{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T82AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T82AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T82AY","factsUrl":"https://icboms.com/api/mcp/products/SM4T82AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T82AY, Automotive AEC-Q101, SM4TY, TRANSIL™ series, Zener TVS diode, 70V reverse standoff, 400W peak pulse power, unidirectional, surface mount, DO-214AC (SMA), -55°C~150°C.","salesMarkdown":"## TVS diode for 48V and 60V automotive rails Rated at a peak pulse power of 400W (10/1000µs waveform), it holds off a 70V reverse standoff voltage and clamps a surge to 146V maximum at the rated peak pulse current of 16A (8/20µs waveform). This part is AEC-Q101 qualified, making it a documented choice for production programs that must submit PPAP evidence to an OEM auditor. ## What the protection window means for your rail For a nominal 48V or 60V automotive bus — common in mild-hybrid or 48V starter-generator systems — the 70V standoff provides enough headroom above the regulated rail to avoid nuisance triggering during normal load transients, while the 146V clamp keeps the downstream electronics below their absolute maximum rating. The 400W peak pulse power rating at the 10/1000µs waveform confirms it can handle the energy of a load-dump or inductive kick without exceeding junction temperature limits. ## AEC-Q101 — not just automotive-friendly The SM4T82AY carries an AEC-Q101 qualification, which is the discrete-semiconductor equivalent of AEC-Q100 for ICs. The SM4T82AY is supplied in the standard DO-214AC (SMA) surface-mount package. This is a common footprint shared across the SM4TY family and many other SMA-packaged TVS diodes, so a board layout designed for one SMA TVS will accept this part without a pad revision. The package supports automated pick-and-place assembly and reflow soldering. For a production buyer, the SMA package means the part can be sourced from multiple suppliers without a PCB change, reducing single-source risk on the BOM.","metaTitle":"STMicroelectronics SM4T82AY TVS Diode, AEC-Q101, 400W","metaDescription":"ST SM4T82AY automotive TVS diode, AEC-Q101 qualified, 400W peak pulse power, 70V standoff, unidirectional, SMA package.","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, SM4TY, TRANSIL™","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"Automotive","Mounting Type":"Surface Mount","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","Capacitance @ Frequency":"-","Supplier Device Package":"SMA (DO-214AC)","Unidirectional Channels":"1","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":"$0.6400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SM4T82AY/alternatives.json"},"ai":{"faq":[{"question":"Is the SM4T82AY AEC-Q101 qualified for automotive applications?","answer":"Yes, the SM4T82AY is AEC-Q101 qualified, which is the automotive stress-test qualification for discrete semiconductors. This means it meets the reliability requirements for under-hood and passenger-compartment automotive electronics and is supported by PPAP documentation."},{"question":"What is the peak pulse power of the SM4T82AY and is it unidirectional?","answer":"The SM4T82AY is rated for 400W peak pulse power (10/1000µs waveform) and is a unidirectional TVS diode. It has a single unidirectional channel, meaning it protects one rail with a single device, with the cathode band marking the polarity."},{"question":"Where can I buy the SM4T82AY and get a price?","answer":"The SM4T82AY is available to order through independent distribution. Pricing and current availability are confirmed at the time of RFQ — submit a request for a quote to receive a competitive offer for your required quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T82AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T82AY 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}}