{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STN3N40K3","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STN3N40K3","canonicalUrl":"https://icboms.com/stmicroelectronics/STN3N40K3","factsUrl":"https://icboms.com/api/mcp/products/STN3N40K3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SuperMESH3™ STN3N40K3, N-Channel MOSFET, 400V Vdss, 1.8A Id, 3.4Ohm Rds(on) @ 600mA/10V, SOT-223, -55°C to 150°C.","salesMarkdown":"## 400 V N-channel in a compact SOT-223 The STMicroelectronics STN3N40K3 is an N-channel power MOSFET from the SuperMESH3™ series, rated for 400 V drain-source voltage and 1.8 A continuous drain current at case temperature. It comes in a surface-mount SOT-223 package (TO-261-4), making it a fit for space-constrained offline power supplies, auxiliary converters, and LED lighting drivers where board area is tight. The 3.4 Ohm maximum on-resistance at 600 mA and 10 V gate drive gives a reasonable conduction loss for a part this size. The 11 nC gate charge at 10 V means a small-signal MOSFET driver or a PWM controller output can switch it without a dedicated driver stage. Operating junction temperature spans -55°C to 150°C, so the part is at home in avionics, downhole instrumentation, or outdoor telecom gear where the ambient can swing wide. The 165 pF input capacitance at 50 V drain-source keeps switching losses moderate in the 50-150 kHz range typical of flyback converters. ## Lifecycle and sourcing The STN3N40K3 is listed as Active with ROHS3 compliance.","metaTitle":"STN3N40K3 MOSFET, N-Channel 400V 1.8A SOT-223, Active","metaDescription":"STMicroelectronics STN3N40K3 N-channel MOSFET, 400V Vdss, 1.8A Id, 3.4Ohm Rds(on), SOT-223, -55 to 150°C. Active, ROHS3.","metaKeywords":null},"attributes":{"series":"SuperMESH3™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"Series":"SuperMESH3™","Package":"Tape & Reel (TR); Cut Tape (CT)","FET Type":"N-Channel","Vgs (Max)":"±30V","Technology":"MOSFET (Metal Oxide)","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"4.5V @ 50µA","Operating Temperature":"-55°C ~ 150°C (TJ)","Rds On (Max) @ Id, Vgs":"3.4Ohm @ 600mA, 10V","Power Dissipation (Max)":"3.3W (Ta)","Supplier Device Package":"SOT-223","Gate Charge (Qg) (Max) @ Vgs":"11 nC @ 10 V","Drain to Source Voltage (Vdss)":"400 V","Input Capacitance (Ciss) (Max) @ Vds":"165 pF @ 50 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"1.8A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.85","priceTiers":[{"qty":1,"price":"$0.85000","currency":"USD"},{"qty":10,"price":"$0.74500","currency":"USD"},{"qty":100,"price":"$0.57120","currency":"USD"},{"qty":500,"price":"$0.45156","currency":"USD"},{"qty":1000,"price":"$0.37275","currency":"USD"},{"qty":4000,"price":"$0.37275","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/7a9008d062e85fc91bb6d4085ccc3bda.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STN3N40K3/alternatives.json"},"ai":{"faq":[{"question":"What are the specifications of STN3N40K3?","answer":"It is an N-channel MOSFET rated for 400 V drain-source voltage, 1.8 A continuous drain current at case temperature, 3.4 Ohm maximum on-resistance at 600 mA and 10 V gate drive, 11 nC gate charge at 10 V, and 165 pF input capacitance at 50 V. It operates from -55°C to 150°C junction temperature and comes in a SOT-223 package."},{"question":"Can I use STN3N40K3 to replace a failed MOSFET in a power supply?","answer":"If the original MOSFET is an N-channel device rated for at least 400 V and 1.8 A in a SOT-223 or similar footprint, this part is a candidate. Verify the gate drive voltage — it needs 10 V to achieve the rated Rds(on). Also check the gate threshold (4.5 V max) and the pinout of the SOT-223 package against the original."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STN3N40K3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STN3N40K3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:51:14.863Z","lastPublished":"2026-07-22T18:51:14.863Z","indexable":true}}