{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"T4050-6PF","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"T4050-6PF","canonicalUrl":"https://icboms.com/stmicroelectronics/T4050-6PF","factsUrl":"https://icboms.com/api/mcp/products/T4050-6PF","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics Snubberless™ Alternistor triac, T4050-6PF, 40 A RMS on-state, 600 V off-state, 400 A non-repetitive surge, TO-3PF through-hole package, industrial temperature range.","salesMarkdown":"## 40 A RMS, 600 V — Snubberless™ Alternistor for inductive AC loads The STMicroelectronics T4050-6PF is a Snubberless™ Alternistor triac rated for 40 A RMS on-state current and 600 V off-state voltage, housed in a TO-3PF through-hole package. It is designed for AC power switching where inductive loads (motors, transformers, solenoids) generate high dV/dt stress. The Snubberless™ construction eliminates the external RC snubber network typically required with standard triacs, saving board space and BOM cost. ## Surge handling and thermal limits Non-repetitive surge current is rated at 420 A for 50 Hz and 400 A for 60 Hz half-cycle, giving headroom for motor start-up and capacitive inrush. The TO-3PF full-pack package isolates the tab, simplifying heatsink mounting without an insulating pad. ## Gate drive and holding current Maximum gate trigger current is 50 mA, with a maximum gate trigger voltage of 1.3 V, compatible with standard logic-level drivers or optocoupler outputs. The maximum holding current of 85 mA ensures the triac latches on cleanly with moderate load currents and does not drop out during load transients.","metaTitle":"STMicroelectronics T4050-6PF Snubberless Triac, 40 A, 600 V","metaDescription":"STMicroelectronics T4050-6PF Snubberless™ Alternistor triac: 40 A RMS, 600 V off-state, 400 A surge, TO-3PF through-hole.","metaKeywords":null},"attributes":{"series":"Snubberless™","packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Logic ICs"],"specifications":{"Series":"Snubberless™","Package":"Tube","Triac Type":"Alternistor - Snubberless","Configuration":"Single","Mounting Type":"Through Hole","Package / Case":"TO-3P-3 Full Pack","lifecycle_stage":"eol_hot","Voltage - Off State":"600 V","Operating Temperature":"-40°C ~ 125°C (TJ)","Supplier Device Package":"TO-3PF","Current - Hold (Ih) (Max)":"85 mA","Current - Gate Trigger (Igt) (Max)":"50 mA","Voltage - Gate Trigger (Vgt) (Max)":"1.3 V","Current - On State (It (RMS)) (Max)":"40 A","Current - Non Rep. Surge 50, 60Hz (Itsm)":"420A, 400A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.55","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.55000","currency":"USD"},{"qty":10,"price":"$4.98200","currency":"USD"},{"qty":100,"price":"$4.08170","currency":"USD"},{"qty":500,"price":"$3.47468","currency":"USD"},{"qty":1000,"price":"$3.45572","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/afe17e1289454c769f120b7f77bb7373.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the exact specifications of T4050-6PF?","answer":"The T4050-6PF is a Snubberless™ Alternistor triac rated for 40 A RMS on-state current, 600 V off-state voltage, 400 A non-repetitive surge at 60 Hz, and 420 A at 50 Hz. Gate trigger current is 50 mA max, gate trigger voltage is 1.3 V max, and holding current is 85 mA max. It comes in a TO-3PF through-hole package."},{"question":"What is the replacement or equivalent for T4050-6PF?","answer":"Within the Snubberless™ family, the T3035H-8I is a lower-current (30 A) 800 V variant in a different package (TO-220I), and the T1235H-6I is a 12 A 600 V option. Neither is a direct pin-compatible replacement; the T4050-6PF is the 40 A 600 V TO-3PF variant in the series."},{"question":"How does T4050-6PF compare to other 40A triacs like BTA40?","answer":"The T4050-6PF is a Snubberless™ Alternistor, meaning it does not require an external RC snubber for inductive loads, unlike standard triacs such as the BTA40 series. This reduces BOM count and board area in motor-drive and transformer applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/T4050-6PF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/T4050-6PF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T10:39:33.080Z","lastPublished":"2026-07-16T10:39:33.080Z","indexable":true}}