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PCA9538PWR Breakout
I/O EXPANDER 8-BIT I2C 400KHZ TSSOP16
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Design a Custom BoardAbout This Component
8-bit I/O expander with I2C/SMBus interface operating at 400kHz. Provides 8 independently programmable input/output pins accessible via 2-wire serial communication. Commonly used in embedded systems to extend microcontroller I/O capacity with minimal pin overhead. Includes input/output buffering and interrupt capability.
Package: TSSOP-16 (4.4×5mm) · 16 pins
Why does this need a breakout?
The 0.65mm pitch makes hand soldering difficult and error-prone; a breakout board lets you solder standard headers instead. This package hosts precision analog and mixed-signal ICs like DACs and ADCs that benefit from clean PCB layouts and decoupling placement. Prototyping becomes faster with breadboard-compatible pin headers, eliminating the need for a custom carrier PCB.
Component specifications
ELECTRICAL CHARACTERISTICS
| Manufacturer | Texas Instruments |
| Part Number | PCA9538PWR |
| Package | TSSOP-16 (4.4×5mm) |
| Pin Count | 16 |
| Clock Frequency | 400 kHz |
| Interface | I2C, SMBus |
| Number of I/O | 8 |
| Output Type | Push-Pull |
| Voltage - Supply | 2.3V ~ 5.5V |
What's Included
BILL OF MATERIALS
- 1x PCA9538PWR soldered onto breakout PCB
- Pin headers pre-soldered (2.54mm / 0.1" pitch)
- All IC pins broken out to 2.54mm headers
Breakout Board Design
PCB SPECIFICATIONS