LM4873MTEX

{
  "slug": "lm4873mtex",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Audio Amplifiers, HTSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "amplifiers-comparators",
    "lm4873mtex",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm4873mtex.kicad_sym",
    "lm4873mtex.kicad_mod",
    "lm4873mtex.glb",
    "lm4873mtex.step",
    "lm4873mtex.lbr",
    "docs/hero.png",
    "docs/lm4873mtex-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm4873mtex-hero.glb",
    "lm4873mtex-hero.overlay.json"
  ],
  "component": {
    "mpn": "LM4873MTEX",
    "manufacturer": "Texas Instruments",
    "package": "HTSSOP-20",
    "pin_count": 21,
    "category": "Amplifiers/Comparators",
    "subcategory": "Audio Amplifiers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm4873",
    "parts": {
      "symbol": "lm4873mtex.kicad_sym",
      "footprint": "lm4873mtex.kicad_mod",
      "model_3d": "lm4873mtex-hero.glb",
      "model_3d_plain": "lm4873mtex.glb",
      "model_3d_step": "lm4873mtex-etched.step",
      "model_3d_step_plain": "lm4873mtex.step",
      "lbr": "lm4873mtex.lbr"
    },
    "distributor_links": {
      "lcsc": "C4991506",
      "mouser": "926-LM4873MTEX"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T23:56:54Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": "926-LM4873MTEX",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SHUTDOWN",
        "type": "input",
        "description": "Applying VDD activates micro-power shutdown (logic threshold typically VDD/2, 0.7 µA typ shutdown current), logic low gives normal operation."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; all voltages are measured with respect to the GND pins."
      },
      {
        "number": "3",
        "name": "+OUT A",
        "type": "output",
        "description": "Channel A non-inverting bridge output; the speaker load is connected between -OUT A and +OUT A."
      },
      {
        "number": "4",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply, 2.0V to 5.5V operating range, bypassed with a local 1.0 µF tantalum capacitor to ground."
      },
      {
        "number": "5",
        "name": "-OUT A",
        "type": "output",
        "description": "Channel A inverting bridge output (Amp1A output); also the headphone drive output in single-ended mode."
      },
      {
        "number": "6",
        "name": "-IN A",
        "type": "input",
        "description": "Channel A inverting input for stereo input 1 (selected when MUX CTRL is low), with Ri and Rf setting the gain."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; all voltages are measured with respect to the GND pins."
      },
      {
        "number": "8",
        "name": "+IN A",
        "type": "input",
        "description": "Channel A non-inverting input."
      },
      {
        "number": "9",
        "name": "-IN A2",
        "type": "input",
        "description": "Channel A inverting input for stereo input 2, selected when MUX CTRL is high."
      },
      {
        "number": "10",
        "name": "MUX CTRL",
        "type": "input",
        "description": "Selects stereo input 1 when low or stereo input 2 when high (can be tied to HP-IN to switch gain with headphone insertion)."
      },
      {
        "number": "11",
        "name": "-IN B2",
        "type": "input",
        "description": "Channel B inverting input for stereo input 2, selected when MUX CTRL is high."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "13",
        "name": "+IN B",
        "type": "input",
        "description": "Channel B non-inverting input."
      },
      {
        "number": "14",
        "name": "BYPASS",
        "type": "passive",
        "description": "Half-supply bias node; a 1 µF capacitor CB to ground improves PSRR and sets turn-on time and click and pop performance."
      },
      {
        "number": "15",
        "name": "-IN B",
        "type": "input",
        "description": "Channel B inverting input for stereo input 1 (selected when MUX CTRL is low), with Ri and Rf setting the gain."
      },
      {
        "number": "16",
        "name": "-OUT B",
        "type": "output",
        "description": "Channel B inverting bridge output; the speaker load is connected between -OUT B and +OUT B."
      },
      {
        "number": "17",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply, 2.0V to 5.5V operating range, bypassed with a local 1.0 µF tantalum capacitor to ground."
      },
      {
        "number": "18",
        "name": "+OUT B",
        "type": "output",
        "description": "Channel B non-inverting bridge output."
      },
      {
        "number": "19",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; all voltages are measured with respect to the GND pins."
      },
      {
        "number": "20",
        "name": "HP-IN",
        "type": "input",
        "description": "Headphone control; a voltage between 4V and VDD turns off Amp2A/Amp2B for single-ended headphone mode, 0.8V max keeps bridged mode."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "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 exposed die-attach pad (PowerPAD) has no pin number or name in the pinout figure. The datasheet ; The pin 6 and pin 15 labels in the figure are '-IN A' and '-IN B'. I read them as the input 1 pair (; The pin function types for BYPASS and the output pins are my own classification. The pin 14 descript",
          "exposed pad 21 added from the footprint",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 33,
        "cost_usd": 0.8657,
        "at": "2026-10-08T23:55:50"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm4873",
        "pages": 33,
        "sha256": "3aa470069c66c77f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lm4873mtex.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.41,
          6.5,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "84424b6f33b67b1f95c23c80b4f670e089660472b7690b8be273f3b284fc2553",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm4873mtex-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.41,
          6.5,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "52c0f948e554b8b0fd0015d23e8a012fba9c37c1a5db66d2f4e449d284f61df8",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}