{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCA9539AHF,128","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"PCA9539AHF128","canonicalUrl":"https://icboms.com/nxp/PCA9539AHF128","factsUrl":"https://icboms.com/api/mcp/products/PCA9539AHF%2C128","rawCanonicalId":null},"summary":{"shortDescription":"NXP Semiconductors PCA9539AHF I²C/SMBus GPIO expander, 16 I/O push-pull, 400 kHz, 1.65-5.5 V, -40 to +85 °C, 24-HWQFN (4x4), Tape & Reel.","salesMarkdown":"## 16 I/O lines on a 400 kHz I²C bus The PCA9539AHF,128 is a 16-bit general-purpose I/O expander from NXP, controlled over an I²C or SMBus interface at up to 400 kHz. It gives a host microcontroller 16 additional push-pull I/O lines without burning extra GPIO pins — the I²C address is set by three hardware pins, so up to eight of these can share the same bus for 128 total I/O. Each I/O can source 10 mA or sink 25 mA, enough to drive an LED directly or switch a small-signal relay through a transistor. ## Supply flexibility and interrupt handling The part includes a Power-On Reset (POR) circuit — on power-up all I/O default to inputs, preventing uncontrolled output states during rail ramp. An open-drain interrupt output (INT) asserts when any input changes state from the last read. This lets the host sleep between events and wake only on a pin transition — useful for keypad scanning or sensor monitoring where polling the bus would waste power. ## Active production, ROHS3 compliant Supplied in Tape & Reel (TR) or Cut Tape (CT) for pick-and-place assembly. The 24-HWQFN is a standard JEDEC footprint; no special reflow profile beyond the standard lead-free temperature curve is required.","metaTitle":"PCA9539AHF,128 NXP I2C GPIO Expander, 16 I/O, 400 kHz","metaDescription":"NXP PCA9539AHF,128 I2C/SMBus GPIO expander with 16 push-pull I/O, 400 kHz clock, 1.65-5.5V supply, industrial temp, 24-HWQFN. Active production, ROHS3","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Features":"POR","Interface":"I²C, SMBus","Output Type":"Push-Pull","Mounting Type":"Surface Mount","Number of I/O":"16","Package / Case":"24-WFQFN Exposed Pad","Clock Frequency":"400 kHz","lifecycle_stage":"eol_hot","Interrupt Output":"Yes","Voltage - Supply":"1.65V ~ 5.5V","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"24-HWQFN (4x4)","Current - Output Source/Sink":"10mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.38","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.38000","currency":"USD"},{"qty":10,"price":"$2.13800","currency":"USD"},{"qty":25,"price":"$2.01680","currency":"USD"},{"qty":100,"price":"$1.71850","currency":"USD"},{"qty":250,"price":"$1.61356","currency":"USD"},{"qty":500,"price":"$1.41188","currency":"USD"},{"qty":1000,"price":"$1.16984","currency":"USD"},{"qty":2500,"price":"$1.08916","currency":"USD"},{"qty":6000,"price":"$1.04883","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a3e94b5b2fa076965c2bcbee6c7a4bab.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy PCA9539AHF,128 and get a price?","answer":"Submit an RFQ for a firm price and lead time."},{"question":"What package does the PCA9539AHF,128 come in?","answer":"It is supplied in a 24-WFQFN with exposed pad, also designated as 24-HWQFN (4x4 mm)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/PCA9539AHF128","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/PCA9539AHF128 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}