{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH8R04G","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH8R04G","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH8R04G","factsUrl":"https://icboms.com/api/mcp/products/STTH8R04G","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH8R04G, Fast Recovery Diode, 400 V, 8 A, 50 ns trr, Surface Mount D2PAK (TO-263AB), -40°C to 175°C junction.","salesMarkdown":"## 50 ns reverse recovery — the switching-loop enabler The STTH8R04G is a 400 V, 8 A fast-recovery epitaxial diode from STMicroelectronics, built for hard-switching topologies where recovery charge and reverse recovery time directly impact efficiency and EMI. Its 50 ns trr places it in the ultrafast class, suitable for continuous-conduction-mode (CCM) power-factor-correction boost stages, output rectification in flyback converters, and snubber clamping in motor drives. The 400 V reverse voltage rating gives headroom for universal-input (85–265 VAC) PFC stages, while the 8 A average forward current suits 1–2 kW power supplies when properly heatsinked. The 1.5 V forward drop at 8 A is a typical ultrafast trade-off — lower than a SiC Schottky but higher than a standard recovery diode — so the designer budgets that conduction loss against the switching loss saved by the fast recovery. ## 175 °C junction — thermal budget for compact PFC That 175°C ceiling allows the diode to run hotter in a cramped power supply without derating the current — useful when the PFC inductor and bulk cap are sharing the same airflow-starved corner of the chassis. The D2PAK (TO-263AB) surface-mount package with its exposed tab needs a good thermal via stitch to the PCB copper plane; without it, the junction-to-board thermal resistance limits continuous current well below the 8 A rating. STMicroelectronics lists the STTH8R04G as obsolete. For new designs, a SiC Schottky diode in the same D2PAK footprint (e.g., 650 V / 8 A class) is the common replacement, offering near-zero reverse recovery charge at a higher upfront cost. No last-time-buy window remains; procurement should qualify a substitute or secure inventory for remaining production runs.","metaTitle":"STTH8R04G 400V 8A Fast Recovery Diode, 50 ns trr, D2PAK","metaDescription":"STTH8R04G 400V 8A fast recovery diode, 50 ns trr, D2PAK. Specifications, datasheet, and replacement info.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"STMicroelectronics","Speed":"Fast Recovery =< 500ns, > 200mA (Io)","Series":"-","Package":"Tube","Technology":"Standard","Mounting Type":"Surface Mount","Package / Case":"TO-263-3, D²Pak (2 Leads + Tab), TO-263AB","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STTH8R04","Capacitance @ Vr, F":"-","Supplier Device Package":"D2PAK","Reverse Recovery Time (trr)":"50 ns","Current - Reverse Leakage @ Vr":"10 µA @ 400 V","Voltage - DC Reverse (Vr) (Max)":"400 V","Current - Average Rectified (Io)":"8A","Operating Temperature - Junction":"-40°C ~ 175°C","Voltage - Forward (Vf) (Max) @ If":"1.5 V @ 8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.7800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/0b648507ad441b0169f024e612607c9b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the STTH8R04G obsolete?","answer":"Yes, STMicroelectronics lists the STTH8R04G as obsolete. For new designs, a SiC Schottky in the same D2PAK footprint is a common replacement."},{"question":"What is the reverse recovery time of STTH8R04G?","answer":"The reverse recovery time (trr) is 50 ns, placing it in the ultrafast recovery class for hard-switching PFC and flyback converters."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH8R04G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH8R04G 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}}