{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PCA9543APW,118","brand":"NXP Semiconductors","brandSlug":"nxp","productSlug":"PCA9543APW118","canonicalUrl":"https://icboms.com/nxp/PCA9543APW118","factsUrl":"https://icboms.com/api/mcp/products/PCA9543APW%2C118","rawCanonicalId":null},"summary":{"shortDescription":"NXP PCA9543APW,118 2-Channel I²C Multiplexer, 14-TSSOP, 2.3V–3.6V / 4.5V–5.5V supply, I²C interface, Surface Mount.","salesMarkdown":"## 2-channel I²C bus multiplexer in 14-TSSOP The NXP PCA9543APW,118 is a 2-channel I²C multiplexer that lets a single I²C master talk to two independent downstream buses, each with its own address space and pull-up configuration. It is housed in a 14-TSSOP package (4.40 mm width) for surface-mount assembly and is specified for industrial and consumer systems where an I²C bus needs to be split — for example, to isolate devices with conflicting addresses or to drive separate sensor clusters on long traces. This dual-range support means the same part can be used across mixed-voltage designs without a level translator on the multiplexer itself. ## Supply voltage — two operating windows The PCA9543APW,118 operates from either a 2.3 V–3.6 V rail or a 4.5 V–5.5 V rail. If your I²C bus runs at 3.3 V, the lower window covers it; if you are on a 5 V bus, the upper window applies. There is no overlap between the two ranges, so pick the supply that matches your bus voltage — the part will not work at 4.0 V. This is a common gotcha when migrating a 5 V legacy design to 3.3 V: the part itself handles it, but the supply must land cleanly in one of the two bands.","metaTitle":"NXP PCA9543APW,118 I²C Multiplexer, 2-Channel, 14-TSSOP","metaDescription":"NXP PCA9543APW,118 2-channel I²C multiplexer in 14-TSSOP. Supply 2.3V–3.6V or 4.5V–5.5V. Active lifecycle, 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)","Interface":"I²C","Applications":"2-Channel I²C Multiplexer","Mounting Type":"Surface Mount","Package / Case":"14-TSSOP (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.3V ~ 3.6V, 4.5V ~ 5.5V","Supplier Device Package":"14-TSSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.11","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.11000","currency":"USD"},{"qty":10,"price":"$1.89500","currency":"USD"},{"qty":25,"price":"$1.78840","currency":"USD"},{"qty":100,"price":"$1.52360","currency":"USD"},{"qty":250,"price":"$1.43056","currency":"USD"},{"qty":500,"price":"$1.25174","currency":"USD"},{"qty":1000,"price":"$1.03716","currency":"USD"},{"qty":2500,"price":"$0.96563","currency":"USD"},{"qty":5000,"price":"$0.92987","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/ec4f8b8ec2ddadffe7dbf368f13089e2.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does PCA9543APW,118 support both 3.3V and 5V?","answer":"Yes, but not simultaneously. The part has two distinct supply windows: 2.3 V–3.6 V covers 3.3 V operation, and 4.5 V–5.5 V covers 5 V operation. You select the appropriate rail for your bus voltage."},{"question":"What is the difference between PCA9543APW,118 and PCA9543AD,118?","answer":"Both are 2-channel I²C multiplexers from NXP with the same core function and supply ranges. The difference is the package: the PCA9543APW,118 comes in a 14-TSSOP (4.40 mm width), while the PCA9543AD,118 is in a 14-SOIC package. The TSSOP variant is narrower and suited for tighter PCB layouts."},{"question":"Does PCA9543APW require external pull-up resistors?","answer":"Yes. Like any I²C device, the PCA9543APW,118 needs external pull-up resistors on the SDA and SCL lines of both the upstream and downstream buses. The multiplexer itself does not include internal pull-ups."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/nxp/PCA9543APW118","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/nxp/PCA9543APW118 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}}