component

D3121F

Public Made by Adom

by adom

Silicore Isolation Amplifiers, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentop-amp-cmpd3121f
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Contents

README

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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

Same part, different packaging or reel option.

  • 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)
  • 3D model files: d3121f-etched.step / d3121f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); d3121f.step / d3121f.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Silicore datasheet (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