INA128

{
  "schema_version": 1,
  "type": "component",
  "slug": "ina128",
  "title": "INA128",
  "brief": "TI precision instrumentation amplifier, SOIC-8. Gain 1-10000 set by one resistor, high CMRR, low drift. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "amplifier",
    "instrumentation-amp",
    "precision",
    "sensor",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "INA128",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Amplifier",
    "subcategory": "Instrumentation amplifier",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ina128.pdf",
    "parts": {
      "symbol": "ina128.kicad_sym",
      "footprint": "ina128.kicad_mod",
      "model_3d": "ina128-etched.glb",
      "model_3d_plain": "ina128.glb",
      "lbr": "ina128.lbr",
      "model_3d_step": "ina128-etched.step",
      "model_3d_step_plain": "ina128.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "RG",
        "type": "passive",
        "description": "Gain-setting pin. For gains greater than 1, place a gain resistor between pin 1 and pin 8. Gain is set as G = 1 + 50kΩ/RG. Leave open for G = 1."
      },
      {
        "number": "2",
        "name": "VIN-",
        "type": "input",
        "description": "Inverting (negative) analog input of the instrumentation amplifier. Input common-mode voltage range is (V-)+2V to (V+)-2V; safe input voltage is ±40V with RS = 0Ω."
      },
      {
        "number": "3",
        "name": "VIN+",
        "type": "input",
        "description": "Non-inverting (positive) analog input of the instrumentation amplifier. Input common-mode voltage range is (V-)+2V to (V+)-2V; safe input voltage is ±40V with RS = 0Ω."
      },
      {
        "number": "4",
        "name": "V-",
        "type": "power_in",
        "description": "Negative supply rail. Dual-supply range ±2.25V to ±18V; single-supply operation V+ = 4.5V to 36V with V- = 0V. Decouple locally to ground."
      },
      {
        "number": "5",
        "name": "REF",
        "type": "input",
        "description": "Reference input that sets the output DC reference level. Must be driven by a low-impedance source or connected directly to ground; any source impedance here directly degrades CMRR."
      },
      {
        "number": "6",
        "name": "VO",
        "type": "output",
        "description": "Amplifier output. VO = G × (VIN+ - VIN-) + VREF, where G = 1 + 50kΩ/RG. Short-circuit protected to VS/2 continuously."
      },
      {
        "number": "7",
        "name": "V+",
        "type": "power_in",
        "description": "Positive supply rail. Dual-supply range ±2.25V to ±18V; single-supply 4.5V to 36V with V- = 0V. Decouple locally with a 0.1µF ceramic capacitor."
      },
      {
        "number": "8",
        "name": "RG",
        "type": "passive",
        "description": "Gain-setting pin. For gains greater than 1, place a gain resistor between pin 1 and pin 8. Gain is set as G = 1 + 50kΩ/RG. Leave open for G = 1."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ina128.pdf",
        "pages": 42,
        "sha256": "1b13f3f996838202",
        "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"
    },
    "models_3d": [
      {
        "file": "ina128.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ina128-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": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "cf60ddad942c85d679cef98519b416fc65ad6cfa72e4c2abd1967a532f71a25b",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Instrumentation amplifier",
      "Gain": "1 to 10000 (G = 1 + 50k/RG)",
      "Gain set": "single external resistor (RG)",
      "CMRR": "120 dB at G=100",
      "Offset voltage": "50 µV max",
      "Supply": "±2.25 to ±18 V",
      "Quiescent current": "~700 µA",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ina128",
    "instrumentation amplifier",
    "in-amp",
    "bridge amplifier",
    "precision differential amp"
  ],
  "discovery_pitch": "INA128 precision instrumentation amplifier (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "ina128.kicad_sym",
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    "ina128.lbr",
    "docs/hero.png",
    "docs/ina128-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ina128-etched.step"
  ],
  "variants": [
    {
      "mpn": "INA128UA (SOIC-8)",
      "kind": "packaging"
    },
    {
      "mpn": "INA128U (SOIC-8, tape & reel)",
      "kind": "packaging"
    }
  ]
}