{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH40P03SFP","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH40P03SFP","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH40P03SFP","factsUrl":"https://icboms.com/api/mcp/products/STTH40P03SFP","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH40P03SFP, standard recovery diode, 300 V reverse voltage, 40 A average rectified current, 1.1 V forward voltage at 40 A, TO-220-3 Full Pack, through-hole mounting.","salesMarkdown":"## 40 A, 300 V standard recovery diode in a fully isolated TO-220FP The STMicroelectronics STTH40P03SFP is a standard recovery rectifier diode rated for 300 V DC reverse voltage and 40 A average rectified current, housed in a TO-220-3 Full Pack (TO-220FP) through-hole package. Forward voltage is specified at 1.1 V at 40 A, with a reverse leakage of 50 µA at 300 V. The junction temperature maximum is 175°C. Recovery time is standard recovery (>500 ns, >200 mA), placing this part in the line-frequency rectification class rather than fast-switching applications. ## Obsolete — no direct ST replacement on record For a production BOM line, the practical path is either to qualify a functionally equivalent standard-recovery 300 V, 40 A diode in a TO-220FP package from another manufacturer, or to source remaining stock through independent distribution. Date-code provenance matters here — stock surfacing well after the last-time-buy window should be verified against the manufacturer PCN before accepting into inventory. The standard recovery classification (>500 ns, >200 mA) tells you this diode is optimised for 50/60 Hz line-frequency rectification, not for high-frequency switching supplies or PFC stages. In a 300 V, 40 A bulk rectifier role — think input bridge in a power supply, battery charger output, or motor drive DC bus — the slower recovery is fine and typically yields a lower forward voltage drop than an ultrafast part at the same current. If the design calls for switching above a few kilohertz, this part will have excessive reverse recovery losses; an ultrafast or hyperfast diode would be the correct choice. ## Package and mounting — TO-220FP isolated tab The TO-220-3 Full Pack (supplier device package TO-220FP) is a through-hole package with a fully encapsulated metal tab. This saves assembly time and improves thermal transfer, but the thermal resistance junction-to-case is typically higher than a non-isolated TO-220 — budget for heatsink sizing accordingly. The three through-hole leads are on the standard 2.54 mm pitch and fit a common TO-220 footprint.","metaTitle":"STTH40P03SFP Standard Recovery Diode, 300V 40A TO-220FP","metaDescription":"STMicroelectronics STTH40P03SFP standard recovery diode, 300V reverse voltage, 40A average rectified current, TO-220-3 Full Pack.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Speed":"Standard Recovery >500ns, > 200mA (Io)","Series":"-","Package":"Tube","Diode Type":"Standard","Mounting Type":"Through Hole","Package / Case":"TO-220-3 Full Pack","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STTH40","Capacitance @ Vr, F":"-","Supplier Device Package":"TO-220FP","Current - Reverse Leakage @ Vr":"50 µA @ 300 V","Voltage - DC Reverse (Vr) (Max)":"300 V","Current - Average Rectified (Io)":"40A","Operating Temperature - Junction":"175°C(Max)","Voltage - Forward (Vf) (Max) @ If":"1.1 V @ 40 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/48d925eabc1b49495da9e5679f17c062.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STTH40P03SFP/alternatives.json"},"ai":{"faq":[{"question":"Is STTH40P03SFP obsolete or EOL?","answer":"Yes, the STTH40P03SFP is listed with an obsolete product status."},{"question":"What is the difference between STTH40P03SFP and STTH40P03S?","answer":"The difference is the package. The STTH40P03SFP is the TO-220-3 Full Pack (fully isolated tab) variant, while the STTH40P03S is the standard TO-220 with a non-isolated tab that requires an insulating pad for heatsink mounting. Electrical specifications — 300 V reverse voltage, 40 A average current, 1.1 V forward voltage — are the same between the two."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH40P03SFP","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH40P03SFP 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}}