{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"T435-800B-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"T435-800B-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/T435-800B-TR","factsUrl":"https://icboms.com/api/mcp/products/T435-800B-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics Snubberless™ series, T435-800B-TR, Alternistor - Snubberless Triac, Single, 800 V Off-State, 4 A RMS On-State, Surface Mount, TO-252-3 DPAK, -40°C to 125°C.","salesMarkdown":"## What this Snubberless Alternistor triac is for The STMicroelectronics T435-800B-TR is a Snubberless™ Alternistor triac rated for 800 V off-state voltage and 4 A RMS on-state current in a surface-mount DPAK package. The Snubberless construction means it commutates inductive loads — motors, solenoids, transformers — without the external RC snubber network that standard triacs require, saving board space and two passives per phase. The Alternistor subtype (also called a high-commutation triac) gives better dV/dt immunity than a standard triac, which matters when switching inductive loads off at the zero-cross. Gate trigger current is 35 mA max, hold current 35 mA max, so a standard microcontroller GPIO with a transistor driver can fire it. ## 4 A RMS and 800 V — sizing the load The 4 A RMS on-state current is the continuous load limit at a given case temperature; derate from 125 °C junction downward. For a 230 VAC resistive heater or incandescent lamp, 4 A gives about 920 VA. For an inductive motor or valve, budget a 20–30 % derating for inrush and back-EMF, keeping the steady-state load under 3 A RMS. The 800 V off-state voltage covers 277 VAC line-to-neutral with a 2.5× safety margin for mains transients. The non-repetitive surge rating of 30 A at 50 Hz and 31 A at 60 Hz handles capacitor inrush or motor start events — a single-cycle surge, not a repetitive condition. ## DPAK package and mounting Housed in a TO-252-3 DPAK (DPak, SC-63) with two leads plus a tab. The tab is the main terminal (MT2) and carries the thermal path. Surface-mount assembly with the tab soldered to a copper plane on the PCB is expected; without that thermal relief, the junction temperature rises quickly above 1 A continuous. The DPAK footprint is shared with other Snubberless triacs in the same series, so a cross to a higher-current variant (e.g., T835-800B) is a board-layout compatible option if the load grows.","metaTitle":"STMicroelectronics T435-800B-TR Snubberless Triac","metaDescription":"STMicroelectronics T435-800B-TR Snubberless Alternistor triac, 800V off-state, 4A RMS, DPAK surface mount. ROHS3 compliant, active production.","metaKeywords":null},"attributes":{"series":"Snubberless™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"Snubberless™","Package":"Tape & Reel (TR); Cut Tape (CT)","Triac Type":"Alternistor - Snubberless","Configuration":"Single","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","lifecycle_stage":"eol_hot","Voltage - Off State":"800 V","Operating Temperature":"-40°C ~ 125°C (TJ)","Supplier Device Package":"DPAK","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":"$1.35","priceTiers":[{"qty":1,"price":"$1.35000","currency":"USD"},{"qty":10,"price":"$1.10400","currency":"USD"},{"qty":100,"price":"$0.85860","currency":"USD"},{"qty":500,"price":"$0.72774","currency":"USD"},{"qty":1000,"price":"$0.59283","currency":"USD"},{"qty":2500,"price":"$0.55808","currency":"USD"},{"qty":5000,"price":"$0.53150","currency":"USD"},{"qty":12500,"price":"$0.50697","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/48084296574f91b045b9c46f17354319.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/T435-800B-TR/alternatives.json"},"ai":{"faq":[{"question":"Is T435-800B-TR a snubberless alternistor triac?","answer":"Yes. The T435-800B-TR is classified as an Alternistor – Snubberless triac, meaning it can commutate inductive loads without an external RC snubber network."},{"question":"What is the maximum RMS current of T435-800B-TR?","answer":"The maximum RMS on-state current is 4 A. This is the continuous current rating at a given case temperature; derate for elevated ambient or inductive loads."},{"question":"Is T435-800B-TR ROHS compliant?","answer":"Yes, the T435-800B-TR is ROHS3 compliant."},{"question":"What is the gate trigger current for T435-800B-TR?","answer":"The maximum gate trigger current (Igt) is 35 mA. The maximum gate trigger voltage (Vgt) is 1.3 V."},{"question":"What is the maximum non-repetitive surge current of T435-800B-TR?","answer":"The non-repetitive surge current (Itsm) is 30 A at 50 Hz and 31 A at 60 Hz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/T435-800B-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/T435-800B-TR 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}}