{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM15T22A","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM15T22A","canonicalUrl":"https://icboms.com/stmicroelectronics/SM15T22A","factsUrl":"https://icboms.com/api/mcp/products/SM15T22A","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM15T22A, TRANSIL™ TVS diode, 1500W peak pulse power, unidirectional, 18.8V standoff, 20.9V breakdown, 39.3V clamp, DO-214AB SMC, -55°C to 150°C.","salesMarkdown":"## 1500 W peak pulse — what it buys the rail The STMicroelectronics SM15T22A is a unidirectional TRANSIL™ TVS diode from the SM15T series, rated for 1500 W peak pulse power over the standard 10/1000 µs waveform. With a reverse standoff voltage of 18.8 V, a minimum breakdown of 20.9 V, and a clamping voltage of 39.3 V at the peak pulse current of 254 A (8/20 µs), this part is sized to protect 18 V nominal DC rails — common in 24 V battery-backed industrial supplies — against transient overvoltages such as inductive load dumps or lightning-coupled surges. ## Clamping voltage and the protection window The 39.3 V maximum clamping voltage at the peak pulse current defines the upper limit the protected circuitry must survive. The 18.8 V standoff is the maximum DC voltage the TVS will not conduct at — so an 18 V rail running at 5% tolerance (18.9 V) would be borderline; a 15 V rail or a tightly regulated 18 V supply is a cleaner fit. The 20.9 V minimum breakdown gives a guard band: the part starts clamping before the rail exceeds the downstream components' absolute maximum ratings, provided those ratings are above 39.3 V.","metaTitle":"STMicroelectronics SM15T22A TVS Diode, 1500W, Unidirectional","metaDescription":"STMicroelectronics SM15T22A TRANSIL TVS diode, 1500W peak pulse, 18.8V standoff, 20.9V breakdown, 39.3V clamp. Unidirectional, DO-214AB SMC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"SM15T, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"General Purpose","Mounting Type":"Surface Mount","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"SM15T22","Operating Temperature":"-55°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"20.9V","Voltage - Clamping (Max) @ Ipp":"39.3V","Voltage - Reverse Standoff (Typ)":"18.8V","Current - Peak Pulse (10/1000µs)":"254A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8700","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/539ce92ad6505c8a9d704773ec1ef151.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM15T22A unidirectional or bidirectional?","answer":"The SM15T22A is a unidirectional TVS diode — one channel, cathode band on the package marks the protected side. It is intended for DC rail protection where the signal does not swing below ground."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM15T22A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM15T22A when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:03:10.402Z","lastPublished":"2026-07-16T15:03:10.402Z","indexable":true}}