{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCA9538APWJ","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"PCA9538APWJ","canonicalUrl":"https://icboms.com/nxp/PCA9538APWJ","factsUrl":"https://icboms.com/api/mcp/products/PCA9538APWJ","rawCanonicalId":null},"summary":{"shortDescription":"NXP PCA9538APWJ 8-bit I²C/SMBus I/O expander, 400 kHz, 1.65-5.5 V, push-pull outputs, POR, interrupt, -40 to 85°C, 16-TSSOP.","salesMarkdown":"## I/O expander for I²C bus — 8 GPIOs with interrupt The NXP PCA9538APWJ is an 8-bit I²C- and SMBus-compatible GPIO expander in a 16-TSSOP package. It provides eight push-pull I/O lines that can be configured as inputs or outputs, plus a dedicated interrupt output. The part operates from a 1.65 V to 5.5 V supply and communicates at clock frequencies up to 400 kHz. ## Output drive and direct LED control Each I/O pin can source 10 mA or sink 25 mA. That sink current is enough to light a standard indicator LED with a series resistor — no external transistor or driver IC for simple panel indicators. The push-pull output structure means no pull-up resistors needed on output pins; only the I²C bus lines (SCL, SDA) require external pull-ups per the I²C specification. ## Temperature grade and environment Rated for -40°C to 85°C, this part suits industrial control cabinets, outdoor telecom equipment, and factory-floor sensor hubs. It is not AEC-Q100 qualified, so it is not intended for under-hood automotive or engine-bay applications. The 16-TSSOP package (4.4 mm width) fits on compact PCBs where board area is tight. ## Lifecycle and sourcing There is no end-of-life notice, no last-time-buy window. For new designs, this part is a safe choice with no imminent obsolescence risk.","metaTitle":"NXP PCA9538APWJ I²C I/O Expander, 400 kHz, 16-TSSOP","metaDescription":"NXP PCA9538APWJ 8-bit I²C/SMBus I/O expander with POR, push-pull outputs, interrupt. 1.65-5.5V supply, 400 kHz clock, -40 to 85°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"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":"8","Package / Case":"16-TSSOP (0.173\\\", 4.40mm Width)","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":"16-TSSOP","Current - Output Source/Sink":"10mA, 25mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.75","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.75000","currency":"USD"},{"qty":10,"price":"$1.57200","currency":"USD"},{"qty":25,"price":"$1.48320","currency":"USD"},{"qty":100,"price":"$1.26370","currency":"USD"},{"qty":250,"price":"$1.18656","currency":"USD"},{"qty":500,"price":"$1.03822","currency":"USD"},{"qty":1000,"price":"$0.86025","currency":"USD"},{"qty":2500,"price":"$0.80092","currency":"USD"},{"qty":5000,"price":"$0.77126","currency":"USD"},{"qty":12500,"price":"$0.74159","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0641b4d5509a73f8eb03020930ce9a54.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is PCA9538APWJ compatible with 3.3V logic?","answer":"Yes. The supply range of 1.65 V to 5.5 V covers 3.3 V logic directly. The I²C bus operates at 3.3 V, and the I/O pins are 5.5 V tolerant, so the expander can interface with both 3.3 V and 5 V peripherals without level shifting."},{"question":"What is the closest pin-compatible alternative to PCA9538APWJ?","answer":"The PCA9538 series includes several package variants. The PCA9538PW (16-TSSOP) is the same die in the same footprint; the PCA9538BS (HVQFN) offers a smaller package. For a different feature set (e.g., open-drain outputs), look at the PCA9554 series, but verify the pinout and register map — they are not drop-in replacements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/PCA9538APWJ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/PCA9538APWJ 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}}