component
PCA9555DB
Public Made by Adomby adom
Texas Instruments I/O Expanders, SSOP-24-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownPCA9555DB
Texas Instruments · I/O Expanders · SSOP-24-208mil
PCA9555DB from Texas Instruments, in a SSOP-24-208mil. 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 | INT | output | Open-drain interrupt output asserting when input state differs from Input Port register; requires external pullup resistor to VCC. |
| 2 | A1 | input | Address input 1; connect to VCC or ground to set device slave address. |
| 3 | A2 | input | Address input 2; connect to VCC or ground to set device slave address. |
| 4 | P00 | bidirectional | I/O port pin 0.0 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 5 | P01 | bidirectional | I/O port pin 0.1 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 6 | P02 | bidirectional | I/O port pin 0.2 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 7 | P03 | bidirectional | I/O port pin 0.3 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 8 | P04 | bidirectional | I/O port pin 0.4 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 9 | P05 | bidirectional | I/O port pin 0.5 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 10 | P06 | bidirectional | I/O port pin 0.6 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 11 | P07 | bidirectional | I/O port pin 0.7 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 12 | GND | power_in | Ground; 0 V reference. |
| 13 | P10 | bidirectional | I/O port pin 1.0 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 14 | P11 | bidirectional | I/O port pin 1.1 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 15 | P12 | bidirectional | I/O port pin 1.2 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 16 | P13 | bidirectional | I/O port pin 1.3 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 17 | P14 | bidirectional | I/O port pin 1.4 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 18 | P15 | bidirectional | I/O port pin 1.5 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 19 | P16 | bidirectional | I/O port pin 1.6 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 20 | P17 | bidirectional | I/O port pin 1.7 with push-pull design structure; configurable as input or output; maximum 25 mA sink current per pin. |
| 21 | A0 | input | Address input 0; connect to VCC or ground to set device slave address. |
| 22 | SCL | bidirectional | Serial clock bus; open-drain output with external pullup resistor to VCC required; supports 100 kHz standard mode and 400 kHz fast mode. |
| 23 | SDA | bidirectional | Serial data bus; open-drain output with external pullup resistor to VCC required; supports 100 kHz standard mode and 400 kHz fast mode. |
| 24 | VCC | power_in | Supply voltage; rated 2.3 V to 5.5 V; bypass capacitor required for power supply filtering. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-24-208mil |
| Category | Communication Interface Chip/UART/485/232 |
| Pins | 24 |
CAD (KiCad official)
- Symbol:
PCA9555DB - Footprint:
Package_SO:SSOP-24_5.3x8.2mm_P0.65mm - 3D model: SSOP-24-208mil (KiCad packages3D, STEP)
- 3D model files:
pca9555db-etched.step/pca9555db-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pca9555db.step/pca9555db.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (49 pp, sha256
f82351ef5c7f9c9c, retrieved 2026-09-27, 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 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).