{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH8R04DI","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH8R04DI","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH8R04DI","factsUrl":"https://icboms.com/api/mcp/products/STTH8R04DI","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH8R04DI, Fast Recovery Diode, 400 V Vr, 8 A Io, 50 ns trr, TO-220AC Insulated, Through Hole, -40°C to 175°C Junction.","salesMarkdown":"## 50 ns reverse recovery — switching-loss anchor for PFC and flyback The STTH8R04DI is a 400 V, 8 A fast-recovery epitaxial diode from STMicroelectronics, housed in a TO-220AC insulated package. Its 50 ns reverse recovery time (trr) at 8 A forward current places it squarely in the boost-diode tier for power-factor-correction stages and single-switch flyback converters where switching losses dominate the thermal budget. ## 8 A average current and 400 V blocking — derating and heatsink sizing At 8 A average rectified current and 1.5 V forward drop, the conduction loss is 12 W — that is the heat the TO-220AC tab must sink. The 400 V reverse voltage covers 240 VAC input rectified to ~340 VDC bus with margin for line transients. Reverse leakage is 10 µA at 400 V, negligible for the thermal calculation but worth noting for high-temperature standby power. The 50 ns trr keeps the switching energy per cycle low — in a 100 kHz PFC stage the turn-off loss is roughly proportional to trr times the bus voltage and current. That 50 ns figure is the datasheet typical; the actual loss depends on the di/dt the gate drive imposes, but it is the right ballpark for comparing against slower 200-500 ns recovery diodes.","metaTitle":"STTH8R04DI Fast Recovery Diode, 400V 8A, 50 ns trr","metaDescription":"STTH8R04DI from STMicroelectronics: 400V 8A fast recovery diode with 50 ns trr. TO-220AC insulated 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":"Tube","Technology":"Standard","Mounting Type":"Through Hole","Package / Case":"TO-220-2 Insulated, TO-220AC","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"STTH8R04","Capacitance @ Vr, F":"-","Supplier Device Package":"TO-220AC ins","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":"$2.0400","priceTiers":[{"qty":1,"price":"$2.16000","currency":"USD"},{"qty":10,"price":"$1.93900","currency":"USD"},{"qty":100,"price":"$1.55890","currency":"USD"},{"qty":500,"price":"$1.28080","currency":"USD"},{"qty":1000,"price":"$1.19700","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0b648507ad441b0169f024e612607c9b.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STTH8R04DI/alternatives.json"},"ai":{"faq":[{"question":"Is STTH8R04DI the same as STTH8R04D?","answer":"The STTH8R04DI uses the TO-220AC insulated package, while the STTH8R04D typically uses a non-insulated TO-220AC. The 'I' suffix indicates the insulated tab variant — electrically the same die, but the insulated package simplifies heatsink mounting without an extra insulator."},{"question":"What is the reverse recovery time of STTH8R04DI?","answer":"The listed reverse recovery time (trr) is 50 ns, measured under standard test conditions. This is a fast-recovery diode rated for switching frequencies where recovery losses matter."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH8R04DI","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH8R04DI 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}}