{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574ARGYRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574ARGYRG4","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574ARGYRG4","factsUrl":"https://icboms.com/api/mcp/products/PCF8574ARGYRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574ARGYRG4, an 8-bit I²C I/O expander with interrupt output, 100 kHz I²C, push-pull output, 2.5V-6V supply, -40°C to 85°C, 20-VQFN (3.5x4.5) package, Tape & Reel.","salesMarkdown":"## Eight more GPIOs over two wires It includes a POR (power-on reset) feature that initializes the outputs to a known state on power-up, and an interrupt output pin that signals the host when an input changes — useful for keypad scanning, sensor monitoring, or status LED control without wasting core GPIOs. The I²C interface runs at 100 kHz standard-mode, which is adequate for polling switches, reading simple sensors, or driving indicators at human-perceptible rates. ## Output current: sink vs source matters The output pins are rated for 1 mA source and 25 mA sink per pin. That 25:1 ratio means the part is designed to sink load — driving an LED with the anode to Vdd and the cathode through the expander pin is the natural hookup. If you need to source current to a load (e.g., driving a P-channel MOSFET gate or a relay coil referenced to ground), the 1 mA source limit will be the constraint. For typical indicator LEDs at 5–10 mA, the sink side works fine without external drivers. The 20-VQFN package with exposed pad (3.5x4.5 mm) needs a solid thermal via stitch under the pad if you're running near the 25 mA sink limit on multiple pins simultaneously; the pad also helps with mechanical stability in vibration-prone installations. The PCF8574ARGYRG4 is the Tape & Reel variant of the base PCF8574A family; the base PCF8574 (without the 'A' suffix) is a different I²C slave address range, so check your address map before substituting.","metaTitle":"Texas Instruments PCF8574ARGYRG4 I²C I/O Expander, 8-bit","metaDescription":"Texas Instruments PCF8574ARGYRG4 is an 8-bit I²C I/O expander with interrupt output. 2.5V-6V supply, industrial temp -40°C to 85°C, 20-VQFN package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR)","Features":"POR","Interface":"I²C","Output Type":"Push-Pull","Mounting Type":"Surface Mount","Number of I/O":"8","Package / Case":"20-VFQFN Exposed Pad","Clock Frequency":"100 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"Yes","Voltage - Supply":"2.5V ~ 6V","Base Product Number":"PCF8574","Operating Temperature":"-40°C~85°C","Supplier Device Package":"20-VQFN (3.5x4.5)","Current - Output Source/Sink":"1mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/fb696dd34b280bb875ac664bb0ca53b4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574ARGYRG4/alternatives.json"},"ai":{"faq":[{"question":"Is PCF8574ARGYRG4 a direct replacement for the original PCF8574?","answer":"No — the PCF8574A uses a different I²C slave address range (0x38–0x3F) than the original PCF8574 (0x20–0x27). They are pin-compatible and functionally identical, but the address difference means you must update the firmware address byte or change the address pin strapping when swapping one for the other."},{"question":"Does PCF8574ARGYRG4 have an interrupt output?","answer":"Yes, the INT pin is an open-drain active-low output that asserts when any input pin changes state. It stays low until the host reads the port via I²C. This allows the MCU to sleep until a button press or sensor edge wakes it, reducing system power draw."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574ARGYRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574ARGYRG4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}