{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TN4050-12PI","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"TN4050-12PI","canonicalUrl":"https://icboms.com/stmicroelectronics/TN4050-12PI","factsUrl":"https://icboms.com/api/mcp/products/TN4050-12PI","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics ECOPACK®2 standard-recovery SCR, TN4050-12PI, 1.2 kV off-state, 40 A RMS on-state, 400/420 A non-rep surge, TOP-3 through-hole package, tube.","salesMarkdown":"## 40 A RMS at 1.2 kV — the blocking and conduction budget The TN4050-12PI is a standard-recovery SCR rated for 40 A RMS on-state current and 1.2 kV off-state blocking voltage — the headline numbers that decide whether it handles the load current and withstands the peak bus voltage in a motor-drive snubber or battery-charger phase-control circuit. Non-repetitive surge capability is 400 A at 50 Hz and 420 A at 60 Hz, giving headroom for the inrush that flows when a discharged capacitor bank or cold filament hits the SCR before the gate is fully triggered. ## TOP-3 through-hole — board-fit and thermal path The TOP-3 package (also known as TOP3) is a through-hole power package with a metal tab that bolts directly to a heatsink or clips into a standard spring-clip heatsink — the junction-to-case thermal path is through the tab, so the PCB copper alone is not the primary heat spreader. ## Gate drive and holding current — what the trigger circuit needs to deliver Maximum gate trigger current is 50 mA and maximum gate trigger voltage is 1.5 V — the drive circuit must source at least this into the gate-cathode junction to guarantee turn-on across the full temperature range; a 100 mA gate pulse with a series resistor is a common margin. Holding current is 100 mA maximum — once the SCR is latched, the load current must stay above this threshold or the device will commutate off at the next zero-crossing; this matters in lightly loaded phase-control circuits where the load current dips near the hold level. ROHS3 compliant and part of the ECOPACK®2 series, which means the package and plating meet the current RoHS exemption expiry schedule without a time-limited exemption — no need to track a sunset date for the BOM.","metaTitle":"STMicroelectronics TN4050-12PI SCR, 40 A RMS, 1.2 kV, TOP-3","metaDescription":"STMicroelectronics TN4050-12PI standard-recovery SCR, 40 A RMS at 1.2 kV, 400 A surge, TOP-3 through-hole. Active, ROHS3. Quoted to order.","metaKeywords":null},"attributes":{"series":"ECOPACK®2","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"ECOPACK®2","Package":"Tube","SCR Type":"Standard Recovery","Mounting Type":"Through Hole","Package / Case":"TOP-3","lifecycle_stage":"eol_hot","Voltage - Off State":"1.2 kV","Operating Temperature":"-40°C ~ 125°C (TJ)","Supplier Device Package":"TOP3","Current - Hold (Ih) (Max)":"100 mA","Current - Off State (Max)":"10 µA","Voltage - On State (Vtm) (Max)":"1.75 V","Current - Gate Trigger (Igt) (Max)":"50 mA","Current - On State (It (AV)) (Max)":"25 A","Voltage - Gate Trigger (Vgt) (Max)":"1.5 V","Current - On State (It (RMS)) (Max)":"40 A","Current - Non Rep. Surge 50, 60Hz (Itsm)":"400A, 420A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.03","priceTiers":[{"qty":1,"price":"$4.03000","currency":"USD"},{"qty":10,"price":"$3.61500","currency":"USD"},{"qty":100,"price":"$2.96220","currency":"USD"},{"qty":500,"price":"$2.52168","currency":"USD"},{"qty":1000,"price":"$2.50792","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0fe25c7b6662e27c667794e524a6312d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/TN4050-12PI/alternatives.json"},"ai":{"faq":[{"question":"How does TN4050-12PI compare to the lower-voltage TN3015H-6I?","answer":"The TN3015H-6I is a 600 V SCR in the same ECOPACK®2 series and TOP-3 package, but with a lower 15 A RMS on-state current and a 150°C maximum junction temperature. The TN4050-12PI offers higher voltage blocking (1.2 kV) and higher current (40 A RMS) at a 125°C junction limit — the choice depends on whether the bus voltage exceeds 600 V and whether the load current fits the lower-rated part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/TN4050-12PI","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/TN4050-12PI 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}}