component
MC34118G-S28-R
Public Made by Adomby adom
UTC(Unisonic Tech) Audio Power OpAmps, SOP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"manufacturer": "UTC(Unisonic Tech)",
"package": "SOP-28-300mil",
"pin_count": 28,
"category": "Amplifiers",
"subcategory": "Audio Power OpAmps",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/30d0e6540c4e42bab9bf6fc94281e40c.pdf",
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"pins": [
{
"number": "1",
"name": "FO",
"type": "output",
"description": "Output of the filter, with output impedance less than 50Ω."
},
{
"number": "2",
"name": "FI",
"type": "input",
"description": "Input of the filter, with input impedance less than 1MΩ."
},
{
"number": "3",
"name": "CD",
"type": "input",
"description": "Chip disable input: logic low below 0.8V sets normal operation and logic high above 2V disables the IC, with a nominal input impedance of 90 kΩ."
},
{
"number": "4",
"name": "VCC",
"type": "power_in",
"description": "Requires a supply voltage of +2.8V to +6.5V at 5mA, and an AGC circuit reduces receive attenuator gain by 25dB when VCC falls below 3.5V in receive mode."
},
{
"number": "5",
"name": "HTO+",
"type": "output",
"description": "Output of the second hybrid amplifier, whose gain is internally set 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 maximum signal level of 350 mVrms and input impedance of 10 kΩ."
},
{
"number": "10",
"name": "MCO",
"type": "output",
"description": "Output of the microphone amplifier, whose gain is set by external resistors, with load current of 0 to ±1 mA."
},
{
"number": "11",
"name": "MCI",
"type": "input",
"description": "Summing node input of the microphone amplifier, 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, with input impedance of 90 kΩ."
},
{
"number": "13",
"name": "VLC",
"type": "input",
"description": "Volume control input sensed with respect to VB, with recommended operating range 0.3×VB to VB."
},
{
"number": "14",
"name": "CT",
"type": "passive",
"description": "Sets the response time for switching modes through the RC network connected at this pin."
},
{
"number": "15",
"name": "VB",
"type": "power_out",
"description": "Outputs about Vcc/2 as the system AC ground that biases the volume control, and requires a filter capacitor."
},
{
"number": "16",
"name": "CPT",
"type": "passive",
"description": "Sets the time constant for the transmit background noise monitor through the RC at this pin."
},
{
"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, and also the input to the transmit background noise 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 maximum input level of 350 mVrms and input impedance of 10 kΩ."
},
{
"number": "22",
"name": "RXO",
"type": "output",
"description": "Output of the receive attenuator, with DC level 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, and also the input to the transmit background noise 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": "Sets the time constant for the receive background noise monitor through the RC at this pin."
},
{
"number": "28",
"name": "GND",
"type": "power_in",
"description": "Ground."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
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"primary_model": "claude-haiku-5-5",
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"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The datasheet lists the ordering code MC34118G-S28-R as SOP-28 tape and reel but does not state a 30; The PIN CONFIGURATION diagram on page 2 prints some names differently from the PIN DESCRIPTION table"
],
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"at": "2026-10-26T23:45:38"
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"sha256": "74431b3e974e485c",
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"cad": "KiCad official (CC-BY-SA 4.0)",
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