{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T39AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T39AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T39AY","factsUrl":"https://icboms.com/api/mcp/products/SM30T39AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T39AY, Automotive AEC-Q101 TRANSIL™ Zener TVS Diode, 3000W Peak Pulse Power, 33V Reverse Standoff, 53.3V Clamp, 56.3A Peak Pulse Current, DO-214AB (SMC) Surface Mount Package.","salesMarkdown":"The STMicroelectronics SM30T39AY is a single-direction Zener TVS diode from the TRANSIL™ family, rated for 3000 W peak pulse power per the 10/1000 µs waveform. That 3 kW rating means it can absorb a serious transient — think load-dump or inductive kickback on a 24 V or 28 V nominal rail — without the part giving up. The 33 V reverse standoff voltage is the maximum DC voltage the diode will not conduct at; the 36.7 V minimum breakdown is where it starts clamping, and the 53.3 V maximum clamp at 56.3 A is the voltage the protected circuit sees during the event. For a 24 V automotive bus, this gives a healthy margin above the normal operating range while keeping the clamp below typical semiconductor breakdown thresholds. ## AEC-Q101 and the automotive build It is rated across the full -55 °C to 175 °C junction temperature range, so it can sit under the hood or in an engine-bay module without derating concerns. ## DO-214AB (SMC) — footprint and rework The SM30T39AY comes in the DO-214AB (SMC) surface-mount package. It is a standard two-pad footprint with a large tab for thermal transfer — the 3 kW pulse generates heat that needs to get into the PCB copper, so a solid via stitch under the pad is worth the board space. The package is large enough to hand-solder with a fine-tip iron if you are doing a field repair, though a hot-air station makes a cleaner swap. Orientation is marked by a cathode band on the body; the band end is the cathode, which connects to the positive rail in a typical reverse-polarity protection or clamping circuit. ## Sourcing and the BOM line For a production BOM, the AEC-Q101 qualification and the active lifecycle remove the usual single-source anxiety — no need to dual-source unless you want a second qualified supplier for volume leverage. The base product number is SM30T39, so any variant suffix (SM30T39AY, SM30T39A, etc.) shares the same die and package, differing only in testing or packaging options.","metaTitle":"STMicroelectronics SM30T39AY Zener TVS, 3000W, AEC-Q101, SMC","metaDescription":"STMicroelectronics SM30T39AY is a 3000W peak pulse power Zener TVS diode, AEC-Q101 qualified for automotive applications. 33V standoff, 53.3V clamp. SMC","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":"SM30T39","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"36.7V","Voltage - Clamping (Max) @ Ipp":"53.3V","Voltage - Reverse Standoff (Typ)":"33V","Current - Peak Pulse (10/1000µs)":"56.3A"}},"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 SM30T39AY AEC-Q101 qualified?","answer":"Yes, the SM30T39AY is AEC-Q101 qualified, as indicated by the series designation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T39AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T39AY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:56.097Z","lastPublished":"2026-07-16T15:42:56.097Z","indexable":true}}