{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T19AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T19AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T19AY","factsUrl":"https://icboms.com/api/mcp/products/SM30T19AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T19AY, Automotive AEC-Q101 TRANSIL™ TVS Zener, 3 kW peak pulse power, 16 V standoff, 26 V clamping, DO-214AB SMC, -55 to 175 °C.","salesMarkdown":"## 3 kW TVS Zener for automotive transient protection The STMicroelectronics SM30T19AY is a 3 kW peak-pulse-power TVS Zener diode from the TRANSIL™ family, designed for automotive transient suppression. It clamps a 16 V reverse standoff rail to 26 V at 115.4 A peak pulse current (10/1000 µs waveform), making it a fit for load-dump, alternator field decay, and inductive-load kickback in 12 V vehicle electrical systems. The AEC-Q101 qualification and -55 to 175 °C junction temperature range allow deployment in under-hood and engine-bay environments where ambient heat and repetitive surge stress are routine. The 26 V maximum clamping voltage at 115.4 A is the number that matters for downstream component stress. A 12 V nominal rail with a 36 V absolute-max input IC sees 26 V as a safe clamp — 10 V of margin below the IC's failure threshold. The 3 kW peak pulse rating (8/20 µs or 10/1000 µs waveform) covers the ISO 7637-2 pulse 5a load-dump energy typical of 12 V alternator systems. Because the device is unidirectional (single channel), it protects only positive transients; a bidirectional or series pair would be needed for AC-coupled lines. ## Active lifecycle and automotive qualification The AEC-Q101 qualification means it has passed the automotive-grade stress tests: high-temperature reverse bias, temperature cycling, and surge endurance.","metaTitle":"STMicroelectronics SM30T19AY TVS Zener, 3 kW, AEC-Q101","metaDescription":"STMicroelectronics SM30T19AY automotive TVS Zener diode, 3 kW peak pulse power, 26 V clamping, -55 to 175 °C, AEC-Q101 qualified.","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":"SM30T19","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC (DO-214AB)","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"17.8V","Voltage - Clamping (Max) @ Ipp":"26V","Voltage - Reverse Standoff (Typ)":"16V","Current - Peak Pulse (10/1000µs)":"115.4A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7098","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy SM30T19AY and get current pricing?","answer":"SM30T19AY is available to order through independent distribution."},{"question":"Is SM30T19AY AEC-Q101 qualified?","answer":"Yes, the SM30T19AY is AEC-Q101 qualified as part of the Automotive SM30TY series, making it suitable for automotive-grade applications including under-hood and engine-bay environments."},{"question":"What is the SM30T19AY equivalent?","answer":"The SM30T19AY is part of the SM30TY series from STMicroelectronics. Pin-compatible alternatives within the same DO-214AB footprint include other 3 kW TVS Zener diodes with different standoff voltages — for example, the SM30T18AY (18 V standoff) or SM30T20AY (20 V standoff) — but the 16 V standoff and 26 V clamp are specific to this variant. For a direct functional equivalent, look for an AEC-Q101 qualified, 3 kW, 16 V standoff, unidirectional TVS in SMC package from another manufacturer; verify clamping voltage and surge current ratings match your rail margin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T19AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T19AY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:54.746Z","lastPublished":"2026-07-16T15:42:54.746Z","indexable":true}}