PCF8574 I2C I/O Expansion Module — 8-Channel GPIO Expander

PCF8574 I2C I/O Expansion Module — 8-Channel GPIO Expander

The PCF8574 I/O expansion module adds 8 additional digital I/O pins to any Arduino via just 2 I2C wires. With 3 address selection pins, up to 8 modules can be connected on a single I2C bus — expanding Arduino to 64 additional GPIO pins. Each pin can be independently configured as input or output. Commonly used to drive LCD displays via I2C.

Key Specifications

• IC: PCF8574 | Channels: 8 GPIO (input/output)
• Interface: I2C | Address range: 0x20–0x27 (3 address pins)
• Max modules per bus: 8 (64 total GPIO)
• Supply voltage: 2.5–6V | Output current: 25mA per pin
• Interrupt output: Yes (INT pin)
• Compliance: RoHS compliant

Why Choose This?

• ✅ 8 GPIO via 2 I2C wires — expand Arduino I/O without using digital pins
• ✅ 8 selectable addresses — stack up to 8 modules for 64 extra GPIO
• ✅ Interrupt output — wake Arduino on input change
• ✅ LCD I2C backpack compatible — standard chip for I2C LCD adapters

Typical Applications

• Arduino GPIO expansion for large projects
• I2C LCD display backpack driver
• Keypad and button matrix scanning
• LED array and relay bank control

Enjoy free standard shipping on all orders over $199 USD. Orders are processed within 1–2 business days.

Not satisfied? Return any item within 90 days of purchase for a full refund or exchange. Items must be in original condition.

We are committed to quality, reliability, and customer satisfaction. Every product is carefully selected and tested to meet the highest standards.