{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TLP291(SE","brand":"Toshiba Semiconductor","brandSlug":"toshiba","productSlug":"TLP291SE","canonicalUrl":"https://icboms.com/toshiba/TLP291SE","factsUrl":"https://icboms.com/api/mcp/products/TLP291(SE","rawCanonicalId":null},"summary":{"shortDescription":"Toshiba TLP291(SE, single-channel DC-input transistor-output optocoupler, 3750Vrms isolation, 4-SOIC surface-mount package, tube packaging, active production.","salesMarkdown":"## 3750Vrms isolation in a 4-SOIC footprint The TLP291(SE is a single-channel optocoupler from Toshiba that provides 3750Vrms of galvanic isolation between a DC input LED and a phototransistor output. The 4-SOIC package (0.179\" width, 4.55 mm) saves board space compared to DIP-4 alternatives while still meeting basic isolation requirements for industrial interfaces. With a current transfer ratio ranging from 50% to 600% at 5 mA forward current, the design must accommodate the full CTR spread — the minimum 50% guarantees the output transistor can saturate with a 5 mA LED drive, while the 600% maximum means the output can sink up to 50 mA without exceeding the 300 mV Vce(sat) ceiling. ## Switching speed and temperature range Rise and fall times are 2 µs and 3 µs typical, with turn-on and turn-off times both 3 µs typical. This suits low-frequency signal isolation (below ~50 kHz) such as PLC digital inputs, relay drivers, and status feedback loops — not for high-speed comms like I²C or CAN. The 80 V maximum output voltage and 50 mA continuous output current are adequate for driving logic gates, small relays, or optocoupler-isolated transistor stages.","metaTitle":"TLP291(SE Optoisolator – 3750Vrms, DC Input","metaDescription":"Toshiba TLP291(SE single-channel optocoupler. 3750Vrms isolation, 50-600% CTR at 5mA, -55°C to 110°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"4-SOIC (0.179\\\", 4.55mm Width)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"3750Vrms","Vce Saturation (Max)":"300mV","Operating Temperature":"-55°C ~ 110°C","Rise / Fall Time (Typ)":"2µs, 3µs","Voltage - Output (Max)":"80V","Supplier Device Package":"4-SO","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"600% @ 5mA","Current Transfer Ratio (Min)":"50% @ 5mA","Voltage - Forward (Vf) (Typ)":"1.25V","Turn On / Turn Off Time (Typ)":"3µs, 3µs","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.59","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.59000","currency":"USD"},{"qty":10,"price":"$0.36400","currency":"USD"},{"qty":100,"price":"$0.20910","currency":"USD"},{"qty":1000,"price":"$0.16362","currency":"USD"},{"qty":2000,"price":"$0.14999","currency":"USD"},{"qty":5000,"price":"$0.13635","currency":"USD"},{"qty":10000,"price":"$0.12726","currency":"USD"},{"qty":25000,"price":"$0.12272","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a8ee6f0a66b20e745d1c9a7a3ea4ce22.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source to TLP291(SE?","answer":"Within the same TLP291 family, the TLP291(GRH,SE, TLP291(GR,SE, and TLP291(GB,SE share the same package, pinout, isolation voltage, and switching speeds. The difference is the CTR bin — the (SE) suffix denotes the widest CTR range (50% to 600%). If your design can tolerate a narrower CTR spread, one of the other suffixes may be a drop-in substitute. Confirm the CTR requirements against your application before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/toshiba/TLP291SE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/toshiba/TLP291SE 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}}