{"product_id":"pcf8574-8-bit-i2c-io-expander-ic-chip-soic-16-5-pack","title":"PCF8574 8-Bit I2C I\/O Expander IC SOIC-16 – 5 Pack","description":"\u003ch2\u003ePCF8574 8-Bit I²C I\/O Expander IC – 5-Piece Set (SOIC-16)\u003c\/h2\u003e\n\u003cp\u003eExpand your microcontroller's GPIO capabilities with ease using the \u003cstrong\u003ePCF8574 8-Bit I\/O Expander IC\u003c\/strong\u003e. This 5-pack of brand-new SOIC-16 surface-mount chips allows you to add up to 8 additional general-purpose I\/O lines to any I²C-compatible system — perfect for Arduino, Raspberry Pi, and other embedded platforms.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8-Bit Parallel I\/O:\u003c\/strong\u003e Each chip provides 8 independently configurable input\/output lines via the I²C bus.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eI²C Interface:\u003c\/strong\u003e Simple 2-wire communication (SDA\/SCL) with up to 8 devices addressable on the same bus using address pins A0–A2.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSOIC-16 Package:\u003c\/strong\u003e Compact surface-mount form factor, ideal for PCB integration and space-constrained designs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Supply Voltage:\u003c\/strong\u003e Operates over a broad voltage range (2.5V–6V), compatible with 3.3V and 5V logic systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Standby Current:\u003c\/strong\u003e Energy-efficient design with minimal quiescent current draw.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupt Output:\u003c\/strong\u003e Active-low interrupt line notifies the host controller of input state changes without continuous polling.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Pack of 5 — ideal for prototyping, projects, or stocking your workshop bench.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new, authentic components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eExpanding GPIO on Arduino, ESP32, Raspberry Pi, and other microcontrollers\u003c\/li\u003e\n  \u003cli\u003eLCD and LED display driving via I²C backpack modules\u003c\/li\u003e\n  \u003cli\u003eKeypad matrix and button input interfacing\u003c\/li\u003e\n  \u003cli\u003eIndustrial control panels and relay driver boards\u003c\/li\u003e\n  \u003cli\u003eSensor hub and multi-device I²C bus expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePCF8574T\/3,518\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSOIC-16\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eI²C (2-wire)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eI\/O Lines\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8-bit parallel\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5V – 6V\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\u003eHigh-Concern Chemicals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 PCS\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\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cp\u003eLooking for more electronics and tools? Check out these store favourites:\u003c\/p\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\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the PCF8574 I²C I\/O Expander IC used for?\u003c\/h4\u003e\n\u003cp\u003eA: The PCF8574 is an 8-bit general-purpose I\/O expander that communicates over the I²C bus. It is widely used to add more input\/output lines to microcontrollers like Arduino, ESP32, and Raspberry Pi — enabling control of LCD displays, keypads, relays, LEDs, and other peripherals without consuming extra GPIO pins on your main controller.\u003c\/p\u003e\n\u003ch4\u003eQ: How many PCF8574 chips can I connect on the same I²C bus?\u003c\/h4\u003e\n\u003cp\u003eA: Up to 8 PCF8574 devices can share the same I²C bus simultaneously. Each chip's I²C address is set using three hardware address pins (A0, A1, A2), giving 8 unique addresses and a total of up to 64 additional I\/O lines on a single bus.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the SOIC-16 package compatible with standard PCBs and breadboard adapters?\u003c\/h4\u003e\n\u003cp\u003eA: The SOIC-16 is a surface-mount package. While it cannot be inserted directly into a standard breadboard, it is easily used with SOIC-to-DIP adapter boards (widely available) or soldered directly onto a custom or pre-made PCB for a compact, reliable installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Are these chips new or refurbished?\u003c\/h4\u003e\n\u003cp\u003eA: All 5 chips in this pack are brand new components in original condition. They carry no high-concern chemicals and are sourced as genuine PCF8574T\/3,518 integrated circuits.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the PCF8574 I²C I\/O Expander IC used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The PCF8574 is an 8-bit general-purpose I\/O expander that communicates over the I²C bus. 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