      "kind": "packaging"
    },
    {
      "mpn": "INA181A2IDBVR (gain 50)",
      "kind": "packaging"
    },
    {
      "mpn": "INA181A3IDBVR (gain 100)",
      "kind": "packaging"
    },
    {
      "mpn": "INA181A4IDBVR (gain 200)",
      "kind": "packaging"
    }
  ]
}