PCF8574 I2C IO Expansion Board – I/O Expander Dev Module
PCF8574 I2C IO Expansion Board – I/O Expander Dev Module
PCF8574 I2C IO Expansion Board – I/O Expander Development Module
Expand your microcontroller's GPIO capabilities with the PCF8574 I2C IO Expansion Board. This compact development module lets you add up to 8 additional digital I/O pins to your Arduino, Raspberry Pi, or other I2C-compatible platform using just two bus lines — SDA and SCL. Ideal for makers, hobbyists, and embedded systems developers who need more I/O without sacrificing valuable pins.
Key Features
- I2C Bus Interface: Communicates via standard I2C protocol — only 2 wires needed (SDA + SCL) to control up to 8 I/O pins.
- Wide Voltage Compatibility: PCF8574 operates at 3.3V–5V; LCD1602 backpack support at 0.5V–6V.
- Wide Operating Temperature Range: Reliable performance from -40°C to +85°C — suitable for a broad range of environments.
- SMD Package Design: Compact surface-mount construction for minimal board footprint.
- Plug-and-Play with LCD1602: Perfect companion for driving LCD displays with minimal wiring.
- Configurable I2C Address: Address jumpers allow multiple modules on the same I2C bus.
- Interrupt Output: Provides an active-low interrupt signal to the host controller when input changes are detected.
- Breadboard & PCB Friendly: Standard pin spacing for easy integration into prototypes and development setups.
Specifications
| Chip | PCF8574 |
| Interface | I2C |
| Supply Voltage (PCF8574) | 3.3V – 5V |
| Supply Voltage (LCD1602) | 0.5V – 6V |
| Operating Temperature | -40°C to +85°C |
| Package | SMD |
| Quantity | 1 Module |
| Condition | New |
| Country of Origin | Made in Mainland China |
What's in the Box?
- 1 × PCF8574 I2C IO Expansion Board Module
Who Is This For?
This module is ideal for Arduino enthusiasts, electronics students, embedded systems engineers, and DIY project builders who want to extend I/O capability without complex hardware additions. Whether you're driving an LCD, reading multiple buttons, or managing relays — this board gives you the flexibility you need.
Related Products You May Like
- Electromagnetic Induction Tester – Coil & Circuit Fault Detector
- Air Compressor Pressure Gauge 0-10/0-12/0-25 Bar | DIY Tool
Learn more: OSHA on personal protective equipment
Frequently Asked Questions
Q: What microcontrollers are compatible with the PCF8574 I2C IO Expansion Board?
A: The PCF8574 I2C IO Expansion Board is compatible with any microcontroller that supports the I2C protocol, including Arduino Uno, Arduino Mega, Arduino Nano, Raspberry Pi, ESP8266, ESP32, and most other I2C-capable development boards. Simply connect VCC, GND, SDA, and SCL to get started.
Q: Can I use multiple PCF8574 modules on the same I2C bus?
A: Yes! The PCF8574 module includes address configuration jumpers (A0, A1, A2), allowing up to 8 different I2C addresses. This means you can connect up to 8 PCF8574 IO Expansion Boards on a single I2C bus, giving you up to 64 additional I/O pins from just 2 data lines.
Q: Is this module suitable for driving an LCD1602 display?
A: Absolutely. The PCF8574 IO Expansion Board is widely used as an I2C backpack for LCD1602 displays, reducing the connection from 6–10 pins down to just 2 (SDA and SCL). It is fully compatible with standard LCD1602 libraries available for Arduino and similar platforms.