{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SI8641BB-B-IU","brand":"Skyworks Solutions","brandSlug":"skyworks","productSlug":"SI8641BB-B-IU","canonicalUrl":"https://icboms.com/skyworks/SI8641BB-B-IU","factsUrl":"https://icboms.com/api/mcp/products/SI8641BB-B-IU","rawCanonicalId":null},"summary":{"shortDescription":"Skyworks Solutions Si864x series digital isolator, SI8641BB-B-IU, 4-channel unidirectional, 150Mbps data rate, 2500Vrms isolation, capacitive coupling, 16-SSOP package, -40°C to 125°C.","salesMarkdown":"## Isolation for a noisy backplane The SI8641BB-B-IU is a 4-channel general-purpose digital isolator from Skyworks' Si864x family, built around capacitive coupling technology. It delivers 2500Vrms of galvanic isolation, which is the standard barrier for breaking ground loops between a 24V fieldbus interface and a 3.3V controller core in an industrial PLC or motor-drive control board. The 35kV/µs common-mode transient immunity (CMTI) means this part can sit on a gate-driver side of a motor-drive inverter without the isolation barrier latching up or dropping bits during a fast-switching event. For a 600V IGBT bridge switching at 10-20 kHz, the common-mode slew rate across the barrier can exceed 10 kV/µs; the 35 kV/µs rating gives a solid 3x margin. ## Data rate and timing for the signal chain Rated for 150 Mbps, the isolator handles high-speed SPI buses (up to 50 MHz quad-SPI) and parallel data links without adding a clock-cycle penalty. The 13 ns max propagation delay (tpLH / tpHL) is symmetric, so the pulse-width distortion stays under 4.5 ns — critical for maintaining duty cycle on a PWM signal or a Manchester-encoded fieldbus like RS-485. The 2.5 ns typical rise/fall time means the output edges are fast enough for 150 Mbps but not so aggressive that they cause crosstalk on a tightly packed 16-pin SSOP layout. ## Channel assignment and supply flexibility Four unidirectional channels, configured as three on side 1 and one on side 2. This 3/1 split is typical for isolating a 3-wire SPI bus (SCLK, MOSI, CS) from the controller to the peripheral, with the MISO return channel on the isolated side. The unidirectional architecture means no bidirectional data lines — plan for a separate isolator or a discrete buffer if the bus needs bidirectional signalling. No external level shifter needed between the two domains — the isolator handles the translation internally. ## Temperature grade and field servicing It survives the inside of a motor junction box in summer and a cold-start PLC cabinet in a Canadian winter. Surface-mount 16-SSOP with 0.154-inch (3.90 mm) body width — a standard fine-pitch SOIC footprint. No exposed pad, so solder paste volume is less critical than on a QFN.","metaTitle":"Skyworks SI8641BB-B-IU Digital Isolator, 150Mbps, 2.5kVrms","metaDescription":"Skyworks SI8641BB-B-IU digital isolator: 4-channel, 150Mbps, 2.5kVrms isolation, 35kV/µs CMTI, -40°C to 125°C. Active production, 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":"2500Vrms","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":"$3.88","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.88000","currency":"USD"},{"qty":10,"price":"$3.48600","currency":"USD"},{"qty":25,"price":"$3.29520","currency":"USD"},{"qty":100,"price":"$2.85580","currency":"USD"},{"qty":250,"price":"$2.70932","currency":"USD"},{"qty":500,"price":"$2.43108","currency":"USD"},{"qty":1000,"price":"$2.05030","currency":"USD"},{"qty":2500,"price":"$1.94778","currency":"USD"},{"qty":5000,"price":"$1.87456","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/be2be0cd247effc5bbc93f4ca5c7a629.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between SI8641BB-B-IU and SI8641BD-B-IS?","answer":"The SI8641BD-B-IS offers 5000Vrms isolation versus the 2500Vrms of the SI8641BB-B-IU. Both are 4-channel, 150Mbps parts in the Si864x family. The BD variant is pin-compatible but in a wider-body SOIC-16 package to accommodate the higher isolation spacing. If your design already has clearance for the larger package, the BD part is a drop-in upgrade for higher isolation margin."},{"question":"Will SI8641BB-B-IU drop into a board designed for SI8641BB-B-IS1R?","answer":"Yes, the SI8641BB-B-IU and SI8641BB-B-IS1R share the same die, the same 16-SSOP package, and the same pinout. The only difference is the packaging format: the IU suffix is tube, the IS1R suffix is tape and reel. Electrically and mechanically identical — no board spin required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/skyworks/SI8641BB-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/SI8641BB-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}}