{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM15T18CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM15T18CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM15T18CAY","factsUrl":"https://icboms.com/api/mcp/products/SM15T18CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM15T18CAY, Automotive AEC-Q101 TRANSIL bidirectional Zener TVS, 1500W peak pulse power, 15.3V reverse standoff, 17.1V breakdown, 32.5V clamping, 308A (8/20µs), DO-214AB SMC, -40°C to 150°C.","salesMarkdown":"The STMicroelectronics SM15T18CAY is a bidirectional Zener TVS diode from the TRANSIL family, rated for 1500W peak pulse power over a 10/1000µs waveform. This is the headline rating that determines whether the part can absorb the transient energy expected in an automotive 12V or 24V rail without failing short. For a 15.3V reverse standoff voltage, the clamping is held to 32.5V at the peak pulse current of 308A (8/20µs waveform), which keeps downstream electronics within their safe operating area during load-dump or inductive kick events. The single bidirectional channel simplifies layout — one device protects a signal pair against both positive and negative transients, saving board space versus two unidirectional diodes back-to-back. ## Automotive-grade qualification AEC-Q101 qualification and the Automotive series designation mean this part is characterized and screened for the reliability demands of automotive electronics — under-hood ECUs, body controllers, infotainment, and ADAS sensor modules. ## Package and mounting Housed in the DO-214AB (SMC) surface-mount package, the SM15T18CAY is compatible with standard reflow soldering profiles. The SMC body handles the 1500W pulse without requiring a heatsink, relying on the PCB copper pour for thermal dissipation. Surface-mount assembly keeps the bill-of-material cost low compared to through-hole alternatives in the same power class.","metaTitle":"STMicroelectronics SM15T18CAY TVS Diode, 1500W, AEC-Q101","metaDescription":"STMicroelectronics SM15T18CAY bidirectional Zener TVS diode, 1500W peak pulse power, 15.3V standoff, AEC-Q101 qualified. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"Automotive, AEC-Q101, SM15TY, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"Automotive","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":"SM15T18","Operating Temperature":"-40°C~150°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"17.1V","Voltage - Clamping (Max) @ Ipp":"32.5V","Voltage - Reverse Standoff (Typ)":"15.3V","Current - Peak Pulse (10/1000µs)":"308A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1200","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/d3caa9efa0f4fede168088411f4832fd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM15T18CAY bidirectional?","answer":"Yes, the SM15T18CAY is a single bidirectional channel, clamping both positive and negative transients with one device. This is confirmed by the bidirectional channel count of 1."},{"question":"What is the peak pulse power of SM15T18CAY?","answer":"The SM15T18CAY is rated for 1500W peak pulse power over a 10/1000µs waveform, with a peak pulse current of 308A on the 8/20µs waveform."},{"question":"Is SM15T18CAY AEC-Q101 qualified?","answer":"Yes, the SM15T18CAY is part of the Automotive series and is AEC-Q101 qualified, making it suitable for automotive applications requiring stringent reliability screening."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM15T18CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM15T18CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:33:04.503Z","lastPublished":"2026-07-16T14:33:04.503Z","indexable":true}}