component
D3121F
Public Made by Adomby adom
Silicore Isolation Amplifiers, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+50@@ -0,0 +1,50 @@+# D3121F++**Silicore** · Isolation Amplifiers · SOP-8++D3121F from Silicore, 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) to the downstream power amplifier stage. Output is inverted with unity voltage gain (Gv = -0.04 dB typical) relative to IN1. |+| 2 | Vm1 | passive | 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. |+| 3 | IN1 | input | 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). |+| 4 | GND | power_in | 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. |+| 5 | IN2 | input | 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). |+| 6 | Vm2 | passive | 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. |+| 7 | OUT2 | output | 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. |+| 8 | Vcc | power_in | 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. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Silicore |+| Package | SOP-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## Ordering variants++- `D3121FF`+- `D3121F`+- `D3121FN`++## CAD (KiCad official)++- Symbol: `D3121F`+- 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:** [Silicore datasheet](docs/d3121f-datasheet.pdf) (None pp, sha256 `c9d5278c4698f7d7`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/d3121f-datasheet.pdf)
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