{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH3R04U","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH3R04U","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH3R04U","factsUrl":"https://icboms.com/api/mcp/products/STTH3R04U","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH3R04U, Fast Recovery Diode, Standard, 400 V, 3 A, 35 ns trr, Surface Mount, DO-214AA (SMB)","salesMarkdown":"## 35 ns reverse recovery — what it buys in the switching loop The STTH3R04U is a 400 V, 3 A fast recovery rectifier from STMicroelectronics, built for continuous-conduction-mode PFC boost stages, flyback snubbers, and secondary-side output rectification where reverse recovery losses dominate the thermal budget. Its 35 ns trr at rated current keeps the turn-off energy low enough that the diode runs cooler than a standard recovery part in the same 3 A loop — a direct benefit for the heatsink area and the MOSFET's switching stress. ## 400 V / 3 A — sizing the primary-side rectifier Rated 400 V reverse and 3 A average forward current, this diode fits the boost rectifier in a universal-input PFC (90–265 VAC) or the output clamp in a 48 V telecom brick. The 1.5 V forward drop at 3 A is typical for a fast-recovery epitaxial structure — expect about 4.5 W conduction loss at full load, which the SMB package can dissipate with adequate copper area on the cathode tab. ## DO-214AA (SMB) — footprint and thermal reality The SMB case is a JEDEC-standard surface-mount package with a cathode tab that carries the heat into the PCB copper. For 3 A continuous at 175 °C junction, the board layout needs adequate copper area on the cathode side.","metaTitle":"STTH3R04U 400V 3A Fast Recovery Diode, 35 ns trr, SMB","metaDescription":"STTH3R04U is a 400 V, 3 A fast recovery rectifier with 35 ns trr in a DO-214AA (SMB) package. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Diode Type":"Standard","Mounting Type":"Surface Mount","Package / Case":"DO-214AA, SMB","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"STTH3","Capacitance @ Vr, F":"-","Supplier Device Package":"SMB","Reverse Recovery Time (trr)":"35 ns","Current - Reverse Leakage @ Vr":"5 µA @ 400 V","Voltage - DC Reverse (Vr) (Max)":"400 V","Current - Average Rectified (Io)":"3A","Operating Temperature - Junction":"175°C(Max)","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6200","priceTiers":[{"qty":1,"price":"$0.62000","currency":"USD"},{"qty":10,"price":"$0.54400","currency":"USD"},{"qty":100,"price":"$0.41740","currency":"USD"},{"qty":500,"price":"$0.32998","currency":"USD"},{"qty":1000,"price":"$0.26985","currency":"USD"},{"qty":2500,"price":"$0.26985","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b3471ccdfc6412c132f7c671cc95fd59.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STTH3R04U/alternatives.json"},"ai":{"faq":[{"question":"What is the reverse recovery time of STTH3R04U?","answer":"The STTH3R04U has a reverse recovery time (trr) of 35 ns at rated forward current and reverse voltage conditions. This fast recovery characteristic makes it suitable for high-frequency switching applications such as PFC boost converters and flyback snubbers where turn-off losses must be minimised."},{"question":"What package does STTH3R04U come in?","answer":"The STTH3R04U is supplied in the DO-214AA (SMB) surface-mount package. It is available in Tape & Reel (TR) for automated assembly and Cut Tape (CT) for smaller quantities."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH3R04U","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH3R04U when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}