{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STD40NF03LT4","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STD40NF03LT4","canonicalUrl":"https://icboms.com/stmicroelectronics/STD40NF03LT4","factsUrl":"https://icboms.com/api/mcp/products/STD40NF03LT4","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STripFET™ II, STD40NF03LT4, N-Channel MOSFET, 30 Vdss, 40 A continuous drain, 11 mOhm Rds(on) at 20 A, DPAK, -55 to 175 °C.","salesMarkdown":"## 30 V, 40 A N-channel — what the DPAK carries ## On-resistance and gate charge — the switching trade-off The 11 mOhm Rds(on) at 20 A keeps conduction losses low in a 30 V rail — useful for load switches, low-voltage motor drives, or DC-DC converter synchronous rectification. ## 175 °C junction — field-repair margin That 175 °C ceiling gives headroom in a cramped enclosure or under-hood environment where ambient can hit 105 °C and self-heating adds another 30–40 °C. The DPAK copper tab needs a good solder pad and via array to the inner-layer copper to keep the thermal resistance low. That means STMicroelectronics has flagged it for eventual phase-out — no last-time-buy date is published in the available records, but new designs should not start with this part. Existing production can continue sourcing through independent distribution while stock lasts.","metaTitle":"STD40NF03LT4 N-Channel MOSFET, 30 V, 40 A, DPAK","metaDescription":"STD40NF03LT4 N-Channel MOSFET, 30 Vdss, 40 A continuous drain, 11 mOhm Rds(on) at 20 A. NRND lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Series":"STripFET™ II","Package":"Tape & Reel (TR) Cut Tape (CT)","FET Type":"N-Channel","Vgs (Max)":"±20V","Technology":"MOSFET (Metal Oxide)","FET Feature":"-","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","Product Status":"Active","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"1V @ 250µA","Base Product Number":"STD40","Operating Temperature":"-55°C ~ 175°C (TJ)","Rds On (Max) @ Id, Vgs":"11mOhm @ 20A, 10V","Power Dissipation (Max)":"80W (Tc)","Supplier Device Package":"DPAK","Gate Charge (Qg) (Max) @ Vgs":"30 nC @ 5 V","Drain to Source Voltage (Vdss)":"30 V","Input Capacitance (Ciss) (Max) @ Vds":"1440 pF @ 25 V","Drive Voltage (Max Rds On, Min Rds On)":"5V, 10V","Current - Continuous Drain (Id) @ 25°C":"40A (Tc)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.2500","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STD40NF03LT4/alternatives.json"},"ai":{"faq":[{"question":"Is STD40NF03LT4 obsolete or recommended for new designs?","answer":"It is not yet formally discontinued, but STMicroelectronics has flagged it for phase-out. New designs should select a current-production alternative; existing BOM lines can continue to source through independent distribution while inventory remains."},{"question":"What is the replacement or equivalent for STD40NF03LT4?","answer":"A same-function N-channel MOSFET in DPAK with similar Vds (30 V), Id (40 A), and Rds(on) (11 mOhm range) from ST's current STripFET portfolio would be the logical cross-shop — confirm the gate charge and threshold voltage match the drive circuit before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STD40NF03LT4","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STD40NF03LT4 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}}