{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TLP291(TP,SE","brand":"Toshiba Semiconductor","brandSlug":"toshiba","productSlug":"TLP291TPSE","canonicalUrl":"https://icboms.com/toshiba/TLP291TPSE","factsUrl":"https://icboms.com/api/mcp/products/TLP291(TP%2CSE","rawCanonicalId":null},"summary":{"shortDescription":"Toshiba TLP291(TP,SE single-channel transistor-output optocoupler, 3750Vrms isolation, 50-600% CTR at 5mA, 80V output max, 4-SOIC package, -55 to 110°C operating range.","salesMarkdown":"The Toshiba TLP291(TP,SE is a single-channel transistor-output optocoupler in a 4-SOIC surface-mount package. It provides 3750Vrms of galvanic isolation between a DC input LED and a phototransistor output, making it a straightforward choice for breaking ground loops in industrial control, PLC I/O modules, and isolated sensor interfaces. The 4-SOIC footprint is a standard, widely used outline — you can swap it in the field with basic tweezers and a soldering iron, no hot-air station needed. ## CTR range — the number that decides fit The current transfer ratio spans 50% minimum to 600% maximum, both specified at a 5mA LED forward current. That wide spread means you need to design the load resistor and input drive for the worst-case minimum CTR, not the typical. At 50% CTR, 5mA in gives you 2.5mA of collector current — enough to drive a logic gate input or a small relay coil if the pull-up is sized right. The 600% ceiling tells you the part can saturate hard at higher LED currents, which matters for switching speed consistency. ## Speed and drive — rise/fall and saturation Typical rise and fall times are 2µs and 3µs respectively, with turn-on and turn-off both at 3µs. That puts this part in the general-purpose opto class — fine for 10kHz-ish switching or DC level shifting, but not for high-speed serial isolation. The Vce saturation maxes at 300mV, so the transistor pulls close to ground when fully on, which keeps the logic-low threshold clean for 3.3V and 5V CMOS inputs. Output can handle up to 80V and 50mA per channel, enough for driving a small solenoid or a solid-state relay input directly. ## Temperature range and environment Rated for -55°C to 110°C operating, this opto covers the full industrial temperature band and even some automotive under-hood zones where the ECU sees ambient heat soak. The 110°C ceiling is a practical limit — if your enclosure runs hotter than that, you need a higher-temperature-rated isolator. Storage temperature exceeds the operating range, so the part survives shipping and handling extremes without damage.","metaTitle":"Toshiba TLP291(TP,SE Optoisolator, 3750Vrms, 4-SOIC","metaDescription":"Toshiba TLP291(TP,SE single-channel transistor output optocoupler. 3750Vrms isolation, 50-600% CTR at 5mA, -55 to 110°C. Active, ROHS3 compliant.","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":"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":2500,"price":"$0.14998","currency":"USD"},{"qty":5000,"price":"$0.13635","currency":"USD"},{"qty":12500,"price":"$0.12726","currency":"USD"},{"qty":25000,"price":"$0.12272","currency":"USD"},{"qty":62500,"price":"$0.11817","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/a8ee6f0a66b20e745d1c9a7a3ea4ce22.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current transfer ratio of TLP291?","answer":"The CTR is specified at 50% minimum and 600% maximum, both measured at a 5mA LED forward current. Design for the minimum to guarantee the output drives your load."},{"question":"Is the TLP291 RoHS compliant?","answer":"Yes, the TLP291(TP,SE is ROHS3 compliant, meeting the latest EU directive on hazardous substance restrictions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/toshiba/TLP291TPSE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/toshiba/TLP291TPSE 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}}