{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ILQ74-X009T","brand":"Vishay","brandSlug":"vishay","productSlug":"ILQ74-X009T","canonicalUrl":"https://icboms.com/vishay/ILQ74-X009T","factsUrl":"https://icboms.com/api/mcp/products/ILQ74-X009T","rawCanonicalId":null},"summary":{"shortDescription":"Vishay ILQ74-X009T quad-channel optocoupler, 5300 Vrms isolation, transistor output, 3 µs typ switching, 16-SMD gull-wing package, -55°C to 100°C, active lifecycle.","salesMarkdown":"## 5300 Vrms isolation — the barrier spec that decides fit The ILQ74-X009T is a Vishay quad-channel phototransistor optocoupler in a 16-SMD gull-wing package. Its headline rating is 5300 Vrms isolation between input and output — a figure that qualifies it for reinforced insulation in industrial motor drives, medical patient-contact interfaces, and power-supply feedback loops where a single fault must not create a shock hazard. The four independent channels share a common LED-side and detector-side, so one package replaces four single-channel isolators, saving board area and placement cost. ## 3 µs switching — slow but deliberate Typical turn-on and turn-off times are both 3 µs. That puts this part squarely in the low-frequency isolation space — think DC signal detection, 50/60 Hz line monitoring, relay replacement, or slow digital I/O. It will not handle high-speed comms (CAN, SPI, Ethernet) or gate-drive waveforms; for those you need a digital isolator or a faster optocoupler family. The 3 µs symmetry is useful: the output waveform stays roughly square, so timing margins in a slow loop are predictable. ## 12.5% minimum CTR — plan the LED drive The minimum current transfer ratio is 12.5% at 16 mA forward current. That means with 16 mA through the LED, the output transistor can sink at least 2 mA (12.5% of 16 mA). In practice, CTR degrades with temperature and over the life of the part — the typical CTR is higher, but the minimum is what you design to for guaranteed saturation across the -55°C to 100°C range. The forward voltage is 1.3 V typical, and the absolute maximum forward current is 60 mA, so there is headroom to overdrive the LED if the application demands higher output current at the cost of LED lifetime.","metaTitle":"ILQ74-X009T Vishay Optocoupler","metaDescription":"ILQ74-X009T Vishay quad-channel optocoupler, 5300 Vrms isolation, transistor output, 3 µs switching, -55°C to 100°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"16-SMD, Gull Wing","lifecycle_stage":"eol_hot","Number of Channels":"4","Voltage - Isolation":"5300Vrms","Vce Saturation (Max)":"500mV","Operating Temperature":"-55°C ~ 100°C","Voltage - Output (Max)":"20V","Supplier Device Package":"16-SMD","Current Transfer Ratio (Min)":"12.5% @ 16mA","Voltage - Forward (Vf) (Typ)":"1.3V","Turn On / Turn Off Time (Typ)":"3µs, 3µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.95","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.95000","currency":"USD"},{"qty":10,"price":"$2.79300","currency":"USD"},{"qty":100,"price":"$2.28790","currency":"USD"},{"qty":750,"price":"$1.86224","currency":"USD"},{"qty":1500,"price":"$1.76913","currency":"USD"},{"qty":2250,"price":"$1.69597","currency":"USD"},{"qty":5250,"price":"$1.66271","currency":"USD"}]},"links":{"datasheetUrl":"https://www.vishay.com/docs/83640/ild74.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the maximum forward current of ILQ74-X009T?","answer":"The absolute maximum DC forward current is 60 mA. For reliable long-term operation, stay within the recommended operating range and derate for ambient temperature above 25°C per the LED derating curve."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/ILQ74-X009T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/ILQ74-X009T 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}}