# RS2251XS16

**Jiangsu RUNIC Tech** · Analog Switches, Multiplexers · SOIC-16

RS2251XS16 from Jiangsu RUNIC Tech, in a SOIC-16. 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 | X4 | passive | Analog switch input X4; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 2 | X6 | passive | Analog switch input X6; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 3 | X | passive | Analog switch common output X; it connects to the selected channel X0-X7 as set by the A, B, C address inputs when ENABLE is low. |
| 4 | X7 | passive | Analog switch input X7; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 5 | X5 | passive | Analog switch input X5; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 6 | ENABLE | input | Digital enable input that is normally connected to GND; when it is high, no channel is turned on. |
| 7 | NC | unconnected | No connect. |
| 8 | GND | power_in | Ground; connect to digital ground. |
| 9 | C | input | Digital address C input used to select one of the eight analog channels. |
| 10 | B | input | Digital address B input used to select one of the eight analog channels. |
| 11 | A | input | Digital address A input used to select one of the eight analog channels. |
| 12 | X3 | passive | Analog switch input X3; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 13 | X0 | passive | Analog switch input X0; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 14 | X1 | passive | Analog switch input X1; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 15 | X2 | passive | Analog switch input X2; the input and output pins are identical and interchangeable, and signals pass equally well in either direction. |
| 16 | VCC | power_in | Positive analog and digital supply voltage input; the device operates from 2.5 V to 5.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOIC-16 |
| Category | Interface |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `RS2251XS16`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `rs2251xs16-etched.step` / `rs2251xs16-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs2251xs16.step` / `rs2251xs16.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588883666080026624) (13 pp, sha256 `6e58ff31b5a57ff3`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/rs2251xs16-datasheet.pdf)