component
U4082BG-2
Public Made by Adomby adom
UTC Unisonic Tech Audio Amplifiers, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"slug": "u4082bg-2",
"title": "U4082BG-2",
"brief": "UTC Unisonic Tech Audio Amplifiers, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"u4082bg-2",
"factory-2.0.0",
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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": {
"symbol": "u4082bg-2.kicad_sym",
"footprint": "u4082bg-2.kicad_mod",
"model_3d": "u4082bg-2-hero.glb",
"model_3d_plain": "u4082bg-2-etched.glb",
"model_3d_step": "u4082bg-2-etched.step",
"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": {
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"pages": 13,
"sha256": "d61b3165690b111e",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 28,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
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"footprint": "viewers/footprint.html"
},
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2.666
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"zmin_mm": 0,
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"checked": "2026-10-18",
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},
{
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},
"metadata": {
"specs": {
"Manufacturer": "UTC Unisonic Tech",
"Package": "SOP-28",
"Category": "Amplifiers/Comparators",
"Pins": "28"
},
"characteristics": {
"version": 1,
"source": "datasheet",
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"rows": [
{
"name": "Supply Voltage",
"symbol": "VCC",
"kind": "absolute_maximum",
"unit": "V",
"min": -1,
"typ": null,
"max": 7,
"conditions": "TA=25°C; voltages referred to pin 22",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Voltage at Pin 3",
"symbol": "V3",
"kind": "absolute_maximum",
"unit": "V",
"min": -1,
"typ": null,
"max": null,
"conditions": "TA=25°C; referred to pin 22; max printed as VCC+1",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Voltage at Pin 12 (mute)",
"symbol": "V12",
"kind": "absolute_maximum",
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"max": null,
"conditions": "TA=25°C; referred to pin 22; max printed as VCC+1",
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{
"name": "Voltage at Pin 13 (VLC)",
"symbol": "V13",
"kind": "absolute_maximum",
"unit": "V",
"min": -1,
"typ": null,
"max": null,
"conditions": "TA=25°C; referred to pin 22; max printed as VCC+0.5",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Voltage at Pin 9, Pin 21, and Pin 2",
"symbol": "V9, 21, 2",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "TA=25°C; referred to pin 22; max printed as VCC+0.5",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Storage Temperature",
"symbol": "TSTR",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "TA=25°C; referred to pin 22",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Supply Voltage",
"symbol": "V4",
"kind": "recommended_operating",
"unit": "V",
"min": 3.5,
"typ": null,
"max": 6.5,
"conditions": "",
"source_page": 4,
"source": "datasheet"
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{
"name": "Voltage at Pin 3",
"symbol": "V3",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": null,
"conditions": "max printed as VCC",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Voltage at Pin 12 (MUTE)",
"symbol": "V12",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": null,
"conditions": "max printed as VCC",
"source_page": 4,
"source": "datasheet"
},
{
"name": "IVB Current (Pin 15)",
"symbol": "IVB",
"kind": "recommended_operating",
"unit": "µA",
"min": null,
"typ": null,
"max": 500,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Attenuator Input Signal Voltage at Pin 9, Pin 21",
"symbol": "V9, V21",
"kind": "recommended_operating",
"unit": "mVrms",
"min": null,
"typ": null,
"max": 350,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Load Current RXO, TXO (Pin8, Pin 22)",
"symbol": "",
"kind": "recommended_operating",
"unit": "mA",
"min": -2,
"typ": null,
"max": 2,
"conditions": "printed as 0~±2 mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Load Current MCO (Pin 10)",
"symbol": "",
"kind": "recommended_operating",
"unit": "mA",
"min": -1,
"typ": null,
"max": 1,
"conditions": "printed as 0~±1 mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Load Current HTO-, HTO+ (Pin 6, Pin 5)",
