component
SC34018CP
Public Made by Adomby adom
Silicore(芯谷) Audio Amplifiers, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"type": "component",
"slug": "sc34018cp",
"title": "SC34018CP",
"brief": "Silicore(芯谷) 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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"sc34018cp",
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"component": {
"mpn": "SC34018CP",
"manufacturer": "Silicore(芯谷)",
"package": "SOP-28",
"pin_count": 28,
"category": "Amplifiers/Comparators",
"subcategory": "Audio Amplifiers",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590918761996640256",
"parts": {
"symbol": "sc34018cp.kicad_sym",
"footprint": "sc34018cp.kicad_mod",
"model_3d": "sc34018cp-hero.glb",
"model_3d_plain": "sc34018cp-etched.glb",
"model_3d_step": "sc34018cp-etched.step",
"model_3d_step_plain": "sc34018cp.step",
"lbr": "sc34018cp.lbr"
},
"distributor_links": {
"lcsc": "C20883062"
},
"distributor_check": {
"checked_at": "2026-10-17T21:14:35Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "RR",
"type": "passive",
"description": "A resistor to ground provides the 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": "Input to the transmit attenuator, with nominal input resistance of 5.0kΩ."
},
{
"number": "4",
"name": "TXO",
"type": "output",
"description": "Output of the transmit attenuator that drives the transmit level detector and the external circuit driving the telephone line."
},
{
"number": "5",
"name": "TLI",
"type": "input",
"description": "Input of the transmit level detector, AC coupled through an external resistor that sets the detection level; decreasing the resistor increases sensitivity."
},
{
"number": "6",
"name": "TLO",
"type": "output",
"description": "Output of the transmit level detector, where an external resistor and capacitor set how long the system stays in transmit mode after speech ceases."
},
{
"number": "7",
"name": "RLI",
"type": "input",
"description": "Input of the receive level detector, AC coupled through an external resistor that sets the detection level; decreasing the resistor increases sensitivity."
},
{
"number": "8",
"name": "RLO",
"type": "output",
"description": "Output of the receive level detector, where an external resistor and capacitor set how long the system stays in receive mode after the receive signal 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 between this pin and Vcc hold a voltage corresponding to the background noise level, which the transmit detector compares with the speech signal from CP2."
},
{
"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, which should 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 100uA 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 of 6.0 to 11V (7.5V nominal) at 7.0mA, which can be powered from Tip and Ring if an AC decoupling inductor is used."
},
{
"number": "17",
"name": "AGC",
"type": "passive",
"description": "A capacitor from this pin to VB sets the attack and decay time of the speaker amplifier gain control loop, with internal resistance nominally 110kΩ."
},
{
"number": "18",
"name": "CS",
"type": "input",
"description": "Digital chip select input: below 0.7V enables the Vcc regulator, above 1.6V places the chip in standby drawing 0.5mA, and the input must not exceed 11V."
},
{
"number": "19",
"name": "SKI",
"type": "input",
"description": "Input to the speaker amplifier with nominal input impedance of 20kΩ."
},
{
"number": "20",
"name": "Vcc",
"type": "power_out",
"description": "A 5.4V regulated output that powers all circuits except the speaker amplifier output stage, rated for 3.0mA max external load and requiring a filter capacitor."
},
{
"number": "21",
"name": "VB",
"type": "power_out",
"description": "An output at approximately Vcc/2 serving as the analog ground, which can source up to 1.5mA external load with 250Ω output impedance and 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": "output",
"description": "Transmit detector output where a resistor and capacitor hold the transmit mode during pauses, with internal resistance nominally 2.6kΩ."
},
{
"number": "24",
"name": "VLC",
"type": "input",
"description": "Volume control input for receive mode, connected to a variable resistor slider, with voltage that must be less than or equal to VB."
},
{
"number": "25",
"name": "ACF",
"type": "passive",
"description": "Attenuator control filter where a connected capacitor reduces noise transients as the attenuation level switches."
