# RS8558XK

**Jiangsu RUNIC Tech** · Precision OpAmps · SOP-8

RS8558XK from Jiangsu RUNIC Tech, 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 | OUTA | output | Output of amplifier A. Rail-to-rail output swing; typical short-circuit current 48mA. VOH within 2mV of V+ and VOL within 1mV of V- with RL=100kΩ. |
| 2 | -INA | input | Inverting input of amplifier A. Rail-to-rail input; common-mode range extends (V-)-0.2V to (V+)+0.2V. Input bias current typically 50pA. |
| 3 | +INA | input | Non-inverting input of amplifier A. Rail-to-rail input; common-mode range (V-)-0.2V to (V+)+0.2V. Input bias current typically 50pA. |
| 4 | V- | power_in | Negative supply rail (or ground for single-supply operation). Supply range +2.7V to +5.5V referenced to V+; absolute max V+ to V- is 7.0V. |
| 5 | +INB | input | Non-inverting input of amplifier B. Rail-to-rail input; common-mode range (V-)-0.2V to (V+)+0.2V. Input bias current typically 50pA. |
| 6 | -INB | input | Inverting input of amplifier B. Rail-to-rail input; common-mode range (V-)-0.2V to (V+)+0.2V. Input bias current typically 50pA. |
| 7 | OUTB | output | Output of amplifier B. Rail-to-rail output swing; typical short-circuit current 48mA. VOH within 2mV of V+ and VOL within 1mV of V- with RL=100kΩ. |
| 8 | V+ | power_in | Positive supply rail. Supply range +2.7V to +5.5V (single supply) or ±1.35V to ±2.75V (dual supply). Absolute max V+ to V- is 7.0V; quiescent current 650µA per amplifier (typ). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOP-8 |
| Category | Op-amp/Cmp |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `RS8558XK`
- `RS8558XKXM`

## CAD (KiCad official)

- Symbol: `RS8558XK`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `rs8558xk-etched.step` / `rs8558xk-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs8558xk.step` / `rs8558xk.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](docs/rs8558xk-datasheet.pdf) (13 pp, sha256 `c9d7ae209903208c`, retrieved 2026-08-17, tier: lcsc)
- **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/rs8558xk-datasheet.pdf)