U4082BG-2

{
  "slug": "u4082bg-2",
  "version": "0.1.0",
  "type": "component",
  "description": "UTC Unisonic Tech Audio Amplifiers, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
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    "amplifiers-comparators",
    "u4082bg-2",
    "factory-2.0.0",
    "extractor-text"
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  "dependencies": {},
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    "path": "docs/hero.png"
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  "component": {
    "mpn": "U4082BG-2",
    "manufacturer": "UTC Unisonic Tech",
    "package": "SOP-28",
    "pin_count": 28,
    "category": "Amplifiers/Comparators",
    "subcategory": "Audio Amplifiers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603078363569266688",
    "parts": {
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      "footprint": "u4082bg-2.kicad_mod",
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      "model_3d_step_plain": "u4082bg-2.step",
      "lbr": "u4082bg-2.lbr"
    },
    "distributor_links": {
      "lcsc": "C7509617"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T09:59:04Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "FO",
        "type": "output",
        "description": "Output of the filter, with an output impedance of less than 50Ω."
      },
      {
        "number": "2",
        "name": "FI",
        "type": "input",
        "description": "Input of the filter, with an input impedance of less than 1MΩ."
      },
      {
        "number": "3",
        "name": "CD",
        "type": "input",
        "description": "Chip disable input: logic low (below 0.8V) selects normal operation and logic high (above 2V) disables the IC, with about 90kΩ nominal input impedance."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply pin requiring +2.8V to +6.5V at 5mA; when VCC falls below 3.5V in receive mode, the AGC reduces the receive attenuator gain by 25dB."
      },
      {
        "number": "5",
        "name": "HTO+",
        "type": "output",
        "description": "Output of the second hybrid amplifier, whose gain is internally fixed at -1."
      },
      {
        "number": "6",
        "name": "HTO-",
        "type": "output",
        "description": "Output of the first hybrid amplifier, whose gain is set by external resistors."
      },
      {
        "number": "7",
        "name": "HTI",
        "type": "input",
        "description": "Input and summing node of the first hybrid amplifier, with DC level about equal to VB."
      },
      {
        "number": "8",
        "name": "TXO",
        "type": "output",
        "description": "Output of the transmit attenuator, with DC level about VB."
      },
      {
        "number": "9",
        "name": "TXI",
        "type": "input",
        "description": "Input of the transmit attenuator, with a maximum signal level of 350 mVrms and 10kΩ input impedance."
      },
      {
        "number": "10",
        "name": "MCO",
        "type": "output",
        "description": "Output of the microphone amplifier, whose gain is set by external resistors and which is limited to ±1 mA load current."
      },
      {
        "number": "11",
        "name": "MCI",
        "type": "input",
        "description": "Summing node of the microphone amplifier input, with DC level VB."
      },
      {
        "number": "12",
        "name": "MUT",
        "type": "input",
        "description": "Mute input: logic low (below 0.8V) gives normal operation and logic high (above 2V) mutes the microphone amplifier only, with 90kΩ input impedance."
      },
      {
        "number": "13",
        "name": "VLC",
        "type": "input",
        "description": "Volume control input: VLC=VB gives maximum receive attenuator gain, the receive gain is down 35dB at VLC=0.3×VB, and it does not affect transmit modes."
      },
      {
        "number": "14",
        "name": "CT",
        "type": "passive",
        "description": "Mode-switching timing node whose external RC sets the circuit response time."
      },
      {
        "number": "15",
        "name": "VB",
        "type": "power_out",
        "description": "Output at about Vcc/2 that serves as the system AC ground and bias for the volume control, and requires a filter capacitor."
      },
      {
        "number": "16",
        "name": "CPT",
        "type": "passive",
        "description": "Pin where the RC sets the time constant of the transmit background noise monitor."
      },
      {
        "number": "17",
        "name": "TLI2",
        "type": "input",
        "description": "Input to the transmit level detector on the microphone/speaker side."
      },
      {
        "number": "18",
        "name": "TLO2",
        "type": "output",
        "description": "Output of the transmit level detector on the microphone/speaker side, which is also the input to the transmit background monitor."
      },
      {
        "number": "19",
        "name": "RLO2",
        "type": "output",
        "description": "Output of the receive level detector on the microphone/speaker side."
      },
      {
        "number": "20",
        "name": "RLI2",
        "type": "input",
        "description": "Input to the receive level detector on the microphone/speaker side."
      },
      {
        "number": "21",
        "name": "RXI",
        "type": "input",
        "description": "Input to the receive attenuator and dial tone detector, with a maximum input level of 350 mVrms and 10kΩ input impedance."
      },
      {
        "number": "22",
        "name": "RXO",
        "type": "output",
        "description": "Output of the receive attenuator, with DC level at VB."
      },
      {
        "number": "23",
        "name": "TLI1",
        "type": "input",
        "description": "Input to the transmit level detector on the line side."
      },
      {
        "number": "24",
        "name": "TLO1",
        "type": "output",
        "description": "Output of the transmit level detector on the line side, which is also the input to the transmit background monitor."
      },
      {
        "number": "25",
        "name": "RLO1",
        "type": "output",
        "description": "Output of the receive level detector on the line side."
      },
      {
        "number": "26",
        "name": "RLI1",
        "type": "input",
        "description": "Input to the receive level detector on the line side."
      },
      {
        "number": "27",
        "name": "CPR",
        "type": "passive",
        "description": "Pin where the RC sets the time constant of the receive background noise monitor."
      },
      {
        "number": "28",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The MPN U4082BG-2 does not appear in the datasheet ordering table. The SOP-28 orderable parts listed; The datasheet gives no SOP-28 package drawing or pin-position diagram. Pin numbers are taken from th; Pin 13 (VLC) text says 'down 35dB when VLC=0.3dB'. This is taken as 0.3×VB, matching the recommended"
        ],
        "pages_sent": 13,
        "cost_usd": 0.0759,
        "at": "2026-10-18T09:57:34"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603078363569266688",
        "pages": 13,
        "sha256": "d61b3165690b111e",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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}