{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SI8661EC-B-IS1R","brand":"Skyworks Solutions","brandSlug":"skyworks","productSlug":"SI8661EC-B-IS1R","canonicalUrl":"https://icboms.com/skyworks/SI8661EC-B-IS1R","factsUrl":"https://icboms.com/api/mcp/products/SI8661EC-B-IS1R","rawCanonicalId":null},"summary":{"shortDescription":"Skyworks Solutions SI8661EC-B-IS1R, General Purpose Digital Isolator, 6-channel, 150Mbps, 3750Vrms, Capacitive Coupling, Unidirectional, 16-SOIC, Tape & Reel.","salesMarkdown":"## 150Mbps isolation channel with 3750Vrms reinforced rating The Skyworks SI8661EC-B-IS1R is a 6-channel digital isolator built on capacitive coupling technology, delivering 150Mbps per channel across a reinforced 3750Vrms isolation barrier. That data rate handles full-speed SPI, UART, and parallel GPIO isolation without bottlenecking the bus — the 13ns typical propagation delay and 2.5ns rise/fall times keep the signal edges clean for the downstream logic. The 5/1 channel configuration (five forward, one reverse) suits mixed-direction isolation needs — for example, isolating an SPI bus (SCLK, MOSI, MISO, CS, plus a status line) while keeping one channel for interrupt or fault feedback from the isolated side. ## CMTI and propagation — what they mean for motor-drive and industrial isolation Common-mode transient immunity of 35kV/µs (minimum) is the spec that matters when this isolator sits between a 3-phase inverter's gate-driver outputs and the controller. Fast voltage slewing on the motor phases couples common-mode current across the isolation barrier; if the CMTI is too low, the receiver side sees false edges. At 35kV/µs, the SI8661EC-B-IS1R handles the worst-case switching edges from SiC and GaN half-bridges without bit errors. Pulse-width distortion is capped at 4.5ns maximum — important when the isolator passes PWM signals for motor speed control or heater duty cycles. A 100kHz PWM with 50% duty has a 5µs on-time; 4.5ns of distortion shifts the duty cycle by less than 0.1%, so the load sees the commanded average voltage within the control loop's margin. The unidirectional channel architecture means the direction is fixed at design time — not configurable like an isolator with directional control pins.","metaTitle":"SI8661EC-B-IS1R Skyworks Digital Isolator, 150Mbps, 3750Vrms","metaDescription":"Skyworks SI8661EC-B-IS1R 6-channel digital isolator, 150Mbps data rate, 3750Vrms isolation, 35kV/µs CMTI, 16-SOIC. Active production, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Digital Isolators"],"specifications":{"Type":"General Purpose","Package":"Tape & Reel (TR); Cut Tape (CT)","Data Rate":"150Mbps","Technology":"Capacitive Coupling","Channel Type":"Unidirectional","Mounting Type":"Surface Mount","Isolated Power":"No","Package / Case":"16-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"2.5V ~ 5.5V","Number of Channels":"6","Voltage - Isolation":"3750Vrms","Operating Temperature":"-40°C ~ 125°C","Inputs - Side 1/Side 2":"5/1","Rise / Fall Time (Typ)":"2.5ns, 2.5ns","Supplier Device Package":"16-SOIC","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":"$5.81","stockQuantity":30,"priceTiers":[{"qty":1,"price":"$5.81000","currency":"USD"},{"qty":10,"price":"$5.21600","currency":"USD"},{"qty":25,"price":"$4.93120","currency":"USD"},{"qty":100,"price":"$4.27380","currency":"USD"},{"qty":250,"price":"$4.05464","currency":"USD"},{"qty":500,"price":"$3.63822","currency":"USD"},{"qty":1000,"price":"$3.06838","currency":"USD"},{"qty":2500,"price":"$2.91496","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d0fd34ad18bd716c3bfaa7fe80e62960.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Will SI8661EC-B-IS1R drop into a board designed for SI8661BC-B-IS1R?","answer":"Yes — both are 6-channel, 150Mbps digital isolators in the 16-SOIC narrow-body package with the same 5/1 channel configuration and pinout. The difference is the isolation voltage: the 'EC' variant is rated 3750Vrms, while the 'BC' variant is 2500Vrms. The PCB footprint and supply voltage range (2.5V to 5.5V) are identical, so the EC part is a drop-in replacement that adds isolation margin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/skyworks/SI8661EC-B-IS1R","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/skyworks/SI8661EC-B-IS1R 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}}