{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH3R04S","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH3R04S","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH3R04S","factsUrl":"https://icboms.com/api/mcp/products/STTH3R04S","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH3R04S, Fast Recovery Diode, Standard type, 400 V DC reverse, 3 A average rectified, 35 ns reverse recovery time, DO-214AB (SMC) package, Surface Mount, 175°C junction temperature.","salesMarkdown":"## 35 ns trr — the switching-speed anchor for PFC and flyback The STTH3R04S is a 400 V, 3 A fast recovery diode from STMicroelectronics, built for the boost stage of power-factor correction and the secondary side of flyback converters where reverse recovery time sets the switching loss floor. Its 35 ns trr at rated current keeps the recovery charge low enough to run continuous-conduction-mode PFC above 100 kHz without excessive dissipation in the MOSFET or the diode itself. ## Forward drop and leakage at the operating point At 3 A forward current the maximum forward voltage is 1.5 V — this is the conduction-loss number for the thermal budget at full load. Reverse leakage is specified at 5 µA at the 400 V reverse standoff, which is the figure to use for off-state power dissipation in high-line PFC stages where the diode blocks the full rectified DC bus. ## Package, marking, and reflow considerations The SMC body is larger than the smaller SMA/SMB siblings, so the stencil aperture and paste volume should match the pad geometry in the ST application note for the STTH3 series — the tab's solder joint is the primary thermal path. The part is marked with the base number STTH3 and a date-code laser etch; the font consistency on the SMC epoxy body is a quick authenticity check against re-marked stock. No official second-source cross-reference is published by ST, so for dual-sourcing the buyer should qualify a parametric equivalent from another fast-recovery diode family — the 35 ns trr and 400 V rating are the binding specs, not the package code.","metaTitle":"STTH3R04S 400V 3A Fast Recovery Diode, 35 ns trr, SMC","metaDescription":"STMicroelectronics STTH3R04S: 400V, 3A fast recovery diode, 35 ns trr, 175°C Tj, DO-214AB (SMC). Active, ROHS3.","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-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"STTH3","Capacitance @ Vr, F":"-","Supplier Device Package":"SMC","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":"$0.9400","priceTiers":[{"qty":1,"price":"$0.94000","currency":"USD"},{"qty":10,"price":"$0.82900","currency":"USD"},{"qty":100,"price":"$0.63540","currency":"USD"},{"qty":500,"price":"$0.50226","currency":"USD"},{"qty":1000,"price":"$0.41072","currency":"USD"},{"qty":2500,"price":"$0.41072","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/b3471ccdfc6412c132f7c671cc95fd59.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STTH3R04S/alternatives.json"},"ai":{"faq":[{"question":"What is the reverse recovery time of the STTH3R04S?","answer":"The reverse recovery time (trr) is 35 ns, specified at the 3 A forward current and 400 V reverse voltage. This is the fast-recovery rating that qualifies it for hard-switching PFC and flyback applications above 100 kHz."},{"question":"Is STTH3R04S RoHS compliant?","answer":"Yes, the STTH3R04S is ROHS3 Compliant per the lifecycle record, meeting the current exemption limits for lead-free assembly."},{"question":"Is the STTH3R04S equivalent to the BYV26C?","answer":"No direct manufacturer cross-reference between the STTH3R04S and the BYV26C is published. Both are 400 V fast-recovery diodes, but the BYV26C is a through-hole part (DO-41 package) with a different trr specification — the STTH3R04S is a surface-mount SMC device. They are not pin-compatible and should not be treated as drop-in equivalents without full parametric and footprint review."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH3R04S","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH3R04S 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}}