{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574ADWRG4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574ADWRG4","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574ADWRG4","factsUrl":"https://icboms.com/api/mcp/products/PCF8574ADWRG4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574ADWRG4 I²C-bus I/O expander, 8 I/O, push-pull output, 100 kHz clock, 2.5V–6V supply, -40°C to 85°C, 16-SOIC (0.295\", 7.50mm width), Tape & Reel.","salesMarkdown":"It operates at a 100 kHz clock frequency, includes a power-on reset (POR) feature, and provides an interrupt output to alert the host of input changes. For a production BOM that already uses this part, the only reliable supply path is the independent market — surplus inventory, new-old-stock, or broker-sourced material. ## 8 I/O, 100 kHz, push-pull — the specs that matter for fit Eight I/O lines, each configurable as input or output, with a push-pull output stage that can source 1 mA or sink 25 mA per pin. The 100 kHz I²C clock is the standard-mode speed — fine for polling switches, reading sensors, or driving LEDs, but not for high-speed data streaming. The interrupt output (active-low) lets the host sleep between events, saving power in battery applications. ## 16-SOIC wide-body — field-swappable footprint The wide-body SOIC is easier to hand-solder or rework with a standard iron than narrow-body SOIC or QFN packages — good news if you are swapping this on a customer site without a hot-air station.","metaTitle":"Texas Instruments PCF8574ADWRG4 I²C GPIO Expander, 100 kHz","metaDescription":"Texas Instruments PCF8574ADWRG4 I²C-bus I/O expander with 8 push-pull outputs, 100 kHz clock, 2.5V–6V supply, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Interface & Transceivers"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR)","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":"Obsolete","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-SOIC","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/PCF8574ADWRG4/alternatives.json"},"ai":{"faq":[{"question":"Is PCF8574ADWRG4 equivalent to PCF8574?","answer":"The PCF8574 and PCF8574A are functionally identical — both are 8-bit I²C GPIO expanders with the same pinout, same 100 kHz clock, same supply range, and same output drive. The difference is the I²C slave address range: the PCF8574 uses addresses 0x20–0x27, while the PCF8574A uses 0x38–0x3F. The PCF8574ADWRG4 is the 'A' variant, so it responds to the 0x38–0x3F block. If your design already uses the non-A version, you cannot drop in this part without changing the address in firmware or hardware."},{"question":"What is the replacement for PCF8574ADWRG4?","answer":"There is no official TI successor listed for this specific order code. The closest functional replacement within the family is the PCF8574A (non-'DWR' suffix) in the same 16-SOIC package — it uses the same I²C address range (0x38–0x3F) and same pinout. For a drop-in replacement with identical address, check the PCF8574ADW (non-'R' suffix) if still available in surplus. Alternatively, the NXP PCA8574A is a pin-compatible second source with the same address map."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574ADWRG4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574ADWRG4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}