{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM30T42AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM30T42AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM30T42AY","factsUrl":"https://icboms.com/api/mcp/products/SM30T42AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM30T42AY, Automotive, AEC-Q101, TRANSIL™ TVS diode, 3kW peak pulse power, 36V reverse standoff, 58.1V clamping, 48.4A peak pulse current, DO-214AB SMC package, -55°C to 175°C.","salesMarkdown":"## 3 kW peak pulse power for automotive transient protection The STMicroelectronics SM30T42AY is a 3 kW peak pulse power (10/1000 µs) TVS diode from the SM30TY TRANSIL™ series, designed to clamp fast transients on automotive power rails. With a 36 V reverse standoff voltage and a 40 V minimum breakdown, it triggers before the protected circuitry sees damaging overvoltage. The clamping voltage is held to 58.1 V at the rated peak pulse current of 48.4 A, which keeps the stress on downstream components within their safe operating area for a 12 V or 24 V automotive bus. AEC-Q101 qualification and the -55°C to 175°C junction temperature range make this part suitable for under-hood, engine bay, and other high-temperature automotive environments where reliability screening is required. ## Package and footprint for the BOM The SM30T42AY is supplied in the DO-214AB (SMC) surface-mount package, a standard footprint for 3 kW-class TVS diodes. The SMC body provides adequate copper area for heat sinking during the pulse event. This is a standard catalog item from STMicroelectronics, available through independent distribution channels.","metaTitle":"STMicroelectronics SM30T42AY TVS Diode, 3kW, AEC-Q101, SMC","metaDescription":"STMicroelectronics SM30T42AY automotive TVS diode, 3kW peak pulse power, 36V standoff, 58.1V clamp, AEC-Q101, -55°C to 175°C, SMC package. Available to order.","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":"SM30T42","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"SMC","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"40V","Voltage - Clamping (Max) @ Ipp":"58.1V","Voltage - Reverse Standoff (Typ)":"36V","Current - Peak Pulse (10/1000µs)":"48.4A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.3500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/c1da1532b421560a6148be51fb30338a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does SM30T42AY have AEC-Q101 certification?","answer":"Yes, the SM30T42AY is AEC-Q101 qualified as part of the Automotive SM30TY series, making it suitable for automotive-grade applications requiring documented reliability."},{"question":"What is the peak pulse power of SM30T42AY?","answer":"The SM30T42AY is rated for 3 kW peak pulse power (10/1000 µs waveform), clamping 48.4 A to 58.1 V maximum."},{"question":"Is SM30T42AY a direct replacement for SM30T42?","answer":"The SM30T42AY is the AEC-Q101 qualified variant of the base SM30T42. Electrical characteristics (standoff, breakdown, clamping, peak current) are identical; the 'AY' suffix adds automotive-grade qualification. It is a drop-in replacement for designs requiring the automotive certification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM30T42AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM30T42AY when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T15:42:51.488Z","lastPublished":"2026-07-16T15:42:51.488Z","indexable":true}}