"symbol": "",
"kind": "recommended_operating",
"unit": "mA",
"min": -0.5,
"typ": null,
"max": 0.5,
"conditions": "printed as 0~±0.5 mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Ambient Operating Temperature",
"symbol": "TOPR",
"kind": "recommended_operating",
"unit": "°C",
"min": -20,
"typ": null,
"max": 60,
"conditions": "",
"source_page": 4,
"source": "datasheet"
},
{
"name": "V+ Supply Current",
"symbol": "ICC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 5.5,
"max": 8,
"conditions": "VCC=6.5V, CD=0.8V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "V+ Supply Current",
"symbol": "ICC",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 600,
"max": 800,
"conditions": "VCC=6.5V, CD=2V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "CD Input Resistance",
"symbol": "RCD",
"kind": "electrical",
"unit": "kΩ",
"min": 50,
"typ": 90,
"max": null,
"conditions": "VCC=VCD=6.5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "CD Input Voltage High",
"symbol": "VCDH",
"kind": "electrical",
"unit": "V",
"min": 2,
"typ": null,
"max": null,
"conditions": "max printed as VCC",
"source_page": 5,
"source": "datasheet"
},
{
"name": "CD Input Voltage Low",
"symbol": "VCDL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.8,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "VB Output Voltage",
"symbol": "VB",
"kind": "electrical",
"unit": "V",
"min": 1.3,
"typ": null,
"max": null,
"conditions": "VCC=3.5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "VB Output Voltage",
"symbol": "VB",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": 2.1,
"max": 2.4,
"conditions": "VCC=5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "VB Output Resistance",
"symbol": "ROVB",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": null,
"max": 400,
"conditions": "IVB=1mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "VB Power Supply Rejection Ratio",
"symbol": "PSRR",
"kind": "electrical",
"unit": "dB",
"min": 54,
"typ": null,
"max": null,
"conditions": "CVB=220µF, f=1kHz",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Receive Attenuator Gain",
"symbol": "GRX",
"kind": "electrical",
"unit": "dB",
"min": 4,
"typ": 6,
"max": 8,
"conditions": "RX Mode, RXI=150mVrms, VCC=5V, f=1kHz, VLC=VB",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Gain Change",
"symbol": "ΔGRX1",
"kind": "electrical",
"unit": "dB",
"min": -0.5,
"typ": 0,
"max": 0.5,
"conditions": "VCC=3.5V vs. VCC=5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "AGC Gain Change",
"symbol": "ΔGRX2",
"kind": "electrical",
"unit": "dB",
"min": -25,
"typ": -15,
"max": null,
"conditions": "VCC=3.5V vs. VCC=5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Idle Mode Receive Gain",
"symbol": "GRXI",
"kind": "electrical",
"unit": "dB",
"min": -22,
"typ": -20,
"max": -17,
"conditions": "Idle Mode, RXI=150mVrms",
"source_page": 5,
"source": "datasheet"
},
{
"name": "RX to TX Mode Range",
"symbol": "ΔGRX3",
"kind": "electrical",
"unit": "dB",
"min": 49,
"typ": 52,
"max": 54,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Volume Control Range",
"symbol": "VCR",
"kind": "electrical",
"unit": "dB",
"min": 27,
"typ": 35,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "ΔRXO DC Voltage",
"symbol": "ΔVRXO",
"kind": "electrical",
"unit": "mV",
"min": -150,
"typ": null,
"max": 150,
"conditions": "RX to TX Mode",
"source_page": 5,
"source": "datasheet"
},
{
"name": "RXO High Voltage",
"symbol": "VRXOH",
"kind": "electrical",
"unit": "V",
"min": 3.7,
"typ": null,
"max": null,
"conditions": "IOUT=-1mA, RXI=VB+1.5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "RXI Input Resistance",
"symbol": "RRXI",
"kind": "electrical",
"unit": "kΩ",
"min": 7,
"typ": 10,
"max": 14,
"conditions": "RXI<350mVrms",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Transmit Attenuator Gain",
"symbol": "GTX",
"kind": "electrical",
"unit": "dB",
"min": 4,
"typ": 6,
"max": 8,
"conditions": "TX Mode, TXI=150mVrms, f=1kHz",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Idle Mode Transmit Gain",
"symbol": "GTXI",
"kind": "electrical",
"unit": "dB",
"min": -22,
"typ": -20,
"max": -17,
"conditions": "Idle Mode, TXI=150mVrms",
"source_page": 5,
"source": "datasheet"
},
{
"name": "TX to Rx Mode Range",
"symbol": "ΔGTXI",
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