{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574AN","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574AN","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574AN","factsUrl":"https://icboms.com/api/mcp/products/PCF8574AN","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574AN, 8-bit I²C I/O expander, 100 kHz clock, 2.5 V to 6 V supply, push-pull outputs, 1 mA source / 25 mA sink, interrupt output, -40°C to 85°C, 16-DIP (0.300\", 7.62 mm), through-hole.","salesMarkdown":"It provides eight general-purpose I/O pins controlled over a 100 kHz I²C bus, with push-pull outputs rated for 1 mA source and 25 mA sink per pin. The part includes a power-on reset (POR) feature and a dedicated interrupt output (INT) that asserts when an input changes state, allowing the host controller to poll only on demand. ## 100 kHz I²C bus and 25 mA sink — sizing the load and the pull-ups The I²C interface runs at 100 kHz standard mode. For a bus with multiple expanders or other 100 kHz slaves, the total bus capacitance stays under the 400 pF limit for standard-mode timing. The 1 mA source current is lower — if sourcing to a logic input, confirm the input high threshold is met at 1 mA; for driving loads that require sourcing, use an external pull-up to the supply rail or select a different output type. ## Interrupt output — saving host cycles on pin-change events The INT pin (open-drain, active low) pulls low whenever any I/O configured as an input changes from the state last read by the host. This lets the host MCU sleep or service other tasks until a button press, limit-switch closure, or sensor edge occurs. The interrupt is cleared when the host reads the input port via I²C. For battery-powered panels or multi-drop sensor arrays, this interrupt-driven scheme avoids constant polling over the bus. It is not nearing end-of-life, so production builds can be planned without LTB risk. The part is RoHS3 compliant. For dual-sourcing flexibility, the TCA9536ADTMR is a functional alternative but differs in package (surface-mount), output type (open-drain), and I/O count (4 vs 8) — verify the footprint and drive requirements before substituting.","metaTitle":"Texas Instruments PCF8574AN I²C I/O Expander, 8-Bit, 16-DIP","metaDescription":"PCF8574AN 8-bit I²C I/O expander in 16-DIP. 2.5V-6V supply, 100 kHz clock, 25 mA sink, interrupt output.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tube","Features":"POR","Interface":"I²C","Output Type":"Push-Pull","Mounting Type":"Through Hole","Number of I/O":"8","Package / Case":"16-DIP (0.300\\\", 7.62mm)","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-PDIP","Current - Output Source/Sink":"1mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.2500","priceTiers":[{"qty":1,"price":"$2.25000","currency":"USD"},{"qty":10,"price":"$2.01700","currency":"USD"},{"qty":25,"price":"$1.90280","currency":"USD"},{"qty":100,"price":"$1.62110","currency":"USD"},{"qty":250,"price":"$1.52216","currency":"USD"},{"qty":500,"price":"$1.33188","currency":"USD"},{"qty":1000,"price":"$1.10357","currency":"USD"},{"qty":2500,"price":"$1.07700","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/fb696dd34b280bb875ac664bb0ca53b4.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574AN/alternatives.json"},"ai":{"faq":[{"question":"Does PCF8574AN have an interrupt output?","answer":"Yes, the PCF8574AN includes a dedicated interrupt output (INT) that asserts when any input pin changes state. This allows the host controller to sleep or service other tasks until a pin-change event occurs."},{"question":"Is PCF8574AN a direct replacement for PCF8574AP?","answer":"The PCF8574AN and PCF8574AP share the same base product number (PCF8574) and functional description. Both are 8-bit I²C I/O expanders in 16-pin DIP packages. The suffix 'N' vs 'P' typically indicates packaging or temperature grade differences — verify the specific suffix against your BOM's operating temperature and package requirements before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574AN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574AN 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}}