{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ISO7521CDWR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ISO7521CDWR","canonicalUrl":"https://icboms.com/texas-instruments/ISO7521CDWR","factsUrl":"https://icboms.com/api/mcp/products/ISO7521CDWR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ISO7521CDWR, General Purpose digital isolator, Capacitive Coupling, 2 Channel, 1/1 Inputs, 4243Vrms isolation, 1Mbps data rate, 14ns propagation delay, 25kV/µs CMTI, -40°C to 105°C, 16-SOIC package.","salesMarkdown":"## 4243Vrms isolation — where it fits in the system The Texas Instruments ISO7521CDWR is a two-channel, unidirectional digital isolator using capacitive coupling technology. Its headline rating is 4243Vrms of isolation voltage, which puts it in the reinforced-isolation class for industrial power supplies, motor drives, and PLC I/O modules where you need a clean barrier between the high-voltage side and the control logic. The 1 Mbps data rate is adequate for GPIO isolation, slow SPI (up to a few MHz), or UART handshake lines, but it will bottleneck a full-speed CAN or Ethernet interface — keep that in mind when reading the BOM. ## Propagation delay and CMTI — the real-world margins Propagation delay is 14 ns max in both directions, with a pulse-width distortion of 3.7 ns max. That is tight enough for most control-loop isolation where timing skew between channels matters. The common-mode transient immunity of 25 kV/µs is a strong number — it means the output won't glitch when a nearby relay or IGBT switches, which is the failure mode that kills a fieldbus link in a noisy cabinet. Rise and fall times are 1 ns typical, so the signal edges are clean but the layout needs care to avoid ringing on long traces. ## Supply rails and temperature range That means it can translate between a 3.3 V MCU domain and a 5 V sensor or actuator interface without an extra level shifter. ## Package and handling Housed in a 16-pin SOIC with 7.50 mm body width (the wide-body variant), surface-mount only. The wide pitch helps with creepage distance on the PCB — important when you are trying to meet 4243Vrms isolation without routing slots under the part. ## Lifecycle and sourcing posture ROHS3 compliant. For dual-sourcing resilience, the closest functional peer is the ISO7221CDR (same 2-channel unidirectional topology, 25 Mbps data rate, 2500Vrms isolation), but the ISO7221CDR has a lower isolation rating and a narrower supply range — verify the isolation requirement before swapping.","metaTitle":"ISO7521CDWR Digital Isolator, 4243Vrms, 1 Mbps, 16-SOIC","metaDescription":"Texas Instruments ISO7521CDWR general-purpose digital isolator. 4243Vrms isolation, 1 Mbps, 2 unidirectional channels, -40°C to 105°C. Active lifecycle.","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":"1Mbps","Technology":"Capacitive Coupling","Channel Type":"Unidirectional","Mounting Type":"Surface Mount","Isolated Power":"No","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3.15V ~ 3.45V, 4.75V ~ 5.25V","Number of Channels":"2","Voltage - Isolation":"4243Vrms","Operating Temperature":"-40°C ~ 105°C","Inputs - Side 1/Side 2":"1/1","Rise / Fall Time (Typ)":"1ns, 1ns","Supplier Device Package":"16-SOIC","Pulse Width Distortion (Max)":"3.7ns","Propagation Delay tpLH / tpHL (Max)":"14ns, 14ns","Common Mode Transient Immunity (Min)":"25kV/µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.88","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.88000","currency":"USD"},{"qty":10,"price":"$3.48700","currency":"USD"},{"qty":25,"price":"$3.29600","currency":"USD"},{"qty":100,"price":"$2.85660","currency":"USD"},{"qty":250,"price":"$2.71012","currency":"USD"},{"qty":500,"price":"$2.43176","currency":"USD"},{"qty":1000,"price":"$2.07300","currency":"USD"},{"qty":2000,"price":"$2.07300","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/c8b55de2da001048d1023470952c668a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does ISO7521CDWR support 5V signaling?","answer":"Yes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ISO7521CDWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ISO7521CDWR 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}}