{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SI8641BA-B-IU","brand":"Skyworks Solutions","brandSlug":"skyworks","productSlug":"SI8641BA-B-IU","canonicalUrl":"https://icboms.com/skyworks/SI8641BA-B-IU","factsUrl":"https://icboms.com/api/mcp/products/SI8641BA-B-IU","rawCanonicalId":null},"summary":{"shortDescription":"Skyworks Solutions Si864x series, General Purpose digital isolator, SI8641BA-B-IU, 150Mbps data rate, 4 channels, 1000Vrms isolation, 16-SSOP/QSOP package, -40°C to 125°C.","salesMarkdown":"## Active production — design-in ready The SI8641BA-B-IU: The 16-QSOP body is lead-free and compatible with standard reflow profiles. ## Parametric fit — what 150Mbps and 13ns mean on your bus Rated 150Mbps data rate with 13ns max propagation delay (tpLH/tpHL) — this is the channel's throughput ceiling. For a 100Mbps SPI clock, the 13ns delay adds less than one clock period of skew across the isolation barrier; the 4.5ns pulse-width distortion means the duty cycle holds within 5% at 100Mbps, so downstream logic sees a clean clock edge. 35kV/µs common-mode transient immunity (CMTI) — this is the key spec for motor-drive or inverter applications where the ground plane jumps during PWM switching. A 600V IGBT bridge switching at 10kHz generates dV/dt in the 10-20kV/µs range; the SI8641BA-B-IU's 35kV/µs rating gives 2x margin against false toggling on the output. The 3/1 channel split (three inputs on side 1, one on side 2) is unidirectional — data flows one way per channel. This suits a three-channel SPI bus (SCLK, MOSI, CS) with a single return path (MISO) across the barrier, or three digital sensor inputs with one status feedback line. ## Package and supply — board-fit checklist The difference is within PCB layout tolerance for most designs; verify the land pattern against the Skyworks package drawing before committing a board spin. Supply range 2.5V to 5.5V on both sides — no separate VDDIO rail needed. The same 3.3V or 5V rail can power both the input and output stages, simplifying the power tree. No isolated power converter required (the part does not include an integrated DC-DC). The 2.5ns rise/fall time (typical) means the output slew rate is fast enough to drive a 15pF load at 150Mbps without excessive ringing, but the fast edge also couples more switching noise back to the supply — a 0.1µF bypass cap within 2mm of each supply pin is the standard mitigation.","metaTitle":"Skyworks SI8641BA-B-IU Digital Isolator, 150Mbps, 4Ch","metaDescription":"Skyworks SI8641BA-B-IU general-purpose digital isolator, 150Mbps, 4 channels, 1000Vrms isolation, -40°C to 125°C, 16-QSOP. Active, RoHS3 compliant.","metaKeywords":null},"attributes":{"series":"Si864x","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Digital Isolators"],"specifications":{"Type":"General Purpose","Series":"Si864x","Package":"Tube","Data Rate":"150Mbps","Technology":"Capacitive Coupling","Channel Type":"Unidirectional","Mounting Type":"Surface Mount","Isolated Power":"No","Package / Case":"16-SSOP (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.5V ~ 5.5V","Number of Channels":"4","Voltage - Isolation":"1000Vrms","Operating Temperature":"-40°C ~ 125°C","Inputs - Side 1/Side 2":"3/1","Rise / Fall Time (Typ)":"2.5ns, 2.5ns","Supplier Device Package":"16-QSOP","Pulse Width Distortion (Max)":"4.5ns","Propagation Delay tpLH / tpHL (Max)":"13ns, 13ns","Common Mode Transient Immunity (Min)":"35kV/µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.59","stockQuantity":27,"priceTiers":[{"qty":1,"price":"$3.59000","currency":"USD"},{"qty":10,"price":"$3.22100","currency":"USD"},{"qty":25,"price":"$3.04520","currency":"USD"},{"qty":100,"price":"$2.63910","currency":"USD"},{"qty":250,"price":"$2.50380","currency":"USD"},{"qty":500,"price":"$2.24664","currency":"USD"},{"qty":1000,"price":"$1.89476","currency":"USD"},{"qty":2500,"price":"$1.80002","currency":"USD"},{"qty":5000,"price":"$1.73235","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/be2be0cd247effc5bbc93f4ca5c7a629.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SI8641BA-B-IU pin-compatible with SI8641BA-C-IU for a drop-in replacement?","answer":"Yes — the SI8641BA-C-IU shares the same 16-QSOP footprint, 150Mbps data rate, 3/1 channel configuration, and 2.5V-5.5V supply range. The only difference is the isolation voltage rating: the -B variant is 1000Vrms, while the -C variant is not explicitly rated at a higher voltage in the peer record. If your design was validated around the -C variant at 1000Vrms or lower, the SI8641BA-B-IU drops in without rewiring or layout changes."},{"question":"What compliance documentation does Skyworks provide for SI8641BA-B-IU?","answer":"The part carries no UL or IEC certification listed in the spec table; verify with Skyworks directly if agency marking is required for your end-equipment certification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/skyworks/SI8641BA-B-IU","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/skyworks/SI8641BA-B-IU 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}}