{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTH312B","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTH312B","canonicalUrl":"https://icboms.com/stmicroelectronics/STTH312B","factsUrl":"https://icboms.com/api/mcp/products/STTH312B","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTH312B, Fast Recovery Diode, Standard type, 1200 V DC reverse, 3 A average rectified, 115 ns trr, 2 V forward at 3 A, DPAK surface-mount package, Tube.","salesMarkdown":"STMicroelectronics no longer manufactures this part in its original form. ## Key ratings at a glance The 115 ns reverse recovery time (trr) places it in the fast-recovery class — suitable for switching power supplies, PFC boost stages, and flyback snubbers where reverse-recovery losses matter. Junction temperature rating goes to 175°C max, giving some headroom in thermally constrained layouts. The tube shipping medium is noted, but the part is also available in tape-and-reel under related order codes. The tab is electrically connected to the cathode — keep that in mind for PCB layout and creepage distances at 1200 V. ## Reverse leakage and high-voltage behaviour Reverse leakage current is specified at 10 µA when the device is blocking 1200 V. That is a datasheet maximum at 25°C; expect leakage to increase with junction temperature, so derate accordingly in high-temperature environments. The fast-recovery classification (trr ≤ 500 ns at >200 mA) is confirmed by the 115 ns trr figure — well inside the class limit.","metaTitle":"STTH312B Fast Recovery Diode, 1200V 3A DPAK, Obsolete","metaDescription":"STMicroelectronics STTH312B fast recovery diode, 1200V 3A, 115ns trr, DPAK package. Obsolete.","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","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/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy STTH312B?","answer":"The STTH312B is obsolete from the manufacturer, but we source it through independent distribution channels. Submit an RFQ for current availability and pricing — we confirm both at quote time against our multi-source supply network."},{"question":"Is STTH312B obsolete?","answer":"Yes, the STTH312B is listed as obsolete by STMicroelectronics. No official replacement part number has been published, so you will need to evaluate a parametric equivalent if you cannot source the original through surplus channels."},{"question":"What is the replacement for STTH312B?","answer":"For a drop-in replacement, look for a 1200 V, 3 A fast-recovery diode in DPAK with a trr of 115 ns or faster — parts like the STTH3R12 or similar high-voltage ultrafast diodes from ST or competitors may fit, but verify pinout and thermal performance against your layout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTH312B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTH312B 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}}