},
{
"number": "26",
"name": "RXO",
"type": "output",
"description": "Output of the receive attenuator, normally AC coupled to the input of the speaker amplifier."
},
{
"number": "27",
"name": "RXI",
"type": "input",
"description": "Input of the receive attenuator 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",
"factory_chain": {
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"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 SOP28 pin connection figure (page 2) is an image with no text in the extraction; pin numbers and; The datasheet does not assign ERC types. Types for resistor/capacitor-only pins (RR, RTX, CP1, CP2, ; Package information lists SC34018CP as SOP28 (25/tube, 1000/reel), so the SOP28 pinout applies to th"
],
"pages_sent": 13,
"cost_usd": 0.0551,
"at": "2026-10-17T21:12:46"
},
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"sha256": "a75824da5ac31a40",
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 28,
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"metadata": {
"specs": {
"Manufacturer": "Silicore(芯谷)",
"Package": "SOP-28",
"Category": "Amplifiers/Comparators",
"Pins": "28"
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"characteristics": {
"version": 1,
"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",
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"name": "Line Regulation",
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"name": "Dropout Voltage",
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{
"name": "VB Voltage",
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"unit": "Vdc",
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"typ": 2.9,
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"conditions": "V+=7.5V",
"source_page": 6,
"source": "datasheet"
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{
"name": "Receive Attenuator Gain, Rx Mode",
"symbol": "GRX",
"kind": "electrical",
"unit": "dB",
"min": 2,
"typ": 6,
"max": 10,
"conditions": "Pin24=VB; Pin27=250mVrms",
"source_page": 6,
"source": "datasheet"
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{
"name": "Receive Attenuator Range, Rx to Tx Mode",
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{
"name": "Receive Attenuator Gain, Idle Mode",
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"unit": "dB",
"min": -20,
"typ": -16,
"max": -12,
"conditions": "Pin 27=250mVrms",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RXO Voltage (Rx Mode)",
"symbol": "VRXO",
"kind": "electrical",
"unit": "Vdc",
"min": 1.8,
"typ": 2.3,
"max": 3.2,
"conditions": "",
"source_page": 6,
"source": "datasheet"
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{
"name": "RXO Source Current (Rx Mode)",
"symbol": "IRXOH",
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"unit": "mA",
"min": 1,
"typ": null,
"max": 3,
"conditions": "",
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"source": "datasheet"
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{
"name": "RXI Input Resistance",
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"kind": "electrical",
"unit": "kΩ",
"min": 3.5,
"typ": 5,
"max": 8,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Volume Control Range (Rx Attenuator Gain, Rx Mode)",
"symbol": "VCR",
"kind": "electrical",
"unit": "dB",
"min": 24.5,
"typ": null,
"max": 32.5,
"conditions": "0.6VB<Pin 24<VB",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Transmit Attenuator Gain, Rx Mode",
"symbol": "GTX",
"kind": "electrical",
"unit": "dB",
"min": 4,
"typ": 6,
"max": 8,
"conditions": "Pin 3=250mVrms",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Transmit Attenuator Range, Rx to Tx Mode",
"symbol": "ΔGTX",
"kind": "electrical",
"unit": "dB",
"min": 40,
"typ": 44,
"max": 48,
"conditions": "Rx to Tx Mode",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Transmit Attenuator Gain, Idle Mode",
"symbol": "GTXI",
"kind": "electrical",
"unit": "dB",
"min": -16.5,
"typ": -13,
"max": -8.5,
"conditions": "Pin 3=250mVrms",
"source_page": 6,
"source": "datasheet"
},
{
"name": "TXO Voltage (Tx Mode)",
"symbol": "VTXO",
"kind": "electrical",
"unit": "Vd",
"min": 1.8,
"typ": 2.3,
"max": 3.2,
"conditions": "",
"source_page": 6,
