BA3121F-E2

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  "title": "BA3121F-E2",
  "brief": "ROHM Audio Power OpAmps, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
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    "mpn": "BA3121F-E2",
    "manufacturer": "ROHM",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Op-amp/Cmp",
    "subcategory": "Audio Power OpAmps",
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    "pins": [
      {
        "number": "1",
        "name": "OUT1",
        "type": "output",
        "description": "Channel 1 audio output. Drives the power amplifier through a coupling capacitor (typ. 4.7 µF electrolytic). Ground-isolated version of the IN1 signal."
      },
      {
        "number": "2",
        "name": "VM1",
        "type": "passive",
        "description": "Channel 1 common-mode rejection setting/decoupling node. External capacitor to ground (typ. 22 µF) sets the CMRR performance for amplifier 1-A. Larger capacitance improves low-frequency CMRR."
      },
      {
        "number": "3",
        "name": "IN1",
        "type": "input",
        "description": "Channel 1 audio input from the source (tape deck / tuner). AC-coupled via an external 4.7 µF capacitor. Typical input resistance 55 kΩ."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (car body ground on the source side). All internal circuitry is referenced to this pin."
      },
      {
        "number": "5",
        "name": "IN2",
        "type": "input",
        "description": "Channel 2 audio input from the source (tape deck / tuner). AC-coupled via an external 4.7 µF capacitor. Typical input resistance 55 kΩ."
      },
      {
        "number": "6",
        "name": "VM2",
        "type": "passive",
        "description": "Channel 2 common-mode rejection setting/decoupling node, shared with the reference divider. External capacitor to ground (typ. 10 µF) sets CMRR performance for amplifier 2-A."
      },
      {
        "number": "7",
        "name": "OUT2",
        "type": "output",
        "description": "Channel 2 audio output. Drives the power amplifier through a coupling capacitor (typ. 4.7 µF electrolytic). Ground-isolated version of the IN2 signal."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply. Recommended operating range 4 V to 18 V (typ. 12 V), absolute maximum 18 V. Quiescent current ~9.0 mA typ."
      }
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        "described": 8,
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  "metadata": {
    "specs": {
      "Manufacturer": "ROHM",
      "Package": "SOP-8",
      "Category": "Op-amp/Cmp",
      "Pins": "8"
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    "characteristics": {
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          "name": "Power Supply Voltage",
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          "kind": "recommended_operating",
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          "typ": 12,
          "max": 18,
          "conditions": "Ta = 25C",
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        {
          "name": "Quiescent Current",
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          "name": "Output Noise Voltage",
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        {
          "name": "Voltage Gain",
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          "kind": "electrical",
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          "min": -1.5,
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          "name": "Maximum Output Voltage",
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          "name": "Total Harmonic Distortion",
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        {
          "name": "Common-mode Rejection Ratio",
          "symbol": "CMRR",
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          "typ": 57,
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          "name": "Input Resistance",
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  "updated_at": "2026-09-24T17:28:15.109Z"
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