component
MC34018G-S28-R
Public Made by Adomby adom
UTC(Unisonic Tech) Audio Power OpAmps, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "MC34018G-S28-R",
"brief": "UTC(Unisonic Tech) Audio Power OpAmps, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"manufacturer": "UTC(Unisonic Tech)",
"package": "SOIC-28-300mil",
"pin_count": 28,
"category": "Amplifiers",
"subcategory": "Audio Power OpAmps",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/41152d8660bd4c4db726c8c16a6374af.pdf",
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"checked_at": "2026-10-22T22:17:02Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
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"pins": [
{
"number": "1",
"name": "RR",
"type": "passive",
"description": "A resistor to ground provides a reference current for the transmit and receive attenuators."
},
{
"number": "2",
"name": "RTX",
"type": "passive",
"description": "A resistor to ground sets the nominal transmit attenuator gain, which is inversely proportional to the RTX resistance."
},
{
"number": "3",
"name": "TXI",
"type": "input",
"description": "Transmit attenuator input with nominal input resistance of 5.0kΩ."
},
{
"number": "4",
"name": "TXO",
"type": "output",
"description": "Transmit attenuator output that drives the transmit level detector input and the external circuit driving the telephone line."
},
{
"number": "5",
"name": "TLI",
"type": "input",
"description": "Transmit level detector input; an ac-coupled external resistor sets the detection level, and a smaller resistor increases sensitivity to transmit channel signals."
},
{
"number": "6",
"name": "TLO",
"type": "output",
"description": "Transmit level detector output; external resistor and capacitor set the time the comparator holds transmit mode after speech ceases."
},
{
"number": "7",
"name": "RLI",
"type": "input",
"description": "Receive level detector input; an ac-coupled external resistor sets the detection level, and a smaller resistor increases sensitivity to receive channel signals."
},
{
"number": "8",
"name": "RLO",
"type": "output",
"description": "Receive level detector output; external resistor and capacitor set the time the comparator holds receive mode after speech ceases."
},
{
"number": "9",
"name": "MCI",
"type": "input",
"description": "Microphone amplifier input with nominal input impedance of 10kΩ and dc bias approximately equal to VB."
},
{
"number": "10",
"name": "MCO",
"type": "output",
"description": "Microphone amplifier output with internally set gain of 34dB (50V/V)."
},
{
"number": "11",
"name": "CP1",
"type": "passive",
"description": "A parallel resistor and capacitor to VCC holds a voltage corresponding to the background noise level, which the transmit detector compares with the CP2 speech signal."
},
{
"number": "12",
"name": "CP2",
"type": "passive",
"description": "A capacitor at this pin peak detects speech signals for comparison with the background noise level held at CP1."
},
{
"number": "13",
"name": "XDI",
"type": "input",
"description": "Input to the transmit detector system, ac coupled from the microphone amplifier output through an external resistor."
},
{
"number": "14",
"name": "SKG",
"type": "power_in",
"description": "High current ground pin for the speaker amplifier output stage, to be within 10mV of the ground voltage at pin 22."
},
{
"number": "15",
"name": "SKO",
"type": "output",
"description": "Speaker amplifier output that sources and sinks up to 100mA when ac coupled to the speaker, with internally set gain of 34dB (50V/V)."
},
{
"number": "16",
"name": "V+",
"type": "power_in",
"description": "Input DC supply voltage, required 6.0V to 11V (7.5V nominal) at 7.0mA, which can be powered from Tip and Ring via an ac decoupling inductor."
},
{
"number": "17",
"name": "AGC",
"type": "passive",
"description": "A capacitor to VB stabilizes the speaker amplifier gain control loop and sets its attack and decay time, with nominal internal resistance of 110kΩ."
},
{
"number": "18",
"name": "CS",
"type": "input",
"description": "Digital chip select input: logic 0 (<0.7V) enables the VCC regulator, logic 1 (>1.6V) selects standby drawing 0.5mA, open is logic 0, input impedance about 140kΩ, and input must not exceed 11V."
