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TCA9555PWR Breakout
I2C 16-BIT I/O EXPANDER 400KHZ 24-TSSOP
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£5.29
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Design a Custom BoardAbout This Component
16-bit I/O expander providing parallel port expansion via I2C/SMBus interface for microcontrollers with limited GPIO. Operates at 1.65V to 5.5V with 5V-tolerant I/O ports, configurable polarity inversion, and open-drain interrupt output. Ideal for servers, routers, industrial automation, and systems requiring remote GPIO expansion.
Package: TSSOP-24 (4.4×7.8mm) · 24 pins
Why does this need a breakout?
Hand-soldering 0.65mm pitch traces is difficult without proper equipment; a breakout board with standard 0.1in header spacing lets you breadboard-prototype and test these compact devices easily. Commonly used for I2C/SMBus I/O expanders and mixed-signal microcontrollers, this breakout eliminates fine-pitch soldering and allows rapid iteration during development.
Component specifications
ELECTRICAL CHARACTERISTICS
| Manufacturer | Texas Instruments |
| Part Number | TCA9555PWR |
| Package | TSSOP-24 (4.4×7.8mm) |
| Pin Count | 24 |
| Clock Frequency | 400 kHz |
| Interface | I2C, SMBus |
| Number of I/O | 16 |
| Output Type | Push-Pull |
| Voltage - Supply | 1.65V ~ 5.5V |
What's Included
BILL OF MATERIALS
- 1x TCA9555PWR 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
WIDTH
< 0.9" (straddles breadboard)
PITCH
2.54mm standard
SOLDER
Lead-free, reflow assembled
FINISH
FR4, lead-free HASL