PCF8574 I2C 8bit I/O Expander

Product detailed description

The PCF8574 is an inexpensive and reliable 8-bit input/output expander that communicates via the I2C bus. It allows easy expansion of the number of digital pins on microcontrollers such as Arduino, ESP32, STM32, or Raspberry Pi without the need for modifications to the main board. Each pin can be configured as an input or output and operate independently.

The device is equipped with an 8-bit quasi bidirectional I/O port (P0-P7), including latch outputs with high current supply for direct LED drive. Each quasi bidirectional I/O can be used as input or output without using a data direction signal.

Key features:

• 8 digital I/O pins (configurable as input or output)
• I2C address adjustable via 3 address pins (up to 8 devices on one bus)
• Low current consumption
• Suitable for reading buttons, controlling LEDs, relays, LCDs, etc.
• Compatible with 3.3V and 5V logic
• Many ready-made libraries available for Arduino and other platforms

Specifications:

• Chip: PCF8574
• Number of I/O pins: 8
• Communication interface: I2C (SCL, SDA)
• Operating voltage: 2.5 – 6 V
• Current per I/O pin: max. ±25 mA
• Addressing pins: A0, A1, A2 (8 addresses total)
• Header pitch: 2.54 mm (standard)
• Module dimensions: 47.6 × 15.24 mm

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustration purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.