{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"T435-800H","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"T435-800H","canonicalUrl":"https://icboms.com/stmicroelectronics/T435-800H","factsUrl":"https://icboms.com/api/mcp/products/T435-800H","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics Snubberless™ Alternistor triac, T435-800H, 800 V off-state, 4 A RMS on-state, single configuration, through-hole TO-251 (IPAK) package, tube.","salesMarkdown":"## 4 A RMS, 800 V off-state — Snubberless alternistor for inductive loads The STMicroelectronics T435-800H is a 4 A RMS Snubberless™ alternistor triac rated for 800 V off-state voltage, designed for switching AC loads without an external snubber network. The Snubberless structure handles high dV/dt during commutation, making it suitable for inductive loads like small motors, solenoids, and transformers where a standard triac would false-trigger. Housed in a through-hole TO-251 (IPAK) package, the device suits compact board-level assemblies where a heatsink can be soldered or clipped to the exposed tab. The single triac configuration simplifies layout for one-phase AC switching. ## Gate drive and surge handling — what the trigger currents mean for your circuit Maximum gate trigger current (Igt) is 35 mA, with a maximum gate trigger voltage (Vgt) of 1.3 V. A logic-level MCU output driving an optocoupler or a small bipolar transistor can fire the gate directly — no high-current driver IC needed. The 35 mA maximum hold current (Ih) means the triac latches on until the load current drops below that threshold near the AC zero-cross. Non-repetitive surge current (Itsm) is 30 A at 50 Hz and 31 A at 60 Hz, covering inrush events from capacitive or filamentary loads. The 800 V off-state rating provides margin on a 230 VAC line (peak ~325 V) and even on 277 VAC (peak ~392 V), reducing risk from mains transients. RoHS3 compliance is confirmed, covering the EU RoHS exemption framework through 2024.","metaTitle":"STMicroelectronics T435-800H Snubberless Triac","metaDescription":"STMicroelectronics T435-800H Alternistor triac, 800V off-state voltage, 4A RMS on-state current. Snubberless design, TO-251 through-hole package.","metaKeywords":null},"attributes":{"series":"Snubberless™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"Snubberless™","Package":"Tube","Triac Type":"Alternistor - Snubberless","Configuration":"Single","Mounting Type":"Through Hole","Package / Case":"TO-251-3 Short Leads, IPak, TO-251AA","lifecycle_stage":"eol_hot","Voltage - Off State":"800 V","Operating Temperature":"-40°C ~ 125°C (TJ)","Supplier Device Package":"TO-251 (IPAK)","Current - Hold (Ih) (Max)":"35 mA","Current - Gate Trigger (Igt) (Max)":"35 mA","Voltage - Gate Trigger (Vgt) (Max)":"1.3 V","Current - On State (It (RMS)) (Max)":"4 A","Current - Non Rep. Surge 50, 60Hz (Itsm)":"30A, 31A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.38","priceTiers":[{"qty":1,"price":"$1.38000","currency":"USD"},{"qty":10,"price":"$1.12800","currency":"USD"},{"qty":100,"price":"$0.87720","currency":"USD"},{"qty":500,"price":"$0.74358","currency":"USD"},{"qty":1000,"price":"$0.60572","currency":"USD"},{"qty":2000,"price":"$0.57021","currency":"USD"},{"qty":5000,"price":"$0.54306","currency":"USD"},{"qty":10000,"price":"$0.51799","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/48084296574f91b045b9c46f17354319.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/T435-800H/alternatives.json"},"ai":{"faq":[{"question":"Will the T435-800H drop into a board designed for the T435-600H without changes?","answer":"Yes — the T435-600H and T435-800H share the same package (TO-251), mounting type, and pinout as Snubberless alternistor triacs. The only difference is the off-state voltage: 800 V on the T435-800H versus 600 V on the T435-600H. No board layout or wiring changes are needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/T435-800H","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/T435-800H 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}}