{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SFH636","brand":"Vishay","brandSlug":"vishay","productSlug":"SFH636","canonicalUrl":"https://icboms.com/vishay/SFH636","factsUrl":"https://icboms.com/api/mcp/products/SFH636","rawCanonicalId":null},"summary":{"shortDescription":"SFH636 optocoupler, Vishay, 1-channel transistor output, 4420Vrms isolation, 6-DIP through-hole, 300ns switching, 19% CTR min at 16mA, -55°C to 100°C.","salesMarkdown":"## 4420Vrms isolation in a 6-DIP through-hole optocoupler The SFH636 is a single-channel optocoupler from Vishay with a 4420Vrms isolation rating, a transistor output, and a DC input. It comes in a 6-DIP through-hole package (0.300\" lead spacing), making it a fit for legacy through-hole designs, prototyping, and high-reliability hand-assembly where SMT is not preferred. The 300ns typical turn-on and turn-off times suit moderate-speed digital isolation up to a few MHz, while the 19% minimum current transfer ratio at 16 mA forward current ensures reliable logic-level translation across the barrier. ## Switching speed and drive — what the 300 ns and 19% CTR mean The 300 ns turn-on and turn-off times are symmetrical, which simplifies timing budget in pulse-width or data-isolation applications — you don't need to compensate for a lopsided propagation delay. The 19% CTR at 16 mA forward current means the output transistor can sink about 3 mA with that drive; for higher load currents, increase the LED current up to the 25 mA absolute maximum. The 400 mV Vce saturation at that current keeps the logic-low voltage well within TTL and 5V CMOS thresholds, answering the compatibility question: yes, the SFH636 works cleanly with 5V logic on the output side. ## Temperature grade and environment Rated for -55°C to 100°C operating temperature, this optocoupler covers industrial and military-temperature-range environments — outdoor telecom, motor drives, downhole instrumentation, and avionics bay equipment. The 4420Vrms isolation is a test voltage; for reinforced isolation applications, check the working voltage and creepage against your safety standard (IEC 60950, UL 1577). The through-hole DIP package is MSL 1 typically, but confirm the bake requirement if the original packaging has been opened.","metaTitle":"SFH636 Optocoupler, 4420Vrms, Transistor Output, 6-DIP","metaDescription":"SFH636 optocoupler with 4420Vrms isolation, transistor output, 300ns switching, 19% CTR. Active lifecycle, ROHS3.","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":"6-DIP (0.300\\\", 7.62mm)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"4420Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-55°C ~ 100°C","Voltage - Output (Max)":"20V","Supplier Device Package":"6-DIP","Current - Output / Channel":"8mA","Current Transfer Ratio (Min)":"19% @ 16mA","Voltage - Forward (Vf) (Typ)":"1.5V","Turn On / Turn Off Time (Typ)":"300ns, 300ns","Current - DC Forward (If) (Max)":"25 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.02","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$3.08000","currency":"USD"},{"qty":10,"price":"$2.05600","currency":"USD"},{"qty":100,"price":"$1.58250","currency":"USD"},{"qty":500,"price":"$1.43046","currency":"USD"},{"qty":1000,"price":"$1.22930","currency":"USD"},{"qty":2000,"price":"$1.16225","currency":"USD"},{"qty":5000,"price":"$1.13543","currency":"USD"}]},"links":{"datasheetUrl":"https://www.vishay.com/docs/83681/sfh636.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SFH636 compatible with 5V logic?","answer":"Yes. With a 400mV Vce saturation maximum and 20V output breakdown, the output transistor can drive 5V CMOS or TTL logic inputs directly. The 19% minimum CTR at 16 mA forward current provides enough output current to pull a 5V logic input low."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/SFH636","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/SFH636 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}}