{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T82CAY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T82CAY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T82CAY","factsUrl":"https://icboms.com/api/mcp/products/SM4T82CAY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T82CAY, Automotive TVS Zener, 400W Peak Pulse, 70V Reverse Standoff, 1 Bidirectional Channel, DO-214AC SMA, AEC-Q101, -55 to 150°C.","salesMarkdown":"## 400 W peak pulse — the surge rating that matters The SM4T82CAY is an automotive-grade TVS Zener from STMicroelectronics, rated for 400 W peak pulse power over the standard 10/1000 µs waveform. That 400 W rating is the part's headroom for clamping transients on a 70 V nominal rail — a 24 V truck or 48 V hybrid bus sees repeated load-dump spikes, and this diode shunts them to 146 V max before the silicon gives out. ## AEC-Q101 and the -55 to 150 °C window The operating junction range of -55 to 150 °C covers under-hood and engine-bay thermal cycling — the 150 °C ceiling is the die-attach limit, not the package. In a 125 °C ambient ECU, the junction stays inside the derated power curve. ## Bidirectional single-channel clamp One bidirectional channel — the breakdown starts at 77.8 V min and hard-clamps at 146 V max with a 16 A peak pulse current (8/20 µs waveform). No power-line protection because this is a signal-line TVS, not a mains-side suppressor. The 70 V reverse standoff sits safely below the 77.8 V breakdown knee, so the diode stays off during normal bus operation and only conducts when a transient pushes past the knee. ## DO-214AC SMA — footprint and sourcing reality Housed in a DO-214AC SMA package, the SM4T82CAY is a surface-mount part for standard reflow assembly.","metaTitle":"STMicroelectronics SM4T82CAY TVS Diode, 400W, AEC-Q101","metaDescription":"STMicroelectronics SM4T82CAY automotive TVS zener, 400W peak pulse, 70V standoff, AEC-Q101, DO-214AC SMA. Active lifecycle.","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":"SM4T82","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)":"77.8V","Voltage - Clamping (Max) @ Ipp":"146V","Voltage - Reverse Standoff (Typ)":"70V","Current - Peak Pulse (10/1000µs)":"16A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6000","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SM4T82CAY/alternatives.json"},"ai":{"faq":[{"question":"Is SM4T82CAY AEC-Q101 qualified?","answer":"Yes, SM4T82CAY carries AEC-Q101 qualification, making it suitable for automotive-grade applications requiring the stress and reliability screening that qualification entails."},{"question":"Is SM4T82CAY bidirectional?","answer":"Yes, it is a single bidirectional channel, clamping both positive and negative transients relative to the reference node."},{"question":"What is the peak pulse power of SM4T82CAY?","answer":"Peak pulse power is 400 W for the 10/1000 µs waveform, with a peak pulse current of 16 A for the 8/20 µs waveform."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T82CAY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T82CAY 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}}