{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574ANG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574ANG4","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574ANG4","factsUrl":"https://icboms.com/api/mcp/products/PCF8574ANG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574ANG4, 8-bit I²C-bus I/O expander, 100 kHz clock, 2.5 V to 6 V supply, push-pull outputs, interrupt output, 16-PDIP package, -40°C to 85°C.","salesMarkdown":"## 8-bit I²C I/O expander for industrial and embedded systems The part includes a power-on reset (POR) feature and an interrupt output that signals the host when input states change, reducing polling overhead. ## Output drive and I²C bus considerations The 1 mA source and 25 mA sink per pin set the practical load limits: direct LED drive is fine with a series resistor, but driving a relay coil or small solenoid needs an external transistor or MOSFET. The I²C interface runs at 100 kHz (standard mode), which is adequate for polling inputs or latching outputs at human-scale rates. The interrupt output (active-low, open-drain) lets the host sleep between events, saving power in battery-backed designs. ## Package and mounting — through-hole for prototyping and legacy boards Housed in a 16-pin PDIP (0.300\" body width), the PCF8574ANG4 is through-hole mount, which simplifies hand-assembly, breadboarding, and rework. The DIP footprint is compatible with standard sockets, making it a practical choice for one-off builds, educational kits, or retrofitting older PCB designs that lack surface-mount pads.","metaTitle":"Texas Instruments PCF8574ANG4 I²C I/O Expander, 8-Bit","metaDescription":"Texas Instruments PCF8574ANG4: 8-bit I²C I/O expander, 100 kHz, 2.5V-6V, -40°C to 85°C, 16-PDIP. 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":"Through Hole","Number of I/O":"8","Package / Case":"16-DIP (0.300\\\", 7.62mm)","Clock Frequency":"100 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"Yes","Voltage - Supply":"2.5V ~ 6V","Base Product Number":"PCF857","Operating Temperature":"-40°C~85°C","Supplier Device Package":"16-PDIP","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/PCF8574ANG4/alternatives.json"},"ai":{"faq":[{"question":"Is PCF8574ANG4 a direct replacement for PCF8574P?","answer":"The PCF8574ANG4 and PCF8574P are functionally identical — both are 8-bit I²C I/O expanders in a 16-pin DIP package with the same I²C address range (0x20–0x27). The suffix differences (NG4 vs P) typically indicate packaging or lead-free finish variants; they are pin-compatible and can be swapped in most designs. Always confirm the specific suffix with the datasheet for any subtle differences in ordering code."},{"question":"Can PCF8574ANG4 be used with 3.3V logic?","answer":"Yes. The supply range is 2.5 V to 6 V, so 3.3 V operation is within spec. The I²C bus thresholds scale with VDD; at 3.3 V the logic-low and logic-high levels are compatible with standard 3.3 V MCUs. The 100 kHz I²C clock is also well within the margin for 3.3 V bus timing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574ANG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574ANG4 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}}