{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TLP388(TPR,E","brand":"Toshiba Semiconductor","brandSlug":"toshiba","productSlug":"TLP388TPRE","canonicalUrl":"https://icboms.com/toshiba/TLP388TPRE","factsUrl":"https://icboms.com/api/mcp/products/TLP388(TPR%2CE","rawCanonicalId":null},"summary":{"shortDescription":"Toshiba TLP388(TPR,E transistor output optocoupler, 1-channel, DC input, 5000Vrms isolation, 350V VCEO, 50-600% CTR at 5mA, 6-SOIC-4 lead, surface mount, -55 to 125°C.","salesMarkdown":"## High-voltage transistor output optocoupler for industrial isolation The Toshiba TLP388(TPR,E is a single-channel transistor output optocoupler designed for applications requiring reinforced isolation and a high collector-emitter voltage rating. The current transfer ratio spans 50% to 600% at 5mA forward current, giving you a wide operating margin over temperature and device lifetime. The 400mV Vce(sat) maximum keeps the output drop low enough to drive logic inputs or a downstream transistor directly. The 5000Vrms isolation rating is the reinforced-level barrier you need for safety-isolated power-supply feedback loops, motor-drive gate-drive interfaces, and medical equipment where the clearance and creepage path must pass IEC 60950 or 60601. In a 6-SOIC-4 package with only 4 leads, the physical spacing is tight — the 5000Vrms figure tells you the internal opto stack and mould compound are built for it, but you still need to verify PCB creepage distance for your working voltage. ## 350V VCEO — not your 30V optocoupler The 350V maximum collector-emitter voltage is the distinguishing spec. This is not a generic 30V or 80V transistor output — it is designed for circuits that switch or sense on a high-voltage DC bus, such as 250V or 300V rail monitoring in PFC stages, offline flyback feedback, or 277VAC industrial control inputs. ## Switching speed and drive considerations Rise and fall times are 2µs and 3µs typical, with turn-on and turn-off both at 3µs typical. That puts the useful switching frequency around 50-100 kHz for digital signals — fine for isolated PWM feedback at moderate frequency, but not for high-speed data or gate-drive at hundreds of kHz. The 1.25V typical forward voltage and 50mA max forward current are standard for an LED-driven input; the 50% minimum CTR at 5mA ensures the output can saturate even with a weak drive from a 3.3V or 5V logic pin through a current-limiting resistor. ## Package and mounting Supplied in a 6-SOIC package with 4 leads (the two centre pins are omitted for creepage), surface-mount only. The 4-lead SOIC footprint is compact — verify the pad layout against your assembly house's stencil design to avoid solder bridging on the narrow body.","metaTitle":"TLP388(TPR,E Transistor Output Optocoupler, 5000Vrms","metaDescription":"TLP388(TPR,E transistor output optocoupler in 6-SOIC-4. 5000Vrms isolation, 350V VCEO, 50-600% CTR at 5mA. -55 to 125°C. 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":"6-SOIC (0.173\\\", 4.40mm Width), 4 Leads","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"5000Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-55°C ~ 125°C","Rise / Fall Time (Typ)":"2µs, 3µs","Voltage - Output (Max)":"350V","Supplier Device Package":"6-SO, 4 Lead","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":"$0.78","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.78000","currency":"USD"},{"qty":10,"price":"$0.50700","currency":"USD"},{"qty":100,"price":"$0.33200","currency":"USD"},{"qty":1000,"price":"$0.26210","currency":"USD"},{"qty":3000,"price":"$0.24462","currency":"USD"},{"qty":6000,"price":"$0.23589","currency":"USD"},{"qty":15000,"price":"$0.23239","currency":"USD"},{"qty":30000,"price":"$0.22715","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/312d4169544f072d9d6f6356098f22f3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current transfer ratio (CTR) range for TLP388(TPR,E?","answer":"The CTR range is 50% minimum to 600% maximum, both specified at 5mA forward current. The wide bin gives you margin for temperature and aging, but design the input drive for the 50% minimum to guarantee saturation at end of life."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/toshiba/TLP388TPRE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/toshiba/TLP388TPRE 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}}