{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T35CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T35CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T35CAY","factsUrl":"https://icboms.com/api/mcp/products/SM4T35CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T35CAY, Automotive TVS Diode, Bidirectional, 30V Standoff, 33.3V Breakdown, 64.3V Clamp, 400W Peak Pulse, DO-214AC SMA, AEC-Q101.","salesMarkdown":"## Automotive-grade TVS for 30V rail protection The single bidirectional channel clamps both positive and negative surges, so a single device covers a differential pair or an AC-coupled signal line where two unidirectional parts would otherwise be needed. The reverse standoff voltage is 30V, meaning the part does not conduct appreciably below that level — your 30V supply rail sees no leakage under normal operation. The minimum breakdown voltage is 33.3V, so the part starts to avalanche at roughly 10% above the rail, giving a clean trigger threshold. When the surge hits, the clamping voltage is held to 64.3V maximum at the peak pulse current of 36A (8/20µs waveform). That 64.3V clamp is what the downstream circuitry must survive; if your 30V-rated ICs have a 36V absolute maximum, this TVS provides a 28V margin between the clamp and the IC limit. ## Peak pulse power and temperature range Rated at 400W peak pulse power for the standard 10/1000µs waveform, the SM4T35CAY can absorb a substantial single-pulse surge — think load-dump or inductive kickback on an automotive 12V or 24V bus. At 150°C junction, the leakage and breakdown voltage shift slightly, but the part remains functional; the AEC-Q101 qualification includes high-temperature reverse bias testing to confirm that. Housed in the SMA package, the SM4T35CAY is a surface-mount device with a standard two-pad footprint. The SMA package is widely used for TVS diodes in automotive and industrial designs; its small body saves board space compared to the larger SMC package.","metaTitle":"STMicroelectronics SM4T35CAY TVS Diode, 400W, Bidirectional","metaDescription":"STMicroelectronics SM4T35CAY bidirectional TVS diode, 30V standoff, 33.3V min breakdown, 64.3V clamp, 400W peak pulse, AEC-Q101 qualified. Available to order.","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-214AC, SMA","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"400W","Base Product Number":"SM4T35","Operating Temperature":"-55°C ~ 150°C (TJ)","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"-","Supplier Device Package":"SMA (DO-214AC)","Voltage - Breakdown (Min)":"33.3V","Voltage - Clamping (Max) @ Ipp":"64.3V","Voltage - Reverse Standoff (Typ)":"30V","Current - Peak Pulse (10/1000µs)":"36A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM4T35CAY AEC-Q101 qualified for automotive use?","answer":"Yes, the SM4T35CAY is AEC-Q101 qualified, which means it has passed the automotive-grade reliability tests for temperature cycling, humidity bias, and high-temperature reverse bias. This qualification makes it suitable for under-hood and other automotive environments where standard commercial TVS diodes would not be accepted."},{"question":"Does SM4T35CAY have a bidirectional configuration?","answer":"Yes, the SM4T35CAY is a single bidirectional channel. That means it clamps both positive and negative transients, so one device can protect a differential pair or an AC-coupled signal line where two unidirectional parts would otherwise be needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T35CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T35CAY 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}}