{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TLP291(BL-TP,SE","brand":"Toshiba Semiconductor","brandSlug":"toshiba","productSlug":"TLP291BL-TPSE","canonicalUrl":"https://icboms.com/toshiba/TLP291BL-TPSE","factsUrl":"https://icboms.com/api/mcp/products/TLP291(BL-TP%2CSE","rawCanonicalId":null},"summary":{"shortDescription":"Toshiba TLP291(BL-TP,SE single-channel transistor-output optocoupler, 3750Vrms isolation, 200% to 600% CTR at 5mA, 80V output, 50mA output current, 4-SOIC surface-mount package, -55°C to 110°C operating range.","salesMarkdown":"## 3750Vrms isolation in a 4-SOIC — what it buys the BOM The Toshiba TLP291(BL-TP,SE is a single-channel DC-input, transistor-output optocoupler rated for 3750Vrms galvanic isolation. It comes in a 4-SOIC surface-mount package (4.55 mm width) and is specified over the full -55°C to 110°C operating range. The BL suffix denotes a current transfer ratio (CTR) bin of 200% to 600% at a forward current of 5 mA, which gives the designer a predictable gain window for driving logic inputs or low-current loads up to 50 mA per channel. The output transistor can block up to 80 V, making it suitable for 24 V or 48 V industrial bus interfaces. ## CTR bin and switching speed — sizing the drive margin The BL CTR bin (200% to 600% at 5 mA) sits between the lower GR rank and the higher GB rank in the TLP291 family. At 5 mA forward current, the minimum CTR of 200% guarantees the output transistor can saturate with a collector current of at least 10 mA, which is adequate for most TTL/CMOS logic inputs or relay-driver stages. Typical rise and fall times are 2 µs and 3 µs respectively, with turn-on and turn-off times both at 3 µs typical — fast enough for 100 kHz switching applications but not for high-speed data isolation. The 300 mV maximum Vce saturation at the rated output current keeps power dissipation low in the output stage.","metaTitle":"TLP291(BL-TP,SE Optocoupler, 3750Vrms, 4-SOIC, Active","metaDescription":"Toshiba TLP291(BL-TP,SE single-channel transistor-output optocoupler, 3750Vrms isolation, 200-600% CTR at 5mA, -55 to 110°C, 4-SOIC. Active, ROHS3.","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)":"200% @ 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 (CTR) of TLP291?","answer":"For the BL rank, the CTR is specified as 200% minimum and 600% maximum at a forward current of 5 mA. This bin provides a predictable gain window for driving loads up to 50 mA."},{"question":"Does TLP291(BL-TP,SE have an equivalent or cross-reference?","answer":"The TLP291(TP,SE and TLP291(GRL-TP,SE are same-function siblings within the TLP291 family, differing only in CTR bin. All share the same 4-SOIC footprint and 3750Vrms isolation rating."},{"question":"Is TLP291(BL-TP,SE RoHS compliant?","answer":"Yes, the TLP291(BL-TP,SE is listed as ROHS3 compliant, covering the current EU RoHS exemption categories."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/toshiba/TLP291BL-TPSE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/toshiba/TLP291BL-TPSE 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}}