INA333 Instrumentation Amplifier

{
  "schema_version": 1,
  "type": "component",
  "slug": "ina333",
  "title": "INA333 Instrumentation Amplifier",
  "brief": "Micropower, zero-drift, precision instrumentation amplifier with a single-resistor gain set.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "instrumentation-amp",
    "zero-drift",
    "precision",
    "low-power",
    "ti",
    "msop-8"
  ],
  "component": {
    "mpn": "INA333",
    "manufacturer": "Texas Instruments",
    "package": "MSOP-8",
    "pin_count": 8,
    "category": "Analog",
    "subcategory": "Instrumentation Amplifier",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ina333.pdf",
    "parts": {
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      "footprint": "ina333.kicad_mod",
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      "lbr": "ina333.lbr",
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "RG",
        "type": "passive",
        "description": "Gain-setting pin. Place an external gain resistor RG between pins 1 and 8 to set gain G = 1 + (100 kΩ / RG). Leave open for unity gain (G = 1)."
      },
      {
        "number": "2",
        "name": "VIN-",
        "type": "input",
        "description": "Negative (inverting) analog input. Input voltage range is (V-) + 0.1 V to (V+) - 0.1 V; input bias current is ±70 pA typ (±200 pA max)."
      },
      {
        "number": "3",
        "name": "VIN+",
        "type": "input",
        "description": "Positive (non-inverting) analog input. Input voltage range is (V-) + 0.1 V to (V+) - 0.1 V; input bias current is ±70 pA typ (±200 pA max)."
      },
      {
        "number": "4",
        "name": "V-",
        "type": "power_in",
        "description": "Negative power supply. Single-supply range +1.8 V to +5.5 V (with V- = GND) or dual-supply ±0.9 V to ±2.75 V. Absolute maximum supply span (V+) - (V-) = 7 V."
      },
      {
        "number": "5",
        "name": "REF",
        "type": "input",
        "description": "Reference input. Sets the output zero (offset) voltage. Must be driven from a low-impedance source or connected to ground; internal RIN ≈ 300 kΩ, so a driving impedance error will degrade CMRR and gain accuracy."
      },
      {
        "number": "6",
        "name": "VOUT",
        "type": "output",
        "description": "Amplifier output. Rail-to-rail output swings to within 50 mV of the supply rails with RL = 10 kΩ; short-circuit current is limited to -40/+5 mA."
      },
      {
        "number": "7",
        "name": "V+",
        "type": "power_in",
        "description": "Positive power supply. Single-supply range +1.8 V to +5.5 V or dual-supply ±0.9 V to ±2.75 V. Quiescent current is 50 µA typ (75 µA max)."
      },
      {
        "number": "8",
        "name": "RG",
        "type": "passive",
        "description": "Gain-setting pin (paired with pin 1). Place an external gain resistor RG between pins 1 and 8 to set gain G = 1 + (100 kΩ / RG). Leave open for unity gain."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ina333.pdf",
        "pages": 35,
        "sha256": "446404e162fbb07e",
        "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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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3.0,
          0.95
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "847c4c5023fe1603fbd36900a5dcc4bd3901ba473f71d42c9a469f0236eaadf3",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "role": "eda",
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Instrumentation amplifier (3-op-amp, zero-drift)",
      "Gain": "1 to 1000 (single external resistor)",
      "Input offset voltage": "25 uV typ, 75 uV max",
      "Offset drift": "0.1 uV/C typ",
      "Supply voltage": "1.8 V to 5.5 V",
      "Supply current": "50 uA typ",
      "CMRR": "100 dB min (G >= 10)",
      "Operating temperature": "-40 C to 85 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "instrumentation amplifier",
    "bridge sensor amplifier",
    "biopotential front end",
    "low-offset in-amp"
  ],
  "discovery_pitch": "A zero-drift in-amp with one external gain resistor for bridge, thermocouple, and biopotential sensor front ends.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "variants": [
    {
      "mpn": "INA333IDGKR",
      "kind": "unknown"
    },
    {
      "mpn": "INA333IDGKT",
      "kind": "unknown"
    },
    {
      "mpn": "INA333IDRGR",
      "kind": "unknown"
    },
    {
      "mpn": "INA333IDRGT",
      "kind": "unknown"
    }
  ]
}