{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STFI8N80K5","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STFI8N80K5","canonicalUrl":"https://icboms.com/stmicroelectronics/STFI8N80K5","factsUrl":"https://icboms.com/api/mcp/products/STFI8N80K5","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SuperMESH5™ series, N-Channel MOSFET, 800 V drain-source, 6 A continuous drain, 950 mOhm Rds(on) at 10 V, TO-262-3 full pack (I2PAKFP), through hole, -55°C to 150°C junction.","salesMarkdown":"The STMicroelectronics STFI8N80K5 is an 800 V, 6 A N-channel MOSFET from the SuperMESH5™ series, built on ST's avalanche-rugged strip layout technology. This part targets high-voltage offline power supplies, flyback converters, and auxiliary switched-mode circuits where 800 V blocking and moderate current (6 A) are needed, and where through-hole mounting suits the assembly flow. ## 950 mOhm on-resistance — what it means for conduction loss At 6 A full load, expect about 5.7 W dissipation from the channel alone, before switching losses. That puts the 25 W package power limit into perspective — the thermal margin is comfortable for a 6 A continuous load in a well-ventilated design, but a heatsink is mandatory for anything above light duty. ## Gate charge and input capacitance — switching speed considerations With a typical gate charge of 16.5 nC at 10 V and input capacitance of 450 pF at 100 V drain-source, this MOSFET is not a high-speed switcher but is well matched to 50–150 kHz hard-switched converters. The gate drive voltage is specified at 10 V for minimum Rds(on); driving it with a 5 V logic-level signal will roughly double the on-resistance, so plan the gate driver rail accordingly. For new designs, select a current-production 800 V N-channel MOSFET in a TO-262-3 or equivalent through-hole package.","metaTitle":"STFI8N80K5 MOSFET, 800 V N-Channel, 6 A, TO-262-3","metaDescription":"STFI8N80K5 is an 800 V, 6 A N-channel MOSFET from STMicroelectronics SuperMESH5 series. 950 mOhm Rds(on), TO-262-3 full pack.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"SuperMESH5™","Package":"Tube","FET Type":"N-Channel","Vgs (Max)":"±30V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Through Hole","Package / Case":"TO-262-3 Full Pack, I²Pak","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"5V @ 100µA","Base Product Number":"STFI8","Operating Temperature":"-55°C~150°C(TJ)","Rds On (Max) @ Id, Vgs":"950mOhm @ 3A, 10V","Power Dissipation (Max)":"25W (Tc)","Supplier Device Package":"I2PAKFP (TO-281)","Gate Charge (Qg) (Max) @ Vgs":"16.5 nC @ 10 V","Drain to Source Voltage (Vdss)":"800 V","Input Capacitance (Ciss) (Max) @ Vds":"450 pF @ 100 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"6A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.3800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1b6757bef9b553ee051594e6faf05b8b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is STFI8N80K5 obsolete?","answer":"Yes, the STFI8N80K5 is listed as Obsolete. STMicroelectronics has discontinued production, and no direct replacement is listed in the official record."},{"question":"What is the replacement for STFI8N80K5?","answer":"For a current-production alternative, look for an 800 V, 6 A N-channel MOSFET in a TO-262-3 full pack (I2PAKFP) package with similar Rds(on) and gate charge. The SuperMESH5 series has been superseded by newer generations, but pin-compatibility must be verified per the target footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STFI8N80K5","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STFI8N80K5 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}}