{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574APWG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574APWG4","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574APWG4","factsUrl":"https://icboms.com/api/mcp/products/PCF8574APWG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574APWG4, 8-bit I²C I/O expander, 100 kHz clock, 2.5V to 6V supply, push-pull outputs, interrupt output, 20-TSSOP package, -40°C to 85°C operating temperature.","salesMarkdown":"## 8-bit I²C I/O expander with a wide supply window It operates from a 2.5V to 6V supply, making it equally at home on a 3.3V MCU rail or a 5V legacy bus. The interrupt output (INT) signals the host when an input changes, saving the host from polling the bus — useful in low-power or latency-sensitive designs. The 2.5V to 6V supply range is the headline fit parameter. At 3.3V the part is fully 3.3V-logic compatible; at 5V it works with 5V logic without level shifting. This eliminates a common BOM headache when bridging a 3.3V MCU to a 5V peripheral bus. The output sink current is 25 mA per pin, enough to drive a standard LED or a small relay coil directly (through a series resistor). Source current is limited to 1 mA, so sourcing loads need a pull-up or a buffer.","metaTitle":"TI PCF8574APWG4 I²C I/O Expander, 8-Bit, 100 kHz, 20-TSSOP","metaDescription":"TI PCF8574APWG4 8-bit I²C I/O expander with 100 kHz clock, 2.5V-6V supply, push-pull outputs, interrupt output, -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":"20-TSSOP (0.173\\\", 4.40mm Width)","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-TSSOP","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/PCF8574APWG4/alternatives.json"},"ai":{"faq":[{"question":"Is PCF8574APWG4 compatible with 3.3V logic?","answer":"Yes. With a supply range of 2.5V to 6V, the part operates at 3.3V and its I²C and I/O pins are 3.3V-logic compatible. At 3.3V supply, the input thresholds meet standard 3.3V CMOS levels."},{"question":"Is PCF8574APWG4 compatible with 5V?","answer":"Yes. The 2.5V to 6V supply range includes 5V operation. At 5V supply, the I/O pins are 5V-logic compatible, and the I²C bus can be pulled up to 5V as long as the host controller also operates at 5V or uses level translation."},{"question":"What is the difference between PCF8574 and PCF8574A?","answer":"The PCF8574 and PCF8574A are functionally identical 8-bit I²C I/O expanders. The difference is the I²C slave address range: the PCF8574 uses addresses 0x20–0x27, while the PCF8574A uses 0x38–0x3F. This allows up to 16 of these expanders on the same I²C bus (eight of each type)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574APWG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574APWG4 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}}