{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T30CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T30CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T30CAY","factsUrl":"https://icboms.com/api/mcp/products/SM4T30CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T30CAY, Automotive Grade AEC-Q101 bidirectional TVS diode, 400W peak pulse power, 26V reverse standoff, 53.5V clamping, DO-214AC SMA package, -55°C to 150°C.","salesMarkdown":"## Why this TVS diode exists in your BOM The 26V reverse standoff voltage means it stays out of the way during normal operation, while the 28.9V minimum breakdown ensures the clamping triggers before the protected circuitry sees damaging overvoltage. ## Clamping voltage and surge current — what they mean for protection When the SM4T30CAY sees a transient exceeding the 28.9V breakdown threshold, it conducts and clamps the voltage to a maximum of 53.5V at the rated peak pulse current of 43A (8/20µs waveform). That 53.5V ceiling is the voltage the protected ICs must survive. For a 24V automotive bus, this leaves enough margin for most common 60V-rated downstream parts. The 400W peak pulse power is the energy-handling budget — if your application sees repetitive surges or longer-duration events, derate accordingly. The SM4T30CAY comes in the standard DO-214AC (SMA) package, surface-mount with two terminals. The SMA footprint is widely used and shared across many TVS diodes in this power class, so layout reuse across alternate sources is straightforward.","metaTitle":"SM4T30CAY TVS Diode, 400W Bidirectional, AEC-Q101, DO-214AC","metaDescription":"STMicroelectronics SM4T30CAY bidirectional TVS diode, 400W peak pulse power, 26V standoff, 53.5V clamping. 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","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":"SM4T30","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)":"28.9V","Voltage - Clamping (Max) @ Ipp":"53.5V","Voltage - Reverse Standoff (Typ)":"26V","Current - Peak Pulse (10/1000µs)":"43A (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 SM4T30CAY suitable for automotive applications?","answer":"Yes, it is rated Automotive grade and qualified to AEC-Q101."},{"question":"Is SM4T30CAY RoHS compliant?","answer":"The evidence does not explicitly state RoHS compliance, but the part is an active, current-production automotive-grade device from STMicroelectronics, which typically meets RoHS requirements. Verify the specific date code or certificate from your supplier if needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T30CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T30CAY 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}}