},
{
"number": "19",
"name": "SKI",
"type": "input",
"description": "Speaker amplifier input with nominal input impedance of 20kΩ."
},
{
"number": "20",
"name": "VCC",
"type": "power_out",
"description": "5.4V regulated output powering all circuits except the speaker amplifier output stage, up to 3.0mA for external circuitry, requires a filter capacitor."
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{
"number": "21",
"name": "VB",
"type": "power_out",
"description": "Output of approximately VCC/2 serving as analog ground, sourcing up to 1.5mA with 250 ohm output impedance, requires a filter capacitor."
},
{
"number": "22",
"name": "GND",
"type": "power_in",
"description": "Ground pin for the IC except the speaker amplifier."
},
{
"number": "23",
"name": "XDC",
"type": "passive",
"description": "Transmit detector output; a resistor and capacitor hold transmit mode during pauses, with nominal internal resistor of 2.6k ohms."
},
{
"number": "24",
"name": "VLC",
"type": "input",
"description": "Volume control input for receive mode volume control from a variable resistor slider; voltage should be less than or equal to VB."
},
{
"number": "25",
"name": "ACF",
"type": "passive",
"description": "Attenuator control filter; a capacitor here reduces noise transients when the attenuator switches attenuation level."
},
{
"number": "26",
"name": "RXO",
"type": "output",
"description": "Receive attenuator output, normally ac coupled to the speaker amplifier input."
},
{
"number": "27",
"name": "RXI",
"type": "input",
"description": "Receive attenuator input with nominal input resistance of 5.0kΩ."
},
{
"number": "28",
"name": "RRX",
"type": "passive",
"description": "A resistor to ground sets the nominal receive attenuator gain, which is directly proportional to the RRX resistance."
}
],
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"cost_usd": 0.1157,
"at": "2026-10-22T22:16:45"
},
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"Package": "SOIC-28-300mil",
"Category": "Amplifiers",
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"name": "V+ terminal voltage (pin 16)",
"symbol": "V+",
"kind": "absolute_maximum",
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"min": -1,
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"conditions": "TA=25C, referred to pin 22",
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"source": "datasheet"
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{
"name": "Storage temperature",
"symbol": "TSTG",
"kind": "absolute_maximum",
"unit": "C",
"min": -65,
"typ": null,
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"source_page": 5,
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{
"name": "V+ terminal voltage (pin 16)",
"symbol": "V+",
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{
"name": "Receive signal (pin 27)",
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"source_page": 5,
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{
"name": "Microphone signal (pin 9)",
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"kind": "recommended_operating",
"unit": "mVrms",
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"typ": null,
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"source_page": 5,
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{
"name": "Speaker amplifier ground (pin 14)",
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"kind": "recommended_operating",
"unit": "mVdc",
"min": -10,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "ICC (pin 20)",
"symbol": "ICC",
"kind": "recommended_operating",
"unit": "mA",
"min": 0,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "Ambient temperature",
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"unit": "C",
"min": -20,
"typ": null,
"max": 60,
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"source_page": 5,
"source": "datasheet"
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{
"name": "VCC voltage",
"symbol": "VCC",
"kind": "electrical",
"unit": "Vdc",
"min": 4.9,
"typ": 5.4,
"max": 5.9,
"conditions": "V+=7.5V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Line regulation",
"symbol": "VCCLN",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 65,
"max": 150,
"conditions": "6.5V<V+<11V",
"source_page": 5,
"source": "datasheet"
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{
"name": "Dropout voltage",
