{"product_id":"pcf8574-i2c-io-expansion-board-io-expander-development-module","title":"PCF8574 I2C IO Expansion Board – I\/O Expander Dev Module","description":"\u003ch2\u003ePCF8574 I2C IO Expansion Board – I\/O Expander Development Module\u003c\/h2\u003e\n\u003cp\u003eExpand your microcontroller's GPIO capabilities with the \u003cstrong\u003ePCF8574 I2C IO Expansion Board\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eI2C Bus Interface:\u003c\/strong\u003e Communicates via standard I2C protocol — only 2 wires needed (SDA + SCL) to control up to 8 I\/O pins.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Compatibility:\u003c\/strong\u003e PCF8574 operates at 3.3V–5V; LCD1602 backpack support at 0.5V–6V.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature Range:\u003c\/strong\u003e Reliable performance from -40°C to +85°C — suitable for a broad range of environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD Package Design:\u003c\/strong\u003e Compact surface-mount construction for minimal board footprint.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug-and-Play with LCD1602:\u003c\/strong\u003e Perfect companion for driving LCD displays with minimal wiring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfigurable I2C Address:\u003c\/strong\u003e Address jumpers allow multiple modules on the same I2C bus.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupt Output:\u003c\/strong\u003e Provides an active-low interrupt signal to the host controller when input changes are detected.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBreadboard \u0026amp; PCB Friendly:\u003c\/strong\u003e Standard pin spacing for easy integration into prototypes and development setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePCF8574\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eI2C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage (PCF8574)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3V – 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage (LCD1602)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5V – 6V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSMD\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 Module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × PCF8574 I2C IO Expansion Board Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What microcontrollers are compatible with the PCF8574 I2C IO Expansion Board?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use multiple PCF8574 modules on the same I2C bus?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this module suitable for driving an LCD1602 display?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What microcontrollers are compatible with the PCF8574 I2C IO Expansion Board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use multiple PCF8574 modules on the same I2C bus?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The PCF8574 module includes address configuration jumpers (A0, A1, A2), allowing up to 8 different I2C addresses. 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