component
PCA9557DR
Public Made by Adomby adom
Texas Instruments I/O Expanders, SOIC-16. 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
markdownPCA9557DR
Texas Instruments · I/O Expanders · SOIC-16
PCA9557DR from Texas Instruments, 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 | SCL | input | Serial clock bus; connect to VCC through pullup resistor. |
| 2 | SDA | bidirectional | Serial data bus; connect to VCC through pullup resistor. |
| 3 | A0 | input | Address input; connect directly to VCC or ground. |
| 4 | A1 | input | Address input; connect directly to VCC or ground. |
| 5 | A2 | input | Address input; connect directly to VCC or ground. |
| 6 | P0 | bidirectional | I/O port with high-impedance open-drain design structure; connect to VCC through pullup resistor. |
| 7 | P1 | bidirectional | I/O port with push-pull design structure. |
| 8 | GND | power_in | Ground. |
| 9 | P2 | bidirectional | I/O port with push-pull design structure. |
| 10 | P3 | bidirectional | I/O port with push-pull design structure. |
| 11 | P4 | bidirectional | I/O port with push-pull design structure. |
| 12 | P5 | bidirectional | I/O port with push-pull design structure. |
| 13 | P6 | bidirectional | I/O port with push-pull design structure. |
| 14 | P7 | bidirectional | I/O port with push-pull design structure. |
| 15 | RESET | input | Active-low reset input; connect to VCC through pullup resistor if no active connection is used. |
| 16 | VCC | power_in | Supply voltage. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Interface |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
PCA9557DR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
pca9557dr-etched.step/pca9557dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);pca9557dr.step/pca9557dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (47 pp, sha256
1f41dbe8f20f14a2, retrieved 2026-10-01, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).