PCA9555D 16-bit I²C GPIO Expander IC, SOP-24
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Prices updated: 12 Oct 2026
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About this product
The PCA9555D from NXP adds 16 general-purpose I/O pins to a microcontroller over a two-wire I²C bus. It has two 8-bit ports that can each be set as inputs or outputs, an interrupt output, and address pins that let several devices share one bus.
Specifications
- Interface
- I²C (up to 400 kHz)
- GPIO pins
- 16 (two 8-bit ports)
- Supply voltage
- 2.3 V to 5.5 V
- Interrupt output
- Yes
- Package
- SOP-24
Frequently asked questions
How do I wire it to an Arduino or ESP32?
Connect VDD, GND, SDA and SCL. Add pull-up resistors on SDA and SCL, commonly 4.7 kΩ to VDD, if your module does not have them. Set the I²C address with A0 to A2 tied to GND or VDD.
Can it work with 3.3 V systems?
Yes. The 2.3 V to 5.5 V supply range covers 3.3 V systems. Make sure the SDA and SCL pull-ups connect to the same supply as the chip.