"symbol": "VD",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 80,
"max": 300,
"conditions": "V+=5.0V",
"source_page": 5,
"source": "datasheet"
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{
"name": "VB voltage",
"symbol": "VB",
"kind": "electrical",
"unit": "Vdc",
"min": 2.5,
"typ": 2.9,
"max": 3.3,
"conditions": "V+=7.5V",
"source_page": 5,
"source": "datasheet"
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{
"name": "V+ supply current",
"symbol": "IV+",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 9,
"conditions": "V+=11V, Pin 18=0.7V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "V+ supply current",
"symbol": "IV+",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": null,
"max": 800,
"conditions": "V+=11V, Pin 18=1.6V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Output resistance",
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"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": 6,
"max": 20,
"conditions": "ICC=3mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Receive attenuator gain",
"symbol": "GRX",
"kind": "electrical",
"unit": "dB",
"min": 2,
"typ": 6,
"max": 10,
"conditions": "1.0kHz",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Receive attenuator range (Rx to Tx modes)",
"symbol": "GRX",
"kind": "electrical",
"unit": "dB",
"min": 40,
"typ": 44,
"max": 48,
"conditions": "Rx Mode, Pin 24=VB, Pin 27=250mVrms",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Receive attenuator idle mode gain",
"symbol": "GRI",
"kind": "electrical",
"unit": "dB",
"min": -20,
"typ": -16,
"max": -12,
"conditions": "Idle Mode, Pin 27=250mVrms",
"source_page": 5,
"source": "datasheet"
},
{
"name": "RXO voltage (Rx mode)",
"symbol": "VRXO",
"kind": "electrical",
"unit": "mV",
"min": 1.8,
"typ": 2.3,
"max": 3.2,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Delta RXO voltage (switch from Rx to Tx mode)",
"symbol": "VRXO",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": null,
"max": 100,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RXO source current (Rx mode)",
"symbol": "IROXH",
"kind": "electrical",
"unit": "mA",
"min": 1,
"typ": 3,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RXI input resistance",
"symbol": "RRXI",
"kind": "electrical",
"unit": "kΩ",
"min": 3.5,
"typ": 5,
"max": 8,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Volume control range",
"symbol": "VCR",
"kind": "electrical",
"unit": "dB",
"min": 24.5,
"typ": 32.5,
"max": null,
"conditions": "Rx Attenuator Gain, Rx Mode, 0.6VB<Pin 24<VB",
"source_page": 6,
"source": "datasheet"
},
{
"name": "TXO voltage (Tx mode)",
"symbol": "VTXO",
"kind": "electrical",
"unit": "Vdc",
"min": 1.8,
"typ": 2.3,
"max": 3.2,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Delta TXO voltage (switch from Tx to Rx mode)",
"symbol": "VTXO",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": null,
"max": 100,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Transmit attenuator gain",
"symbol": "GTX",
"kind": "electrical",
"unit": "dB",
"min": 4,
"typ": 6,
"max": 8,
"conditions": "1.0kHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Transmit attenuator range (Tx to Rx mode)",
"symbol": "GTX",
"kind": "electrical",
"unit": "dB",
"min": 40,
"typ": 44,
"max": 48,
"conditions": "Tx Mode, Pin 3=250mVrms",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Transmit attenuator idle mode gain",
"symbol": "GTXI",
"kind": "electrical",
"unit": "dB",
"min": -16.5,
"typ": -13,
"max": -8.5,
"conditions": "Idle Mode, Pin 3=250mVrms",
"source_page": 6,
"source": "datasheet"
},
{
"name": "TXO source current (Tx mode)",
"symbol": "ISOURCE",
"kind": "electrical",
"unit": "mA",
"min": 1,
"typ": 3,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "TXO input resistance",
"symbol": "RIN",
"kind": "electrical",
"unit": "kΩ",
"min": 3.5,
"typ": 5,
"max": 8,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Speaker amp gain",
"symbol": "GSPK",
"kind": "electrical",
"unit": "dB",
"min": 33,
"typ": 34,
"max": 35,
"conditions": "Pin 19=20mVrms",
"source_page": 6,
"source": "datasheet"
},
{
"name": "SKI input resistance",
"symbol": "RIN",
"kind": "electrical",
"unit": "kΩ",
"min": 15,
"typ": 22,
"max": 37,
"conditions": "",
"source_page": 6,
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{
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