{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T30CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T30CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T30CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T30CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T30CAY, Automotive AEC-Q101 TRANSIL™ bidirectional Zener TVS diode, 3000W peak pulse power, 26V reverse standoff, 42.1V clamping, 71.3A peak pulse current, DO-214AB SMC package, -55°C to 175°C.","salesMarkdown":"## Automotive-grade transient suppressor for 26V rails The STMicroelectronics SM30T30CAY is a bidirectional Zener TVS diode from the TRANSIL™ family, qualified to AEC-Q101 for automotive applications. It protects a single 26V nominal rail against transients up to 3kW peak pulse power (10/1000µs waveform), clamping at 42.1V maximum while conducting 71.3A peak pulse current. The DO-214AB (SMC) surface-mount package suits automated assembly lines common in automotive ECU production. ## What the 3kW rating means for your protection budget The 3000W peak pulse power rating at 10/1000µs defines the device's ability to absorb a single high-energy surge without failing. For a 26V rail, this translates to a clamping voltage of 42.1V at the rated current — the downstream circuitry must survive that peak. The 71.3A peak pulse current figure gives the surge-handling capacity in amperes, which is the parameter most directly comparable to the threat waveform in standards like ISO 7637-2 or ISO 16750-2 for automotive load dump and jump start. ## Temperature range and automotive deployment The 175°C upper limit accommodates hot spots near exhaust manifolds or turbochargers, while the -55°C floor handles cold-crank and arctic storage conditions. ## Lifecycle and sourcing posture For production BOMs requiring dual sourcing, the base product number SM30T30 covers the family — the CAY suffix denotes the bidirectional, AEC-Q101 qualified variant in the SMC package.","metaTitle":"STMicroelectronics SM30T30CAY Automotive TVS, 3kW, DO-214AB","metaDescription":"STMicroelectronics SM30T30CAY bidirectional Zener TVS diode, AEC-Q101, 26V standoff, 42.1V clamping, 71.3A peak pulse, -55°C to 175°C.","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, SM30TY, 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":"3000W (3kW)","Base Product Number":"SM30T30","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"28.9V","Voltage - Clamping (Max) @ Ipp":"42.1V","Voltage - Reverse Standoff (Typ)":"26V","Current - Peak Pulse (10/1000µs)":"71.3A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5000","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between SM30T30CAY and SM30T30CA?","answer":"The SM30T30CAY is the AEC-Q101 qualified automotive-grade variant of the SM30T30CA. The CAY suffix indicates automotive qualification with full PPAP documentation support, while the CA variant is the commercial-grade version without AEC-Q101 certification."},{"question":"Does the SM30T30CAY require external power line protection?","answer":"No. The SM30T30CAY is a bidirectional Zener TVS diode that provides transient voltage suppression directly on the protected rail. It does not integrate power line protection features such as overcurrent limiting or reverse polarity protection — those functions require separate components."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T30CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T30CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:54:37.719Z","lastPublished":"2026-07-16T14:54:37.719Z","indexable":true}}