{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD0721","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD0721","canonicalUrl":"https://icboms.com/onsemi/FOD0721","factsUrl":"https://icboms.com/api/mcp/products/FOD0721","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD0721 optoisolator, 25Mbps, 3750Vrms isolation, push-pull/totem-pole output, 8-SOIC surface-mount, tube packaging.","salesMarkdown":"## What 25Mbps and 20kV/µs CMTI mean on the bench The FOD0721: The 20kV/µs common-mode transient immunity means the output does not glitch when a motor drive or inverter switches — the isolation barrier rejects the fast voltage step that would otherwise couple through a slower opto. This is the spec that matters in a VFD or servo drive application. Propagation delay is 40ns max both ways — the part can handle a 12.5MHz clock without timing violations, but the 40ns adds to the loop latency in a closed-loop control path. For a 100kHz PWM cycle, 40ns is negligible; for a 1MHz switching regulator feedback, it starts to matter. ## Package and field-swap reality 8-SOIC with 1.27mm pitch — hand-solderable with a fine-tip iron and some flux. No hot-air station required unless you are removing it from a board with a solid ground plane. The pin 1 mark is a dot on the package top; orientation is obvious once you see it. Industrial temperature range -40°C to 100°C covers most enclosures — the part will run in an unheated cabinet or a hot panel near a drive heatsink. ## Lifecycle and compliance The output is push-pull / totem-pole, so it drives a CMOS or TTL input directly without a pull-up resistor — one less component on the BOM. The 10mA per-channel output current is enough for a standard logic gate input, not for driving a relay coil or LED directly.","metaTitle":"onsemi FOD0721 Optoisolator, 25Mbps, 3750Vrms, 8-SOIC","metaDescription":"onsemi FOD0721 optoisolator — 25Mbps data rate, 3750Vrms isolation, 20kV/µs CMTI, push-pull output, 8-SOIC. Active production, ROHS3 compliant. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","Data Rate":"25Mbps","Input Type":"Logic","Output Type":"Push-Pull, Totem Pole","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"4.5V ~ 5.5V","Number of Channels":"1","Voltage - Isolation":"3750Vrms","Operating Temperature":"-40°C ~ 100°C","Inputs - Side 1/Side 2":"1/0","Rise / Fall Time (Typ)":"5ns, 4.5ns","Supplier Device Package":"8-SOIC","Current - Output / Channel":"10 mA","Propagation Delay tpLH / tpHL (Max)":"40ns, 40ns","Common Mode Transient Immunity (Min)":"20kV/µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.59","stockQuantity":24,"priceTiers":[{"qty":1,"price":"$4.59000","currency":"USD"},{"qty":10,"price":"$3.24400","currency":"USD"},{"qty":100,"price":"$2.65720","currency":"USD"},{"qty":500,"price":"$2.24010","currency":"USD"},{"qty":1000,"price":"$2.05471","currency":"USD"},{"qty":2000,"price":"$1.96974","currency":"USD"},{"qty":5000,"price":"$1.93112","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b35decdd0d1ff29aa2f6c53e0f9d6944.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the FOD0721's data rate and why does it matter?","answer":"The FOD0721 is rated for 25Mbps. That is fast enough for isolated SPI, CAN, RS-485, and most industrial fieldbuses, but not for gigabit Ethernet or video links. The 40ns propagation delay sets the timing budget for closed-loop control loops."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD0721","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD0721 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}}