{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T12CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T12CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T12CAY","factsUrl":"https://icboms.com/api/mcp/products/SM30T12CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T12CAY, Automotive Grade Zener TVS Diode, Bidirectional, 10V Reverse Standoff, 17V Clamping, 176A Peak Pulse, 3000W Peak Pulse Power, AEC-Q101 Qualified, DO-214AB SMC Package, -55°C to 175°C.","salesMarkdown":"## 3 kW automotive TVS for 12 V rails The STMicroelectronics SM30T12CAY is a single-channel bidirectional Zener TVS diode rated for 3000 W peak pulse power (10/1000 µs waveform), with a 10 V reverse standoff voltage and a maximum clamping voltage of 17 V at 176 A peak pulse current. It is qualified to AEC-Q101, making it suitable for automotive electronics where transient protection on 12 V power or signal lines is required. ## 17 V clamp — what it protects The 17 V clamping voltage means the SM30T12CAY holds the protected line below 17 V during a surge event, which is within the absolute maximum ratings of most 12 V-rated ICs and modules in automotive systems. The 176 A peak pulse current rating gives a sense of the surge energy it can absorb: a 3 kW pulse at the clamp voltage. This is a typical protection spec for load-dump and ISO 7637-2 pulses on 12 V vehicle power rails. ## Bidirectional — one device for AC or bipolar lines This is useful on signal lines that swing below ground (e.g., CAN bus, LIN bus, sensor outputs) or on AC-coupled interfaces where the protection device must not introduce DC offset. ## AEC-Q101 and the temperature range For designs targeting automotive OEM requirements, this qualification is a gate item — the SM30T12CAY carries it without needing a separate automotive-grade variant. For new designs, this means no immediate obsolescence risk.","metaTitle":"STMicroelectronics SM30T12CAY Automotive TVS, 3 kW","metaDescription":"STMicroelectronics SM30T12CAY automotive-grade Zener TVS diode, 3 kW peak pulse, 10 V standoff, 17 V clamp, AEC-Q101, -55 to 175°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Grade":"Automotive","Series":"*","Package":"Tape & Reel (TR) Cut Tape (CT)","Applications":"-","Mounting Type":"Surface Mount","Qualification":"AEC-Q101","Package / Case":"DO-214AB, SMC","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"3000W (3kW)","Base Product Number":"SM30T12","Operating Temperature":"-55°C ~ 175°C (TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Voltage - Breakdown (Min)":"11.4V","Voltage - Clamping (Max) @ Ipp":"17V","Voltage - Reverse Standoff (Typ)":"10V","Current - Peak Pulse (10/1000µs)":"176A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5843","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM30T12CAY bidirectional?","answer":"Yes, the SM30T12CAY has one bidirectional channel, clamping both positive and negative transients symmetrically. It is suitable for AC-coupled or bipolar signal lines like CAN bus or sensor outputs."},{"question":"What is the equivalent of SM30T12CAY?","answer":"The SM30T12CAY is the automotive AEC-Q101 graded variant of the SM30T12 base family; the 'AY' suffix denotes the qualification level."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T12CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T12CAY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}