{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VOT8121AB-T1","brand":"Vishay","brandSlug":"vishay","productSlug":"VOT8121AB-T1","canonicalUrl":"https://icboms.com/vishay/VOT8121AB-T1","factsUrl":"https://icboms.com/api/mcp/products/VOT8121AB-T1","rawCanonicalId":null},"summary":{"shortDescription":"Vishay VOT8121AB-T1, a single-channel phototriac optoisolator in a 4-SMD Gull Wing package, rated for 800 V off-state voltage, 5300 Vrms isolation, and a minimum static dV/dt of 1 kV/µs.","salesMarkdown":"## What the 1 kV/µs dV/dt rating means for inductive loads The VOT8121AB-T1 guarantees a minimum static dV/dt of 1 kV/µs. For a triac output, this is the slew rate the device can withstand on the off-state voltage without commutating falsely — critical when driving an inductive load such as a contactor coil, solenoid valve, or small AC motor where the line voltage is chopped by a triac or relay elsewhere on the same phase. The 800 V off-state rating lets the part block the peak of a 277 VAC line (390 Vpk) with margin for transients. The 5300 Vrms isolation satisfies reinforced insulation requirements per UL/VDE for mains-referenced control circuits. ## No zero-crossing — random-phase switching flexibility This phototriac has no zero-crossing circuit, meaning the output turns on immediately when the LED current exceeds the 10 mA maximum Ift. That enables phase-angle dimming or soft-start for incandescent lamps, heaters, or universal motors, but generates higher inrush and EMI at the switch-on point compared to a zero-crossing part. ## Active production, tape-and-reel packaging Vishay supplies it in Tape & Reel (TR) or Cut Tape (CT) options for the 4-SMD Gull Wing package. ## Approvals and temperature range The device is approved by CQC, cUL, UL, and VDE — a standard safety-agency set for AC-mains isolation. Operating temperature spans -55°C to 110°C, covering industrial control cabinets and outdoor telecom enclosures. The typical forward voltage is 1.2 V with a maximum DC forward current of 50 mA.","metaTitle":"VOT8121AB-T1 Vishay Phototriac Optoisolator, 800V, 5300Vrms","metaDescription":"Vishay VOT8121AB-T1 phototriac optoisolator: 800V off-state, 5300Vrms isolation, 1kV/µs dV/dt, no zero-crossing. Active production, ROHS3, 4-SMD Gull Wing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Triac","Mounting Type":"Surface Mount","Package / Case":"4-SMD, Gull Wing","Approval Agency":"CQC, cUL, UL, VDE","lifecycle_stage":"eol_hot","Number of Channels":"1","Static dV/dt (Min)":"1kV/µs","Current - Hold (Ih)":"400µA (Typ)","Voltage - Isolation":"5300Vrms","Voltage - Off State":"800 V","Operating Temperature":"-55°C ~ 110°C","Zero Crossing Circuit":"No","Supplier Device Package":"4-SMD","Voltage - Forward (Vf) (Typ)":"1.2V","Current - DC Forward (If) (Max)":"50 mA","Current - LED Trigger (Ift) (Max)":"10mA","Current - On State (It (RMS)) (Max)":"100 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.14","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.14000","currency":"USD"},{"qty":10,"price":"$0.72200","currency":"USD"},{"qty":100,"price":"$0.53440","currency":"USD"},{"qty":500,"price":"$0.49106","currency":"USD"},{"qty":1000,"price":"$0.40440","currency":"USD"},{"qty":2000,"price":"$0.38419","currency":"USD"},{"qty":6000,"price":"$0.37552","currency":"USD"},{"qty":10000,"price":"$0.36685","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/e11085510bee972151b7c5c68c7ea563.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the dV/dt rating of VOT8121AB-T1?","answer":"The minimum static dV/dt is 1 kV/µs. This is the guaranteed slew rate the triac output can block without false turn-on — important for inductive load switching."},{"question":"Is VOT8121AB-T1 zero crossing?","answer":"No, this part has no zero-crossing circuit. It turns on immediately when the LED current exceeds the 10 mA maximum trigger current (Ift), allowing random-phase control."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/VOT8121AB-T1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/VOT8121AB-T1 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}}