{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VOT8121AM-VT","brand":"Vishay","brandSlug":"vishay","productSlug":"VOT8121AM-VT","canonicalUrl":"https://icboms.com/vishay/VOT8121AM-VT","factsUrl":"https://icboms.com/api/mcp/products/VOT8121AM-VT","rawCanonicalId":null},"summary":{"shortDescription":"VOT8121AM-VT phototriac optocoupler, 1-channel, Triac output, 800 V off-state, 3750 Vrms isolation, 30 µs turn-on, 1 kV/µs dV/dt, Surface Mount 4-SMD Gull Wing package, -55°C to 110°C, ROHS3 compliant.","salesMarkdown":"## 800 V off-state — what it means for AC switching The VOT8121AM-VT is a single-channel phototriac optocoupler from the VOT8121 family, designed for isolated AC load switching in industrial and appliance controls. Its 800 V off-state voltage rating gives comfortable margin for 240 V AC line switching (peak ~340 V) and even 277 V AC (peak ~392 V), with headroom for transient spikes. The output is a Triac rated for 100 mA RMS on-state current — sized for low-power loads like solid-state relays, small solenoids, or triac gate drives. ## No zero-crossing — expect random-phase turn-on This part has no zero-crossing circuit, meaning the Triac fires immediately when the LED current exceeds the 10 mA trigger threshold, regardless of the AC line phase. That gives you random-phase turn-on, useful for phase-angle dimming or fast switching where you cannot wait for the next zero-cross. If your design requires zero-cross switching to reduce inrush or EMI, you would look at a different variant in the VOT8121 family that includes that feature. ## 1 kV/µs dV/dt — false-trigger immunity in noisy environments The minimum static dV/dt of 1 kV/µs means the output Triac will not falsely trigger from fast voltage transients on the AC line — common in motor drives, relay coil switching, or inductive load environments. This is a key parameter for reliability in industrial panels or HVAC controls where line noise is the norm. ## Temperature range and isolation The 3750 Vrms isolation voltage meets reinforced insulation requirements for safety-rated AC mains interfaces, backed by cUR, UR, and VDE approvals. ## Package and ordering options Supplied in a 4-pin SOP Gull Wing surface-mount package (4-SMD, Gull Wing; supplier device package 4-SOP). Available in Tape & Reel (TR) for automated pick-and-place or Cut Tape (CT) for prototype and low-volume builds. The forward voltage is 1.15 V typical, with a maximum LED drive current of 50 mA; hold current is 250 µA typical. ## Lifecycle and compliance ROHS3 compliant, with cUR, UR, and VDE agency approvals.","metaTitle":"VOT8121AM-VT Phototriac Optocoupler, 800 V Off-State","metaDescription":"VOT8121AM-VT phototriac optocoupler: 800 V off-state, 3750 Vrms isolation, 30 µs turn-on, 1 kV/µs dV/dt, -55°C to 110°C. Active, ROHS3 compliant.","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","Turn On Time":"30µs","Mounting Type":"Surface Mount","Package / Case":"4-SMD, Gull Wing","Approval Agency":"cUR, UR, VDE","lifecycle_stage":"eol_hot","Number of Channels":"1","Static dV/dt (Min)":"1kV/µs","Current - Hold (Ih)":"250µA (Typ)","Voltage - Isolation":"3750Vrms","Voltage - Off State":"800 V","Operating Temperature":"-55°C ~ 110°C","Zero Crossing Circuit":"No","Supplier Device Package":"4-SOP","Voltage - Forward (Vf) (Typ)":"1.15V","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":"$1.16000","currency":"USD"},{"qty":10,"price":"$0.73600","currency":"USD"},{"qty":100,"price":"$0.54500","currency":"USD"},{"qty":500,"price":"$0.50078","currency":"USD"},{"qty":1000,"price":"$0.41241","currency":"USD"},{"qty":3000,"price":"$0.39179","currency":"USD"},{"qty":6000,"price":"$0.38295","currency":"USD"},{"qty":15000,"price":"$0.37412","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/fcc351ec1e72f717f48a6a4cf8463469.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does VOT8121AM-VT have zero crossing detection?","answer":"No, the VOT8121AM-VT does not have zero crossing detection. It is a random-phase phototriac — the output turns on immediately when the LED current exceeds the trigger threshold, regardless of the AC line phase."},{"question":"What is the minimum input current to trigger VOT8121AM-VT?","answer":"The maximum LED trigger current (Ift) is 10 mA. In practice, driving the LED with 10 mA to 15 mA ensures reliable turn-on across temperature and unit variation."},{"question":"Can VOT8121AM-VT be used for 240 V AC switching?","answer":"Yes. The 800 V off-state voltage rating provides ample margin for 240 V AC (peak ~340 V) and even 277 V AC (peak ~392 V). The on-state current rating of 100 mA RMS limits the load to low-power devices like small relays, indicator lamps, or gate drive circuits."},{"question":"Is VOT8121AM-VT RoHS compliant?","answer":"Yes, it is ROHS3 compliant, meeting the latest RoHS directive requirements."},{"question":"What is the closest pin-compatible alternative to VOT8121AM-VT?","answer":"Within the same VOT8121 family, other variants differ primarily by zero-crossing feature and trigger current. The VOT8121AM-VT is the random-phase (non-zero-crossing) version. For a zero-crossing variant, look for a part with 'Z' in the suffix within the same family — pin-compatible in the same 4-SOP footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/VOT8121AM-VT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/VOT8121AM-VT 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}}