{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STD9NM40N","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STD9NM40N","canonicalUrl":"https://icboms.com/stmicroelectronics/STD9NM40N","factsUrl":"https://icboms.com/api/mcp/products/STD9NM40N","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics MDmesh™ II series, N-Channel MOSFET, 400 V Vdss, 5.6 A continuous drain at 25°C, 790 mOhm Rds(on) max at 10 V, DPAK (TO-252) package, surface mount.","salesMarkdown":"The STD9NM40N is an STMicroelectronics N-channel power MOSFET built on the MDmesh™ II high-voltage trench-gate platform. This part is packaged in a DPAK (TO-252) surface-mount case, suited for automated assembly on power-supply and offline-converter boards. ## NRND — plan a last-time buy or a design-in alternate This is an official signal from ST that the part is in phase-out — it remains available for existing production but is not intended for new design starts. Buyers supporting active BOM lines should secure last-time-buy quantities or evaluate a pin-compatible replacement. ## DPAK footprint and thermal management The DPAK (TO-252) package occupies a standard surface-mount land pattern, with the tab as the drain connection and a thermal pad area that carries the bulk of the dissipation. A via-stitched copper pad under the tab is recommended to spread heat. The ±25 V maximum gate-source voltage is a standard limit; the drive voltage for achieving the rated on-resistance is 10 V, but the part can be driven with lower gate voltages if the increased Rds(on) is acceptable.","metaTitle":"STD9NM40N N-Channel MOSFET, 400 V, 5.6 A, DPAK","metaDescription":"STD9NM40N from STMicroelectronics MDmesh II series: N-channel 400 V, 5.6 A MOSFET in DPAK. Rds(on) 790 mOhm max at 10 V. RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"MDmesh™ II","Package":"Tape & Reel (TR); Cut Tape (CT)","FET Type":"N-Channel","Vgs (Max)":"±25V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","Product Status":"Not For New Designs","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"4V @ 250µA","Base Product Number":"STD9NM40","Operating Temperature":"150°C(TJ)","Rds On (Max) @ Id, Vgs":"790mOhm @ 2.5A, 10V","Power Dissipation (Max)":"60W (Tc)","Supplier Device Package":"DPAK","Gate Charge (Qg) (Max) @ Vgs":"14 nC @ 10 V","Drain to Source Voltage (Vdss)":"400 V","Input Capacitance (Ciss) (Max) @ Vds":"365 pF @ 50 V","Drive Voltage (Max Rds On, Min Rds On)":"10V","Current - Continuous Drain (Id) @ 25°C":"5.6A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.6700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/95716834948deb8ece6f32c42872d6a3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STD9NM40N/alternatives.json"},"ai":{"faq":[{"question":"What is the exact Rds(on) of STD9NM40N?","answer":"The maximum on-resistance is 790 mOhm at a drain current of 2.5 A and a gate-source voltage of 10 V."},{"question":"What is the footprint of STD9NM40N?","answer":"The package is DPAK (TO-252), a surface-mount package with two leads plus a tab. The supplier device package code is DPAK."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STD9NM40N","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STD9NM40N 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}}