{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574PWG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574PWG4","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574PWG4","factsUrl":"https://icboms.com/api/mcp/products/PCF8574PWG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574PWG4, 8-bit I²C I/O expander, 100 kHz clock, 2.5 V to 6 V supply, push-pull output, interrupt output, -40°C to 85°C, 20-TSSOP package.","salesMarkdown":"The I²C interface runs at 100 kHz standard mode, and the part includes an interrupt output that signals the host when an input changes — useful for keypads or sensor monitoring where you want to avoid polling. The 20-TSSOP package (4.40 mm wide) is a surface-mount footprint common in space-constrained PCBs. ## 1 mA source, 25 mA sink — the drive asymmetry matters The output stage can sink 25 mA per pin but source only 1 mA. For loads that need sourcing current (relay coils, small solenoids), you will want a transistor or MOSFET buffer. The strong sink is fine for driving open-drain buses or pulling down a line. ## Industrial temperature range — not for under-hood It is not qualified for automotive under-hood environments (125°C ambient) — if the design needs that, look at the AEC-Q100 graded PCF8574-Q1 variant.","metaTitle":"PCF8574PWG4 I²C I/O Expander, 8-Bit, 100 kHz, 20-TSSOP","metaDescription":"Texas Instruments PCF8574PWG4 8-bit I²C I/O expander with interrupt output, 2.5 V to 6 V supply, 100 kHz clock, 20-TSSOP package.","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/436451875093ef53a6afca337f2de9b8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574PWG4/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between PCF8574 and PCF8575?","answer":"The PCF8574 is an 8-bit I/O expander; the PCF8575 is a 16-bit version in a 24-pin package. Both use the same I²C protocol and supply range, but the PCF8575 gives you twice the I/O count at the cost of a larger footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574PWG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574PWG4 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}}