{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"T635T-8FP","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"T635T-8FP","canonicalUrl":"https://icboms.com/stmicroelectronics/T635T-8FP","factsUrl":"https://icboms.com/api/mcp/products/T635T-8FP","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics Snubberless™ T635T-8FP Alternistor triac, 800 V off-state, 6 A RMS on-state, TO-220-3 Full Pack, Through Hole, -40°C to 150°C.","salesMarkdown":"## 800 V blocking for 230 VAC line switching The T635T-8FP is an STMicroelectronics Snubberless™ Alternistor triac rated for 800 V off-state voltage. Its 6 A RMS on-state current suits continuous loads like small motors, heaters, or solenoid valves in industrial and appliance environments. ## Gate drive requirements and trigger margin With a maximum gate trigger current of 35 mA and gate trigger voltage of 1.3 V, the T635T-8FP requires a drive source capable of delivering at least 35 mA at the gate threshold. ## Inrush and surge handling for load start-up The non-repetitive surge current rating is 45 A at 50 Hz and 47 A at 60 Hz. This covers the inrush from a 60 W incandescent lamp or a 0.5 HP motor start, but a capacitive load (e.g., LED driver input) may exceed that peak — derate the load accordingly. ## Snubberless™ design: no external RC needed The Snubberless™ series is designed to commutate inductive loads without an external snubber network, saving two passive components and board area. ## Package and thermal path: TO-220 Full Pack The TO-220-3 Full Pack (TO-220FPAB) isolates the tab electrically, so no insulating washer is needed between the device and the heatsink. The full-pack plastic body has higher thermal resistance than a standard TO-220 — plan for a heatsink if the RMS current exceeds 3 A continuous at 25°C ambient.","metaTitle":"ST T635T-8FP Snubberless Triac, Alternistor, 800 V, 6 A","metaDescription":"ST T635T-8FP Alternistor triac, 800 V off-state, 6 A RMS, Snubberless series for 230 VAC motor/load switching. Active life-cycle, ROHS3.","metaKeywords":null},"attributes":{"series":"Snubberless™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"Snubberless™","Package":"Tube","Triac Type":"Alternistor - Snubberless","Configuration":"Single","Mounting Type":"Through Hole","Package / Case":"TO-220-3 Full Pack","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"T635","Voltage - Off State":"800 V","Operating Temperature":"-40°C~150°C(TJ)","Supplier Device Package":"TO-220FPAB","Current - Hold (Ih) (Max)":"40 mA","Current - Gate Trigger (Igt) (Max)":"35 mA","Voltage - Gate Trigger (Vgt) (Max)":"1.3 V","Current - On State (It (RMS)) (Max)":"6 A","Current - Non Rep. Surge 50, 60Hz (Itsm)":"45A, 47A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5300","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.53000","currency":"USD"},{"qty":10,"price":"$1.36600","currency":"USD"},{"qty":100,"price":"$1.06470","currency":"USD"},{"qty":500,"price":"$0.87952","currency":"USD"},{"qty":1000,"price":"$0.76422","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/e5986dcd575e30053e5d98a26461d97e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does the T635T-8FP require a snubber circuit?","answer":"No — the Snubberless™ Alternistor design is rated for inductive load commutation without an external RC snubber, saving two passives per channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/T635T-8FP","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/T635T-8FP 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}}