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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"component": {
"mpn": "MC34018G-S28-R",
"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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"lbr": "mc34018g-s28-r.lbr"
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"distributor_links": {
"lcsc": "C73283"
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"source": "Component Ocean /api/assign-pns",
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"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."
},
{
"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."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
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"primary_model": "claude-sonnet-5-5",
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"cost_usd": 0.1157,
"at": "2026-10-22T22:16:45"
},
"datasheet": {
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"pages": 8,
"sha256": "55ac3adfb572638e",
"source_tier": "mfr"
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