# PCA9555DWR

**Texas Instruments** · I/O Expanders · SOIC-24-300mil

PCA9555DWR from Texas Instruments, in a SOIC-24-300mil. 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 | INT | output | Interrupt output; connect to VCC through pullup resistor. |
| 2 | A1 | input | Address input 1; connect to VCC or ground. |
| 3 | A2 | input | Address input 2; connect to VCC or ground. |
| 4 | P00 | bidirectional | Port P00 input/output with push-pull structure. |
| 5 | P01 | bidirectional | Port P01 input/output with push-pull structure. |
| 6 | P02 | bidirectional | Port P02 input/output with push-pull structure. |
| 7 | P03 | bidirectional | Port P03 input/output with push-pull structure. |
| 8 | P04 | bidirectional | Port P04 input/output with push-pull structure. |
| 9 | P05 | bidirectional | Port P05 input/output with push-pull structure. |
| 10 | P06 | bidirectional | Port P06 input/output with push-pull structure. |
| 11 | P07 | bidirectional | Port P07 input/output with push-pull structure. |
| 12 | GND | power_in | Ground; negative supply rail. |
| 13 | P10 | bidirectional | Port P10 input/output with push-pull structure. |
| 14 | P11 | bidirectional | Port P11 input/output with push-pull structure. |
| 15 | P12 | bidirectional | Port P12 input/output with push-pull structure. |
| 16 | P13 | bidirectional | Port P13 input/output with push-pull structure. |
| 17 | P14 | bidirectional | Port P14 input/output with push-pull structure. |
| 18 | P15 | bidirectional | Port P15 input/output with push-pull structure. |
| 19 | P16 | bidirectional | Port P16 input/output with push-pull structure. |
| 20 | P17 | bidirectional | Port P17 input/output with push-pull structure. |
| 21 | A0 | input | Address input 0; connect to VCC or ground. |
| 22 | SCL | bidirectional | Serial clock bus; connect to VCC through pullup resistor. |
| 23 | SDA | bidirectional | Serial data bus; connect to VCC through pullup resistor. |
| 24 | VCC | power_in | Supply voltage; 2.3V to 5.5V operating range. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-24-300mil |
| Category | Interface |
| Pins | 24 |

## CAD (KiCad official)

- Symbol: `PCA9555DWR`
- Footprint: `Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm`
- 3D model: SOIC-24-300mil (KiCad packages3D, STEP)
- 3D model files: `pca9555dwr-etched.step` / `pca9555dwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pca9555dwr.step` / `pca9555dwr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/pca9555) (49 pp, sha256 `f82351ef5c7f9c9c`, retrieved 2026-10-05, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/pca9555dwr-datasheet.pdf)