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BA3121F-E2
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ROHM Audio Power OpAmps, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+47@@ -0,0 +1,47 @@+# BA3121F-E2++**ROHM** · Audio Power OpAmps · SOP-8++BA3121F-E2 from ROHM, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | OUT1 | output | Channel 1 audio output. Drives the power amplifier through a coupling capacitor (typ. 4.7 µF electrolytic). Ground-isolated version of the IN1 signal. |+| 2 | VM1 | passive | 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. |+| 3 | IN1 | input | Channel 1 audio input from the source (tape deck / tuner). AC-coupled via an external 4.7 µF capacitor. Typical input resistance 55 kΩ. |+| 4 | GND | power_in | Ground reference (car body ground on the source side). All internal circuitry is referenced to this pin. |+| 5 | IN2 | input | Channel 2 audio input from the source (tape deck / tuner). AC-coupled via an external 4.7 µF capacitor. Typical input resistance 55 kΩ. |+| 6 | VM2 | passive | 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. |+| 7 | OUT2 | output | Channel 2 audio output. Drives the power amplifier through a coupling capacitor (typ. 4.7 µF electrolytic). Ground-isolated version of the IN2 signal. |+| 8 | VCC | power_in | Positive power supply. Recommended operating range 4 V to 18 V (typ. 12 V), absolute maximum 18 V. Quiescent current ~9.0 mA typ. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM |+| Package | SOP-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## Ordering variants++- `BA3121F-E2`++## CAD (KiCad official)++- Symbol: `BA3121F-E2`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ROHM datasheet](docs/ba3121f-e2-datasheet.pdf) (15 pp, sha256 `a0c13e55a1f7debc`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ba3121f-e2-datasheet.pdf)
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