# GS8558-SR

**Gainsil** · Precision Op Amps · SOIC-8

GS8558-SR from Gainsil, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUTA | output | Channel A amplifier output with rail-to-rail swing. |
| 2 | INA- | input | Channel A inverting input; common-mode range extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). |
| 3 | INA+ | input | Channel A non-inverting input; common-mode range extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). |
| 4 | VSS | power_in | Negative supply (ground in single-supply operation); in dual-supply operation bypass with a 0.1uF ceramic capacitor. |
| 5 | INB+ | input | Channel B non-inverting input; common-mode range extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). |
| 6 | INB- | input | Channel B inverting input; common-mode range extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). |
| 7 | OUTB | output | Channel B amplifier output with rail-to-rail swing. |
| 8 | VDD | power_in | Positive supply, 2.5V to 5.5V (abs max 7.5V between VDD and VSS); bypass with a 0.1uF ceramic capacitor placed close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Gainsil |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Offset Voltage | VOS | -5 | 1 | 5 | μV | VCM = VS/2 | 4 |
| Common-Mode Rejection Ratio | CMRR | 100 | 120 |  | dB | VS = 5V, VCM = -0.1V to 5.1V | 4 |
| Open-Loop Voltage Gain | AOL | 100 | 130 |  | dB | Vs=5V, RL = 10kΩ, VCM = -0.1V to 5.1V | 4 |
| Common-Mode Voltage Range | VCM | -0.1 |  | 5.6 | V | VS = 5.5V | 4 |
| Input Offset Voltage Drift | ΔVOS/ΔT |  | 0.027 | 0.13 | μV/℃ |  | 4 |
| Output Voltage Swing from Rail, high | VOH | 4.99 | 4.998 |  | V | Vs=5V, RL = 100kΩ | 4 |
| Output Voltage Swing from Rail, low | VOL |  | 1 | 10 | mV |  | 4 |
| Output Voltage Swing from Rail, high | VOH | 4.95 | 4.98 |  | V | Vs=5V, RL = 10kΩ | 4 |
| Output Voltage Swing from Rail, low | VOL |  | 10 | 30 | mV |  | 4 |
| Operating Voltage Range |  | 2.5 |  | 5.5 | V |  | 4 |
| Power Supply Rejection Ratio | PSRR | 100 | 120 |  | dB | VS = +2.5V to +5.5V, VCM = +0.5V | 4 |
| Shutdown Current / Amplifier | IQ_SD |  | 1 | 5 | μA |  | 4 |
| Power Supply Voltage (VDD to Vss) |  | -0.5 |  | 7.5 | V |  | 3 |
| PDB Input Voltage |  |  |  | 7 | V |  | 3 |
| Operating Temperature Range |  | -40 |  | 125 | °C |  | 3 |
| Storage Temperature Range |  | -55 |  | 150 | °C |  | 3 |
| Junction Temperature |  |  |  | 160 | °C |  | 3 |
| Lead Temperature |  |  |  | 260 | °C | soldering, 10sec | 3 |
| ESD Susceptibility HBM |  |  |  | 4 | KV |  | 3 |
| ESD Susceptibility MM |  |  |  | 300 | V |  | 3 |
| Package Thermal Resistance, SOP-8 | θJA |  | 125 |  | °C/W | TA=+25℃ | 3 |

## CAD (KiCad official)

- Symbol: `GS8558-SR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `gs8558-sr-etched.step` / `gs8558-sr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gs8558-sr.step` / `gs8558-sr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Gainsil datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589808183436222464) (15 pp, sha256 `795e6422bca43143`, retrieved 2026-10-10, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/gs8558-sr-datasheet.pdf)