# PCA9554ADBR

**Texas Instruments** · I/O Expanders · SSOP-16-208mil

PCA9554ADBR from Texas Instruments, in a SSOP-16-208mil. 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 | A0 | input | Address input. Connect directly to VCC or ground. |
| 2 | A1 | input | Address input. Connect directly to VCC or ground. |
| 3 | A2 | input | Address input. Connect directly to VCC or ground. |
| 4 | P0 | bidirectional | P-port input/output. Push-pull design structure. |
| 5 | P1 | bidirectional | P-port input/output. Push-pull design structure. |
| 6 | P2 | bidirectional | P-port input/output. Push-pull design structure. |
| 7 | P3 | bidirectional | P-port input/output. Push-pull design structure. |
| 8 | GND | power_in | Ground. |
| 9 | P4 | bidirectional | P-port input/output. Push-pull design structure. |
| 10 | P5 | bidirectional | P-port input/output. Push-pull design structure. |
| 11 | P6 | bidirectional | P-port input/output. Push-pull design structure. |
| 12 | P7 | bidirectional | P-port input/output. Push-pull design structure. |
| 13 | INT | output | Open-drain, active-low interrupt output. Connect to VCC through a pullup resistor. |
| 14 | SCL | input | Serial clock bus. Connect to VCC through a pullup resistor. |
| 15 | SDA | bidirectional | Serial data bus. Connect to VCC through a pullup resistor. |
| 16 | VCC | power_in | Supply voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-208mil |
| Category | Interface |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `PCA9554ADBR`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
- 3D model files: `pca9554adbr-etched.step` / `pca9554adbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pca9554adbr.step` / `pca9554adbr.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/pca9554a) (42 pp, sha256 `6104cd12b57d2d07`, retrieved 2026-10-08, 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-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/pca9554adbr-datasheet.pdf)