{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T33AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T33AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T33AY","factsUrl":"https://icboms.com/api/mcp/products/SM30T33AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T33AY, Automotive AEC-Q101 TRANSIL™ Zener, 28V reverse standoff, 45.4V clamping, 3kW peak pulse power, DO-214AB (SMC) surface mount package.","salesMarkdown":"## What this Zener is and where it lands on the board The STMicroelectronics SM30T33AY is a single-direction Zener diode from the TRANSIL™ family, designed to clamp voltage transients on 28 V rails. It is rated for 3 kW peak pulse power (10/1000 µs waveform) and packs into a DO-214AB (SMC) surface-mount package. The 28 V reverse standoff means it sits across a supply line without conducting until a surge pushes it into breakdown at 31.1 V minimum; the clamp holds at 45.4 V maximum while shunting 66.1 A peak pulse current. The 3 kW peak pulse rating (10/1000 µs) is the headline number a designer uses to size the protection for a given surge energy. For a 28 V rail, this part can absorb a transient that would otherwise punch through a downstream regulator or controller. The 66.1 A peak current tells you the diode can handle a short, high-energy event without failing short — the usual failure mode for a Zener that is undersized for the surge. Because it is a single unidirectional channel, it protects one polarity. If the application needs bidirectional clamping on an AC-coupled line or a signal pair, you would use two back-to-back or a dedicated bidirectional TVS. ## Package and rework — DO-214AB (SMC) The DO-214AB (SMC) body is a standard footprint for automotive-grade TVS diodes. It is large enough to handle the 3 kW pulse without excessive die temperature rise, and the J-bend leads give a visible solder fillet after reflow. No orientation ambiguity.","metaTitle":"STMicroelectronics SM30T33AY Zener, 3kW, AEC-Q101","metaDescription":"SM30T33AY is a 28V standoff, 45.4V clamping, 3kW peak pulse Zener in DO-214AB SMC. AEC-Q101 qualified for automotive.","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":"SM30T33","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"31.1V","Voltage - Clamping (Max) @ Ipp":"45.4V","Voltage - Reverse Standoff (Typ)":"28V","Current - Peak Pulse (10/1000µs)":"66.1A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM30T33AY AEC-Q101 qualified?","answer":"Yes, the SM30T33AY is part of the Automotive, AEC-Q101 series, making it qualified for automotive applications per the AEC-Q101 stress test qualification for discrete semiconductors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T33AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T33AY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:45:24.747Z","lastPublished":"2026-07-16T14:45:24.747Z","indexable":true}}