{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TCMT1109","brand":"Vishay","brandSlug":"vishay","productSlug":"TCMT1109","canonicalUrl":"https://icboms.com/vishay/TCMT1109","factsUrl":"https://icboms.com/api/mcp/products/TCMT1109","rawCanonicalId":null},"summary":{"shortDescription":"Vishay TCMT1109 optocoupler, 1-channel DC-input transistor output, 3750Vrms isolation, 200-400% CTR at 5mA, 4-SOIC surface-mount, -40°C to 100°C.","salesMarkdown":"## Galvanic isolation in a compact 4-SOIC The Vishay TCMT1109 is a single-channel optocoupler with a DC-input phototransistor output, rated for 3750Vrms isolation voltage. It comes in a 4-SOIC surface-mount package, 4.40mm wide, suited for industrial and consumer applications where galvanic isolation is needed between low-voltage control logic and higher-voltage loads. The current transfer ratio (CTR) is specified at 200% minimum and 400% maximum when the LED forward current is 5mA, giving a well-defined window for logic-level interface design. ## CTR range and switching timing With a CTR spanning 200% to 400% at 5mA forward current, the TCMT1109 provides consistent gain for driving digital inputs or low-current loads. The output transistor can handle up to 50mA per channel and a maximum collector-emitter voltage of 70V. Typical turn-on time is 9.5µs and turn-off is 8.5µs, with rise and fall times of 5.5µs and 7µs respectively — fast enough for 100 kHz-ish switching or isolated serial data at moderate baud rates. The 300mV Vce saturation at max rated current keeps power dissipation low in the output stage. ## Temperature range and rework considerations The 4-SOIC package is straightforward to rework with hot air — low thermal mass, no exposed pad, and the 0.173\" body width means it lifts cleanly without cooking adjacent parts. For a production BOM, this part presents no near-term obsolescence risk.","metaTitle":"TCMT1109 Optoisolator, 3750Vrms, 4-SOIC, Active","metaDescription":"TCMT1109 optocoupler with 3750Vrms isolation, 200-400% CTR at 5mA, transistor output, surface-mount 4-SOIC. Active lifecycle, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Signal Isolation"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"4-SOIC (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"3750Vrms","Vce Saturation (Max)":"300mV","Operating Temperature":"-40°C ~ 100°C","Rise / Fall Time (Typ)":"5.5µs, 7µs","Voltage - Output (Max)":"70V","Supplier Device Package":"4-SOP","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"400% @ 5mA","Current Transfer Ratio (Min)":"200% @ 5mA","Voltage - Forward (Vf) (Typ)":"1.35V","Turn On / Turn Off Time (Typ)":"9.5µs, 8.5µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.62","priceTiers":[{"qty":1,"price":"$0.62000","currency":"USD"},{"qty":10,"price":"$0.40800","currency":"USD"},{"qty":100,"price":"$0.27020","currency":"USD"},{"qty":1000,"price":"$0.20860","currency":"USD"},{"qty":3000,"price":"$0.18849","currency":"USD"},{"qty":6000,"price":"$0.17592","currency":"USD"},{"qty":15000,"price":"$0.16964","currency":"USD"},{"qty":30000,"price":"$0.16713","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/af0b0e26700205d711eb6f1255713a19.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TCMT1109/alternatives.json"},"ai":{"faq":[{"question":"What is the CTR of TCMT1109?","answer":"The current transfer ratio is 200% minimum and 400% maximum, measured at 5mA forward current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/TCMT1109","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/TCMT1109 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}