{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574RGTR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574RGTR","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574RGTR","factsUrl":"https://icboms.com/api/mcp/products/PCF8574RGTR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574RGTR, I2C I/O expander, 8-bit, 100 kHz clock, 2.5V-6V supply, push-pull outputs, interrupt output, 16-VQFN (3x3), -40°C to 85°C.","salesMarkdown":"It provides eight push-pull I/O lines that can be individually configured as inputs or outputs, controlled over a 100 kHz I²C bus. The part includes a POR (power-on reset) feature and an interrupt output pin, making it a standard choice for adding digital I/O to microcontrollers that have run out of pins — common in industrial control panels, sensor hubs, and embedded systems where the host MCU is already on the I²C bus. The wide range also covers battery-powered designs that drift down to 2.5 V and 5 V industrial rails that might run high. The I²C interface is standard-mode only at 100 kHz — fine for polling a few switches or LEDs, but not for high-speed data streaming. ## Output drive — what the 1 mA source / 25 mA sink means Each I/O pin can source 1 mA or sink 25 mA. The sink current is the practical figure for driving LEDs, relay coils through a transistor, or logic inputs. The 1 mA source limit means you are not driving a load directly from the high side — use an external pull-up or a PNP/NMOS if you need more than a few milliamps sourced. For a typical LED with a 2 V forward drop at 5 V supply, a 120 Ω resistor limits current to 25 mA, which the sink side handles cleanly. The 16-VQFN (3x3) has an exposed thermal pad underneath — the datasheet calls it 16-VFQFN Exposed Pad. That pad is soldered to the board for thermal and mechanical stability. Reworking this package needs a hot-air station with a fine nozzle; the QFN footprint is tight, and the pad under the part makes alignment critical. Not rated for extended automotive under-hood (125°C) or military, but fine for cabin or chassis-mount applications that stay within the range. ROHS3 compliant.","metaTitle":"Texas Instruments PCF8574RGTR I2C I/O Expander, 8-Bit","metaDescription":"PCF8574RGTR I2C I/O expander, 8-bit, 100 kHz, 2.5V-6V supply, -40°C to 85°C, 16-VQFN.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Interface & Transceivers"],"specifications":{"Mfr":"Texas Instruments","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"POR","Interface":"I²C","Output Type":"Push-Pull","Mounting Type":"Surface Mount","Number of I/O":"8","Package / Case":"16-VFQFN Exposed Pad","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-VQFN (3x3)","Current - Output Source/Sink":"1mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.9500","priceTiers":[{"qty":1,"price":"$1.95000","currency":"USD"},{"qty":10,"price":"$1.75300","currency":"USD"},{"qty":25,"price":"$1.65360","currency":"USD"},{"qty":100,"price":"$1.40890","currency":"USD"},{"qty":250,"price":"$1.32288","currency":"USD"},{"qty":500,"price":"$1.15752","currency":"USD"},{"qty":1000,"price":"$0.95909","currency":"USD"},{"qty":3000,"price":"$0.93600","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/436451875093ef53a6afca337f2de9b8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574RGTR/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy PCF8574RGTR and what is the price?","answer":"The PCF8574RGTR is available to order through independent distribution."},{"question":"Can I use PCF8574RGTR with a 5V microcontroller?","answer":"Yes. The supply range is 2.5 V to 6 V, so it runs directly from a 5 V rail and its I²C logic levels are compatible with 5 V microcontrollers without external level shifting."},{"question":"Does PCF8574RGTR have an interrupt output?","answer":"Yes, the PCF8574RGTR includes an interrupt output pin that asserts when an input changes state, allowing the host MCU to avoid polling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574RGTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574RGTR 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}}