BA3123F-E2

@@ -0,0 +1,49 @@+# BA3123F-E2++**ROHM** · Audio Power OpAmps · SOP-8++BA3123F-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. AC-coupled (typ. 4.7 uF electrolytic) to the power amplifier input. Maximum output swing V_OM ~2.0 Vrms at V_CC = 8 V, THD = 0.1 %. |+| 2 | VM1 | passive | Channel 1 common-mode reference / noise-cancel input. External electrolytic capacitor (typ. 4.7 uF) to the source (tape deck/tuner) ground so the op-amp can subtract the car-body noise voltage from IN1. Larger caps here improve low-frequency CMRR (see Figure 10). |+| 3 | IN1 | input | Channel 1 audio input. AC-coupled (typ. 4.7 uF electrolytic) from the tuner/tape-deck output. Input resistance R_IN typ. 55 kOhm (44-66 kOhm). |+| 4 | GND | power_in | Ground reference for the IC. Tied to the local (power-amplifier / car body) ground; the isolation topology intentionally references the IC ground separately from the source ground. |+| 5 | IN2 | input | Channel 2 audio input. AC-coupled (typ. 4.7 uF electrolytic) from the tuner/tape-deck output. Input resistance R_IN typ. 55 kOhm (44-66 kOhm). |+| 6 | VM2 | passive | Channel 2 common-mode reference / noise-cancel input. External electrolytic capacitor (typ. 10 uF in the front-page circuit) to the source ground so the op-amp can subtract the car-body noise voltage from IN2. Cap value trades off low-frequency CMRR vs. board area. |+| 7 | OUT2 | output | Channel 2 audio output. AC-coupled (typ. 4.7 uF electrolytic) to the power amplifier input. Maximum output swing V_OM ~2.0 Vrms at V_CC = 8 V, THD = 0.1 %. |+| 8 | VCC | power_in | Positive supply. Recommended operating range 4 V to 18 V (typ. 12 V), absolute maximum 18 V. Quiescent current I_Q typ. 9.0 mA (max 14 mA). Bypass locally to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM |+| Package | SOP-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `BA3123F-E2`++## CAD (KiCad official)++- Symbol: `BA3123F-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/ba3123f-e2-datasheet.pdf) (15 pp, sha256 `7d7f8f0e50bbea12`, 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/ba3123f-e2-datasheet.pdf)

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