{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STFW1N105K3","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STFW1N105K3","canonicalUrl":"https://icboms.com/stmicroelectronics/STFW1N105K3","factsUrl":"https://icboms.com/api/mcp/products/STFW1N105K3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SuperMESH3™ N-Channel MOSFET, 1050 V Vdss, 1.4 A Id, 11 Ohm Rds(on) @ 600 mA, 10 V, TO-3P-3 Full Pack, Through Hole, -55°C to 150°C.","salesMarkdown":"## High-voltage N-channel MOSFET for power conversion The STFW1N105K3: The 11 Ohm maximum on-resistance at 600 mA gate drive of 10 V keeps conduction losses manageable in high-voltage off-line power supplies, LED lighting drivers, and auxiliary converters where the primary-side switch sees rectified mains. ## Key ratings for the BOM decision The 1050 V Vdss rating provides margin above rectified mains rails and covers universal-input flyback converters with reflected voltage. The 1.4 A continuous current is sized for auxiliary windings and lower-power stages; the 20 W power dissipation ceiling at case temperature sets the thermal budget for the heatsink design. Gate charge of 13 nC at 10 V is modest, keeping driver losses low in switching frequencies up to 100 kHz. The ±30 V maximum gate-source voltage gives good noise immunity on the gate drive, but the recommended drive voltage for rated Rds(on) is 10 V.","metaTitle":"STFW1N105K3 N-Channel MOSFET, 1050 V, 1.4 A, TO-3PF","metaDescription":"STMicroelectronics STFW1N105K3 SuperMESH3 N-channel MOSFET, 1050 V Vdss, 1.4 A Id, 11 Ohm Rds(on), TO-3P-3 Full Pack. NRND status.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"SuperMESH3™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±30V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Through Hole","Package / Case":"TO-3P-3 Full Pack","Product Status":"Not For New Designs","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"4.5V @ 50µA","Base Product Number":"STFW1","Operating Temperature":"-55°C ~ 150°C (TJ)","Rds On (Max) @ Id, Vgs":"11Ohm @ 600mA, 10V","Power Dissipation (Max)":"20W (Tc)","Supplier Device Package":"TO-3PF","Gate Charge (Qg) (Max) @ Vgs":"13 nC @ 10 V","Drain to Source Voltage (Vdss)":"1050 V","Input Capacitance (Ciss) (Max) @ Vds":"180 pF @ 100 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"1.4A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.4421","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/41fa1efc881df8efc97e7347f8e9c7c7.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is STFW1N105K3 obsolete or still available?","answer":"It is not yet discontinued but is on the path to end of life; it remains available for existing production runs but is not recommended for new designs. Buyers should plan for a last-time buy or a replacement qualification."},{"question":"What is the replacement for STFW1N105K3?","answer":"A replacement will need to be selected from the SuperMESH3 family or a competitive high-voltage N-channel MOSFET with similar Vdss, current rating, and package (TO-3PF). Key parameters to match include the 1050 V Vdss, 1.4 A Id, 11 Ohm Rds(on), and gate charge characteristics."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STFW1N105K3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STFW1N105K3 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}}