{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"T1635H-8T","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"T1635H-8T","canonicalUrl":"https://icboms.com/stmicroelectronics/T1635H-8T","factsUrl":"https://icboms.com/api/mcp/products/T1635H-8T","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics T1635H-8T standard TRIAC, ECOPACK®2 series, 800 V off-state, 16 A RMS on-state, 35 mA gate trigger, TO-220-3 through-hole package, -40°C to 125°C junction temperature.","salesMarkdown":"## 800 V / 16 A standard TRIAC for mains switching The STMicroelectronics T1635H-8T is a standard TRIAC in the ECOPACK®2 series, rated for 800 V off-state voltage and 16 A RMS on-state current. Packaged in a TO-220-3 through-hole case, it is designed for AC load switching in industrial and commercial equipment such as motor drives, lighting ballasts, heating controls, and solid-state relays. The 35 mA maximum gate trigger current (Igt) and 1.3 V maximum gate trigger voltage (Vgt) define the drive requirements for the control circuit, typically an optocoupler or a low-power transistor driver. ## Gate drive and surge handling With a maximum gate trigger current of 35 mA, the T1635H-8T requires a gate drive capable of sourcing that current at the 1.3 V threshold. This is a standard drive level for a 16 A triac, compatible with most optocoupler output stages or a small-signal transistor. The hold current (Ih) is also 35 mA maximum, meaning the load must draw at least that much to keep the triac latched after the gate pulse ends — a consideration for low-current loads like small fans or indicator lamps where a minimum load resistor may be needed. For inrush or fault conditions, the non-repetitive surge current rating is 160 A at 50 Hz and 168 A at 60 Hz. This covers the typical cold-start inrush of a motor or the charging current of a capacitive load, but the single-pulse nature of the rating means repeated surges will accumulate damage — the designer should size the triac so that the worst-case inrush stays within the surge capability with margin. The TO-220-3 through-hole package allows for heatsink attachment via the metal tab, which is electrically isolated from the die but should be considered in the thermal design — the 16 A RMS rating assumes adequate heatsinking, not free-air operation. The package is ROHS3 compliant and lead-free per the ECOPACK®2 designation.","metaTitle":"STMicroelectronics T1635H-8T TRIAC, 800 V, 16 A, TO-220-3","metaDescription":"Standard TRIAC from STMicroelectronics, 800 V off-state voltage, 16 A RMS on-state current, 35 mA gate trigger. TO-220-3 through-hole package. ROHS3 compliant.","metaKeywords":null},"attributes":{"series":"ECOPACK®2","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"ECOPACK®2","Package":"Tube","Triac Type":"Standard","Configuration":"Single","Mounting Type":"Through Hole","Package / Case":"TO-220-3","lifecycle_stage":"eol_hot","Voltage - Off State":"800 V","Operating Temperature":"-40°C ~ 125°C (TJ)","Supplier Device Package":"TO-220","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)":"16 A","Current - Non Rep. Surge 50, 60Hz (Itsm)":"160A, 168A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.61","priceTiers":[{"qty":1,"price":"$1.61000","currency":"USD"},{"qty":10,"price":"$1.43600","currency":"USD"},{"qty":100,"price":"$1.11980","currency":"USD"},{"qty":500,"price":"$0.92504","currency":"USD"},{"qty":1000,"price":"$0.80378","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/2b9f306f392dcb183775a82a0e701366.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/T1635H-8T/alternatives.json"},"ai":{"faq":[{"question":"What is the gate trigger current of T1635H-8T?","answer":"The maximum gate trigger current (Igt) is 35 mA, with a maximum gate trigger voltage (Vgt) of 1.3 V. These values define the minimum drive required from the control circuit to switch the triac on."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/T1635H-8T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/T1635H-8T 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}}