D3121F

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  "type": "component",
  "slug": "d3121f",
  "title": "D3121F",
  "brief": "Silicore Isolation Amplifiers, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "op-amp-cmp",
    "d3121f"
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  "component": {
    "mpn": "D3121F",
    "manufacturer": "Silicore",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Op-amp/Cmp",
    "subcategory": "Isolation Amplifiers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/706f2d7c9fd2569ee928c9e4bd978c8c.pdf",
    "parts": {
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      "footprint": "d3121f.kicad_mod",
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      "lbr": "d3121f.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "OUT1",
        "type": "output",
        "description": "Channel 1 audio output. AC-coupled (typ. 4.7 uF) to the downstream power amplifier stage. Output is inverted with unity voltage gain (Gv = -0.04 dB typical) relative to IN1."
      },
      {
        "number": "2",
        "name": "Vm1",
        "type": "passive",
        "description": "Channel 1 mid-bias / ripple-filter node. An external electrolytic capacitor (typ. 22 uF) is connected from this pin to GND to set the internal bias reference and stabilize ripple rejection. The Vm1:Vm2 external cap ratio should be kept at 2:1 for stable ripple rejection."
      },
      {
        "number": "3",
        "name": "IN1",
        "type": "input",
        "description": "Channel 1 audio signal input from the tape deck / tuner. AC-coupled through an external electrolytic capacitor (typ. 4.7 uF). Input resistance RIN = 55 kΩ typical (44-66 kΩ)."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Signal / device ground reference. Connected to the car-body / chassis ground at the source-end (tape deck / tuner) side, exploiting the on-chip op-amp CMRR to cancel body-noise voltage between the two ground references."
      },
      {
        "number": "5",
        "name": "IN2",
        "type": "input",
        "description": "Channel 2 audio signal input from the tape deck / tuner. AC-coupled through an external electrolytic capacitor (typ. 4.7 uF). Input resistance RIN = 55 kΩ typical (44-66 kΩ)."
      },
      {
        "number": "6",
        "name": "Vm2",
        "type": "passive",
        "description": "Channel 2 mid-bias / ripple-filter node. An external electrolytic capacitor (typ. 10 uF) is connected from this pin to GND. The Vm1:Vm2 external cap ratio should be kept at 2:1 (e.g. 22 uF : 10 uF) for stable ripple rejection."
      },
      {
        "number": "7",
        "name": "OUT2",
        "type": "output",
        "description": "Channel 2 audio output. AC-coupled (typ. 4.7 uF) to the downstream power amplifier stage. Output is inverted with unity voltage gain (Gv = -0.04 dB typical) relative to IN2."
      },
      {
        "number": "8",
        "name": "Vcc",
        "type": "power_in",
        "description": "Positive supply voltage. Recommended operating range 4-18 V (typ. 12 V); absolute maximum 18 V. Quiescent current IQ = 9 mA typ. (5.6-14 mA). Bypass with a 47 Ω series resistor and 220 uF electrolytic per the test/application circuit."
      }
    ],
    "provenance": {
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        "url": "https://datasheet.lcsc.com/datasheet/pdf/706f2d7c9fd2569ee928c9e4bd978c8c.pdf",
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        "sha256": "c9d5278c4698f7d7",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Silicore",
      "Package": "SOP-8",
      "Category": "Op-amp/Cmp",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
        {
          "name": "Supply voltage",
          "symbol": "Vcc",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 18,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation (D3121F)",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 450,
          "conditions": "Ta=25C; reduce 4.5mW per C above 25C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature",
          "symbol": "Topr",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -30,
          "typ": null,
          "max": 85,
          "conditions": "",
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        {
          "name": "Storage temperature",
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          "unit": "C",
          "min": -55,
          "typ": null,
          "max": 125,
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        {
          "name": "Supply voltage",
          "symbol": "Vcc",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4,
          "typ": 12,
          "max": 18,
          "conditions": "Ta=25C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": 5.6,
          "typ": 9,
          "max": 14,
          "conditions": "VIN=0Vrms",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output noise voltage",
          "symbol": "VNO",
          "kind": "electrical",
          "unit": "μVrms",
          "min": null,
          "typ": 3.5,
          "max": 8,
          "conditions": "BPF=20Hz～20KHz",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Voltage gain",
          "symbol": "GV",
          "kind": "electrical",
          "unit": "dB",
          "min": -1.5,
          "typ": -0.04,
          "max": 1.5,
          "conditions": "Vo=-10dBm,Rg=0Ω",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum output voltage",
          "symbol": "VOM",
          "kind": "electrical",
          "unit": "Vrms",
          "min": 1.8,
          "typ": 2,
          "max": null,
          "conditions": "THD=0.1%,Vcc=8V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Total harmonic distortion",
          "symbol": "THD",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.002,
          "max": 0.02,
          "conditions": "Vo=0.7Vrms",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Common mode rejection ratio",
          "symbol": "CMRR",
          "kind": "electrical",
          "unit": "dB",
          "min": 41,
          "typ": 57,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Common mode voltage",
          "symbol": "VCM",
          "kind": "electrical",
          "unit": "Vrms",
          "min": 2.5,
          "typ": 3.75,
          "max": null,
          "conditions": "Vcc=8V,CMRR=40dB",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Ripple rejection ratio",
          "symbol": "RR",
          "kind": "electrical",
          "unit": "dB",
          "min": 72,
          "typ": 80,
          "max": null,
          "conditions": "fRR=100Hz, Rg=0Ω, VRR=-10dBm",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input resistance",
          "symbol": "RIN",
          "kind": "electrical",
          "unit": "KΩ",
          "min": 44,
          "typ": 55,
          "max": 66,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Channel separation",
          "symbol": "CS",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 82,
          "max": null,
          "conditions": "VIN=-10dBm, Rg=1.8KΩ/OPEN",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Slew rate",
          "symbol": "SR",
          "kind": "electrical",
          "unit": "V/μs",
          "min": null,
          "typ": 2,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
    }
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  "variants": [
    {
      "mpn": "D3121FF",
      "kind": "packaging"
    },
    {
      "mpn": "D3121F",
      "kind": "packaging"
    },
    {
      "mpn": "D3121FN",
      "kind": "packaging"
    }
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  "updated_at": "2026-09-24T19:37:51.001Z"
}