{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCF8574DGVR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"PCF8574DGVR","canonicalUrl":"https://icboms.com/texas-instruments/PCF8574DGVR","factsUrl":"https://icboms.com/api/mcp/products/PCF8574DGVR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments PCF8574DGVR, 8-bit I²C I/O expander, 100 kHz clock, 2.5V-6V supply, push-pull outputs, POR, interrupt output, -40°C to 85°C, 20-TFSOP package.","salesMarkdown":"## What this 8-bit I²C I/O expander does It handles the common need — adding digital I/O without burning pins on the main processor, especially in panel controls, sensor readouts, and status-LED banks where you need a handful of inputs or outputs but not a full port expander array. It runs on a 100 kHz I²C clock, which is the standard-rate mode, and talks to any host that supports basic I²C — no special protocol, no clock stretching required. The interface is straightforward: write to the output latch, read the input port. An interrupt output (active-low, open-drain) tells the host when an input changes, so you don't have to poll. Power-on reset (POR) is built in, so the outputs come up in a known high-impedance state — no glitching on power-up. Each I/O pin can source 1 mA and sink 25 mA. The sink capability is decent for driving LEDs directly (with a series resistor) or pulling a logic line low. The source side is weak — 1 mA won't light most LEDs to useful brightness. For outputs that need to drive high, you'll want an external pull-up or a transistor buffer. The push-pull output structure means you don't need external pull-ups for the outputs themselves, but the weak source current is the real constraint. ## Package and rework — 20-TFSOP The PCF8574DGVR comes in a 20-TFSOP package (4.40 mm wide, 0.173\" pitch). That's a fine-pitch small-outline package — not something you want to hand-solder with a fat iron. A hot-air station with a fine nozzle, some tack flux, and a steady hand will get it on and off without lifting pads. TFSOP is MSL-sensitive like any fine-pitch package. Not rated for under-hood or downhole use, but fine for the environments where you'd typically find an I²C bus running at 100 kHz.","metaTitle":"Texas Instruments PCF8574DGVR I²C I/O Expander, 8-Bit","metaDescription":"Texas Instruments PCF8574DGVR 8-bit I²C I/O expander with POR, 2.5V-6V supply, -40°C to 85°C range. 20-TFSOP package. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"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":"20-TFSOP (0.173\\\", 4.40mm Width)","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":"20-TVSOP","Current - Output Source/Sink":"1mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9360","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/436451875093ef53a6afca337f2de9b8.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PCF8574DGVR/alternatives.json"},"ai":{"faq":[{"question":"Can PCF8574DGVR be used with 3.3V microcontrollers?","answer":"Yes. The supply voltage range is 2.5V to 6V, so it works directly with 3.3V logic without a level shifter. The I²C bus also runs at 3.3V levels. Just make sure the pull-up resistors are sized for 3.3V operation."},{"question":"What is the difference between PCF8574DGVR 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 interface and 100 kHz clock, same supply range, same push-pull outputs. The PCF8575 gives you 16 I/Os at the cost of a larger footprint and a different I²C address range. If you need more than 8 bits, the PCF8575 is the natural step up."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/PCF8574DGVR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/PCF8574DGVR 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}}