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},
{
"name": "TXO Source Current (Tx Mode)",
"symbol": "ITXOH",
"kind": "electrical",
"unit": "mA",
"min": 1,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 6,
"source": "datasheet"
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{
"name": "TXI Input Resistance",
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"min": 3.5,
"typ": 5,
"max": 8,
"conditions": "",
"source_page": 6,
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{
"name": "Speaker Amp Gain",
"symbol": "GSPK",
"kind": "electrical",
"unit": "dB",
"min": 33,
"typ": 34,
"max": 35,
"conditions": "Pin19=20mVrms",
"source_page": 7,
"source": "datasheet"
},
{
"name": "SKI Input Resistance",
"symbol": "RSKI",
"kind": "electrical",
"unit": "kΩ",
"min": 15,
"typ": 22,
"max": 37,
"conditions": "Pin19=Cap Couple to GND",
"source_page": 7,
"source": "datasheet"
},
{
"name": "SKO Voltage",
"symbol": "VSKO",
"kind": "electrical",
"unit": "Vd",
"min": 2.4,
"typ": 3,
"max": 3.6,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Mike Amp Gain",
"symbol": "GMCI",
"kind": "electrical",
"unit": "dB",
"min": 32.5,
"typ": 34,
"max": 35,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Mike Amp Input Resistance",
"symbol": "RMCI",
"kind": "electrical",
"unit": "kΩ",
"min": 6.5,
"typ": 10,
"max": 16,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Transmit-Receive Switch Threshold",
"symbol": "ITH",
"kind": "electrical",
"unit": "μA",
"min": 0.8,
"typ": null,
"max": 1.2,
"conditions": "Ratio of ITLI to IRLI at 20μA to switch Tx-Rx comparator",
"source_page": 7,
"source": "datasheet"
},
{
"name": "CP2 Current Source",
"symbol": "ICP2",
"kind": "electrical",
"unit": "μA",
"min": 5,
"typ": 10,
"max": 13,
"conditions": "",
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"source": "datasheet"
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{
"name": "V+ Terminal Voltage (Pin 16)",
"symbol": "V+",
"kind": "recommended_operating",
"unit": "V",
"min": 6,
"typ": null,
"max": 11,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "CS (Pin 18)",
"symbol": "CS",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 11,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Icc (Pin 20)",
"symbol": "Icc",
"kind": "recommended_operating",
"unit": "mA",
"min": 0,
"typ": null,
"max": 3,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Receive Signal (Pin 27)",
"symbol": "",
"kind": "recommended_operating",
"unit": "mVrms",
"min": 0,
"typ": null,
"max": 250,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Microphones Signal (Pin 9)",
"symbol": "",
"kind": "recommended_operating",
"unit": "mVrms",
"min": 0,
"typ": null,
"max": 5,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Speaker Amp Ground (Pin 14)",
"symbol": "",
"kind": "recommended_operating",
"unit": "mVdc",
"min": -10,
"typ": null,
"max": 10,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Ambient Temperature",
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"kind": "recommended_operating",
"unit": "°C",
"min": -20,
"typ": null,
"max": 60,
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"source_page": 5,
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},
{
"name": "V+ Terminal Voltage (Pin 16)",
"symbol": "V+",
"kind": "absolute_maximum",
"unit": "V",
"min": -1,
"typ": null,
"max": 12,
"conditions": "Voltages referred to Pin 22, Ta=25°C",
"source_page": 4,
"source": "datasheet"
},
{
"name": "CS (Pin 18)",
"symbol": "CS",
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"unit": "V",
"min": -1,
"typ": null,
"max": 12,
"conditions": "Voltages referred to Pin 22, Ta=25°C",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Speaker Amp Ground (Pin 14)",
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"min": -1,
"typ": null,
"max": 3,
"conditions": "Voltages referred to Pin 22, Ta=25°C",
"source_page": 4,
"source": "datasheet"
},
{
"name": "VLC (Pin 24)",
"symbol": "VLC",
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"unit": "V",
"min": -1,
"typ": null,
"max": null,
"conditions": "Voltages referred to Pin 22, Ta=25°C",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Storage Temperature",
"symbol": "",
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