{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574ADW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574ADW","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574ADW","factsUrl":"https://icboms.com/api/mcp/products/PCF8574ADW","rawCanonicalId":null},"summary":{"shortDescription":"NXP PCF8574ADW, 8-bit I/O expander with I²C interface, 16-SOIC package, 100 kHz clock, 2.5V to 6V supply, push-pull outputs, interrupt output, -40°C to 85°C temperature range.","salesMarkdown":"## What this 8-bit I/O expander does on the bus The NXP PCF8574ADW is an 8-bit I/O expander controlled over an I²C bus at 100 kHz standard-mode clock speed. It gives a host microcontroller eight extra push-pull I/O lines without burning GPIO pins — useful when you've run out of port pins on a small MCU or need to drive a bank of LEDs, read switches, or control relays across a ribbon cable. Each I/O pin can sink up to 25 mA — enough to light an LED directly through a series resistor — or source 1 mA for logic-level signalling. The interrupt output (INT) pulls low when any input changes state, so the host doesn't have to poll the bus; it can sleep until a button press or sensor edge wakes it up. Power-on reset (POR) ensures the outputs start in a known-high state after the supply comes up. You'll find it in PLC I/O modules, HVAC controller boards, vending machines, and any equipment where a remote bank of I/O needs to talk back to a central processor over a two-wire bus. ## Sourcing reality — active, no last-time-buy pressure We source it through independent distribution and quote firm pricing and availability against an RFQ — no stock promises on the page, but a real quote when you ask.","metaTitle":"PCF8574ADW I²C I/O Expander, 8-Bit, 16-SOIC, -40°C to 85°C","metaDescription":"PCF8574ADW 8-bit I/O expander with I²C interface, push-pull outputs, interrupt output. Supply 2.5V-6V, 100 kHz clock, -40°C to 85°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tube","Features":"POR","Interface":"I²C","Output Type":"Push-Pull","Mounting Type":"Surface Mount","Number of I/O":"8","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","Product Status":"Active","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":"16-SOIC","Current - Output Source/Sink":"1mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.3400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/fb696dd34b280bb875ac664bb0ca53b4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574ADW/alternatives.json"},"ai":{"faq":[{"question":"Can PCF8574ADW work with 5V supply?","answer":"Yes — the supply range is 2.5 V to 6 V, so 5 V is right in the middle. It also works at 3.3 V, making it a single-BOM option for mixed-voltage systems without a level shifter."},{"question":"Does PCF8574ADW have an interrupt output?","answer":"Yes, the interrupt output (INT) is built in. It asserts low when any input pin changes state, letting the host MCU sleep or attend to other tasks instead of polling the I²C bus."},{"question":"What is the difference between PCF8574ADW and PCF8574AN?","answer":"The PCF8574ADW comes in a surface-mount 16-SOIC package, while the PCF8574AN is the DIP-16 through-hole variant. Electrically they are identical — same I²C address map, same 25 mA sink capability, same supply range. The choice is purely board assembly: reflow versus wave-solder or socket."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574ADW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574ADW 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}}