SC34018CP

{
  "slug": "sc34018cp",
  "version": "0.1.0",
  "type": "component",
  "description": "Silicore(芯谷) Audio Amplifiers, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
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    "amplifiers-comparators",
    "sc34018cp",
    "factory-2.0.0",
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  "dependencies": {},
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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": {
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      "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": {
        "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 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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        "pages": 13,
        "sha256": "a75824da5ac31a40",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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}