{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574N","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574N","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574N","factsUrl":"https://icboms.com/api/mcp/products/PCF8574N","rawCanonicalId":null},"summary":{"shortDescription":"NXP PCF8574N, 8-bit I2C I/O expander, 100 kHz clock, 2.5V-6V supply, push-pull output, 1mA source / 25mA sink per pin, interrupt output, -40°C to 85°C, 16-DIP through-hole package.","salesMarkdown":"The NXP PCF8574N is an 8-bit I2C I/O expander in a 16-pin DIP package, designed to add remote GPIO to a microcontroller over a two-wire serial bus. It handles eight push-pull I/O lines that can be individually configured as inputs or outputs, with a dedicated interrupt output pin that signals the host when an input state changes. The 100 kHz I2C clock rate matches the original standard-mode specification, so it integrates cleanly into legacy or low-speed bus topologies without requiring clock-stretching support on the master side. The output stage sinks 25 mA per pin but sources only 1 mA — a common asymmetry in this expander family. For inputs, the port read-back works with open-drain or push-pull signals as long as the voltage stays within the supply rails. ## Package and mounting — through-hole for retrofit and prototyping The 16-DIP (0.300\" body width) and 16-PDIP supplier package are the same footprint — a 300-mil wide through-hole DIP. This is the package that fits a breadboard, a perforated prototyping board, or a legacy PCB originally laid out for a 74HC595 or similar parallel expander. The through-hole body also handles moderate vibration environments better than a fine-pitch SMD part when conformal-coated, though the industrial temperature rating (-40°C to 85°C) is the real environmental limit.","metaTitle":"PCF8574N I2C I/O Expander, 8-bit, 100 kHz, 16-DIP","metaDescription":"PCF8574N 8-bit I2C I/O expander in 16-DIP package. 100 kHz clock, 25 mA sink per pin, interrupt output, 2.5V-6V supply. Active lifecycle, industrial temp range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","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)","Product Status":"Active","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":"16-PDIP","Current - Output Source/Sink":"1mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.3400","priceTiers":[{"qty":1,"price":"$2.34000","currency":"USD"},{"qty":10,"price":"$2.10400","currency":"USD"},{"qty":25,"price":"$1.98480","currency":"USD"},{"qty":100,"price":"$1.69110","currency":"USD"},{"qty":250,"price":"$1.58788","currency":"USD"},{"qty":500,"price":"$1.38940","currency":"USD"},{"qty":1000,"price":"$1.15121","currency":"USD"},{"qty":2500,"price":"$1.12350","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/436451875093ef53a6afca337f2de9b8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574N/alternatives.json"},"ai":{"faq":[{"question":"Does the PCF8574N have an interrupt output?","answer":"Yes, the PCF8574N includes a dedicated interrupt output pin that asserts low when an input changes state, allowing the host MCU to avoid polling the I2C bus."},{"question":"What is the closest functional alternative to the PCF8574N?","answer":"The TCA9536ADTMR is a similar I2C I/O expander but with only 4 I/O lines, open-drain output, surface-mount packaging, a 1 MHz bus clock, and an extended temperature range to 125°C. The PCF8574N offers 8 I/O in a through-hole DIP with push-pull outputs, which the TCA9536 does not match."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574N 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}}