{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SFH618A-2","brand":"Vishay","brandSlug":"vishay","productSlug":"SFH618A-2","canonicalUrl":"https://icboms.com/vishay/SFH618A-2","factsUrl":"https://icboms.com/api/mcp/products/SFH618A-2","rawCanonicalId":null},"summary":{"shortDescription":"Vishay SFH618A-2 optocoupler, 1-channel DC input, transistor output, 5300Vrms isolation, 4-DIP through-hole, 63-125% CTR at 1mA, -55°C to 100°C.","salesMarkdown":"## Optocoupler with 5.3 kV isolation — active and available The Vishay SFH618A-2 is a single-channel phototransistor optocoupler in a 4-DIP through-hole package, rated for 5300Vrms isolation between input and output. It accepts a DC input on the LED side and switches a phototransistor on the output, with a current transfer ratio (CTR) binned between 63% and 125% at a forward current of 1 mA. This CTR range is the key parameter for the design: it defines how much collector current the output transistor can sink for a given LED drive, which sets the pull-up resistor value and noise margin in digital isolation or the feedback gain in a switched-mode power supply. The -2 CTR bin (63% minimum, 125% maximum at 1 mA) is a middle-grade selection — tighter than the broad -1 bin, but not as high as the -3 or -4 bins in the SFH618A family. A higher CTR lets you drive the LED with less current, reducing power draw on the primary side, but the trade-off is a wider spread that can complicate worst-case margin analysis. The 55 V output breakdown and 50 mA continuous output current give enough headroom for driving a logic gate input or a small-signal MOSFET gate through a resistor. ## Temperature range and isolation rating The 5300Vrms isolation voltage is a reinforced-grade rating, suitable for mains-isolated feedback in off-line power supplies and for safety-barrier applications that require a 5 kV minimum. The 4-DIP package with 7.62 mm pin spacing provides the creepage distance needed to maintain the isolation rating across the board.","metaTitle":"SFH618A-2 Optocoupler, 5300Vrms, 4-DIP Through Hole","metaDescription":"SFH618A-2 optocoupler with 5300Vrms isolation, transistor output, 63-125% CTR at 1mA, 4-DIP through-hole package.","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":"Through Hole","Package / Case":"4-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"5300Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-55°C ~ 100°C","Rise / Fall Time (Typ)":"3.5µs, 5µs","Voltage - Output (Max)":"55V","Supplier Device Package":"4-DIP","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"125% @ 1mA","Current Transfer Ratio (Min)":"63% @ 1mA","Voltage - Forward (Vf) (Typ)":"1.1V","Turn On / Turn Off Time (Typ)":"6µs, 5.5µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.10000","currency":"USD"},{"qty":10,"price":"$0.71800","currency":"USD"},{"qty":100,"price":"$0.47020","currency":"USD"},{"qty":1000,"price":"$0.37118","currency":"USD"},{"qty":2000,"price":"$0.34643","currency":"USD"},{"qty":5000,"price":"$0.33406","currency":"USD"},{"qty":10000,"price":"$0.32911","currency":"USD"},{"qty":25000,"price":"$0.32168","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4bb15ce016d1cbb8f2e268ef9c695016.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current transfer ratio of SFH618A-2?","answer":"The CTR is specified between 63% (minimum) and 125% (maximum) at a forward current of 1 mA. This bin (-2) is a mid-range selection; the actual CTR for any given unit falls within that window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/SFH618A-2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/SFH618A-2 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}}