LM4991MAX

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm4991max",
  "title": "LM4991MAX",
  "brief": "Texas Instruments Audio Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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  "component": {
    "mpn": "LM4991MAX",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Amplifiers/Comparators",
    "subcategory": "Audio Amplifiers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm4991",
    "parts": {
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      "footprint": "lm4991max.kicad_mod",
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      "model_3d_step_plain": "lm4991max.step",
      "lbr": "lm4991max.lbr"
    },
    "distributor_links": {
      "lcsc": "C2865568",
      "mouser": "926-LM4991MAX"
    },
    "distributor_check": {
      "checked_at": "2026-10-07T21:32:08Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "926-LM4991MAX",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SHUTDOWN",
        "type": "input",
        "description": "Shutdown control input that turns off the amplifier bias circuitry when VDD (logic high) is applied, giving about 0.1µA typical shutdown current; it should be tied to a definite voltage."
      },
      {
        "number": "2",
        "name": "BYPASS",
        "type": "passive",
        "description": "Half-supply bypass pin for the bias voltage, where an external capacitor CB (1.0µF recommended) to ground improves PSRR and click-and-pop performance."
      },
      {
        "number": "3",
        "name": "+IN",
        "type": "input",
        "description": "Non-inverting amplifier input."
      },
      {
        "number": "4",
        "name": "-IN",
        "type": "input",
        "description": "Inverting amplifier input, where the input resistor Ri and feedback resistor Rf set the gain (AVD = 2*(Rf/Ri))."
      },
      {
        "number": "5",
        "name": "Vo1",
        "type": "output",
        "description": "Bridged amplifier output 1, driven by the first amplifier and biased at VDD/2 with no output coupling capacitor required."
      },
      {
        "number": "6",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply input, with an operating range of 2.2V to 5.5V (6.0V absolute maximum) that needs a nearby bypass capacitor."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground connection."
      },
      {
        "number": "8",
        "name": "Vo2",
        "type": "output",
        "description": "Bridged amplifier output 2, driven by the second amplifier (unity-gain inverting), 180° out of phase with Vo1."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin-name and number mapping comes from the SOIC connection diagram (Figure 1) on page 1. The tex",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 27,
        "cost_usd": 0.6526,
        "at": "2026-10-07T21:31:52"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm4991",
        "pages": 27,
        "sha256": "69de3029d691cac1",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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      "footprint": "viewers/footprint.html"
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        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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        "sha256": "1fab52b56f61b04b903903a33dbbfbca191a856ced0a5f474a7c58c47782078e",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "Amplifiers/Comparators",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
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  "discovery_triggers": [
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  "discovery_pitch": "LM4991MAX (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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}