PCF8574-150MIL I2C 8-Bit I/O Expander IC SOP16
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Prices updated: 13 Oct 2026
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About this product
8-bit remote I/O expander controlled over I2C, adding eight general-purpose pins to a microcontroller that has few free GPIOs. It is commonly used to drive LEDs and relays or read switches while using only the two I2C bus lines. The package is a 150 mil narrow SOP16.
Specifications
- Interface
- I2C
- Number of I/O pins
- 8
- Supply voltage
- 2.5 V to 6 V
- I2C address range (PCF8574)
- 0x20 to 0x27
- Interrupt output
- Yes (INT)
- Package
- SOP16, 150 mil
Frequently asked questions
Can I use PCF8574 with both 3.3 V and 5 V boards?
Yes, the supply range is 2.5 V to 6 V. Connect the SDA and SCL pull-up resistors to the same logic level as the I2C bus of your microcontroller.
How do I set the I2C address and what is the difference with PCF8574A?
The A0, A1 and A2 pins set the lower three address bits, giving 0x20 to 0x27 when tied to GND or VDD. The PCF8574A variant uses the range 0x38 to 0x3F, so confirm the suffix before writing your code.
