{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH312B-TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH312B-TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH312B-TR","factsUrl":"https://icboms.com/api/mcp/products/STTH312B-TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH312B-TR, Fast Recovery Diode, Standard, 1200 V, 3 A, 115 ns trr, Surface Mount, DPAK (TO-252-3).","salesMarkdown":"The STTH312B-TR is a 1200 V, 3 A fast recovery diode from STMicroelectronics, housed in a DPAK (TO-252-3) surface-mount package. Its 115 ns reverse recovery time places it in the fast-recovery class, distinct from standard recovery diodes that lack a controlled turn-off. This part is typically specified in power-factor-correction (PFC) boost stages, high-voltage flyback snubbers, and output rectification in switch-mode power supplies where reverse-recovery losses matter at the switching frequency. ## 115 ns trr — the switching-speed decision The 115 ns reverse recovery time separates this diode from a standard rectifier. In a continuous-conduction-mode PFC stage, that trr keeps the reverse-recovery charge low enough that the MOSFET or IGBT does not see a current spike at turn-on. ## Obsolete — sourcing and replacement planning If the board can tolerate a package change, the STTH312 family includes other 1200 V, 3 A variants in different packages; confirm the footprint and thermal pad before substituting. No pin-compatible second source is documented in the available records. ## DPAK footprint and junction temperature The DPAK (TO-252-3) package has a tab that carries the cathode current.","metaTitle":"STTH312B-TR Fast Recovery Diode, 1200 V, 3 A, 115 ns trr","metaDescription":"STTH312B-TR is an STMicroelectronics 1200 V, 3 A fast recovery diode with 115 ns trr in DPAK.","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":"Tape & Reel (TR); Cut Tape (CT)","Diode Type":"Standard","Mounting Type":"Surface Mount","Package / Case":"TO-252-3, DPak (2 Leads + Tab), SC-63","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Base Product Number":"STTH312","Capacitance @ Vr, F":"-","Supplier Device Package":"DPAK","Reverse Recovery Time (trr)":"115 ns","Current - Reverse Leakage @ Vr":"10 µA @ 1200 V","Voltage - DC Reverse (Vr) (Max)":"1200 V","Current - Average Rectified (Io)":"3A","Operating Temperature - Junction":"175°C(Max)","Voltage - Forward (Vf) (Max) @ If":"2 V @ 3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d7250be51ecf55d123f82f00d66e2919.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STTH312B-TR/alternatives.json"},"ai":{"faq":[{"question":"Is STTH312B-TR obsolete?","answer":"Yes, the STTH312B-TR is listed as obsolete."},{"question":"Is STTH312B-TR equivalent to standard recovery diodes?","answer":"No. The STTH312B-TR is a fast recovery diode with a 115 ns trr. Standard recovery diodes have a much longer, uncontrolled reverse recovery time and are not suitable for switching frequencies above a few hundred hertz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH312B-TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH312B-TR 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}}