{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574ADWRE4","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574ADWRE4","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574ADWRE4","factsUrl":"https://icboms.com/api/mcp/products/PCF8574ADWRE4","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574ADWRE4, 8-bit I²C GPIO expander, 100 kHz clock, push-pull outputs, 1 mA source / 25 mA sink per I/O, 2.5V–6V supply, -40°C to 85°C, 16-SOIC wide (7.50 mm), Tape & Reel.","salesMarkdown":"## 8-bit I²C GPIO expander in a wide SOIC-16 It communicates over the I²C interface at up to 100 kHz, with eight push-pull I/O pins that can sink 25 mA or source 1 mA each. The wide 16-SOIC package (7.50 mm body width) suits designs where board space allows a larger footprint in exchange for easier hand-assembly or rework. A Power-On Reset (POR) feature ensures the outputs initialize to a known state at power-up. ## Supply range and drive capability Each I/O sinks 25 mA — enough to drive an LED directly or switch a small relay through a transistor — while the 1 mA source current handles logic-level inputs on the host side. For new designs or BOM lines that need a current-production part, the PCF8574A family (same base product number PCF857) offers the same I²C GPIO expander function with an alternate I²C slave address range, allowing up to eight devices on the same bus versus the PCF8574's eight.","metaTitle":"PCF8574ADWRE4 I2C GPIO Expander, 8-bit, 100 kHz, SOIC-16","metaDescription":"Texas Instruments PCF8574ADWRE4 8-bit I2C GPIO expander. 2.5V–6V supply, 25 mA sink, -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/PCF8574ADWRE4/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for PCF8574ADWRE4?","answer":"The PCF8574A series (e.g., PCF8574ADW, PCF8574APW) is the functional replacement. It is the same 8-bit I²C GPIO expander in the same package options but with a shifted I²C slave address range (0x38–0x3F vs 0x20–0x27), so the bus address must be updated in firmware. The pinout and electrical specs are otherwise identical."},{"question":"What are the differences between PCF8574 and PCF8574A?","answer":"The PCF8574 and PCF8574A are functionally identical 8-bit I²C GPIO expanders. The only difference is the I²C slave address range: the PCF8574 uses addresses 0x20–0x27, while the PCF8574A uses 0x38–0x3F. This allows both types to coexist on the same I²C bus without address conflicts, for up to 16 total expanders."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574ADWRE4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574ADWRE4 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}}