{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T15AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T15AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T15AY","factsUrl":"https://icboms.com/api/mcp/products/SM4T15AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T15AY, Automotive AEC-Q101 Zener TVS, 400W Peak Pulse, 13V Reverse Standoff, 27.2V Clamp, 85A (8/20µs), DO-214AC SMA, Surface Mount.","salesMarkdown":"## What this Zener TVS protects and where It clamps transients on a 13 V nominal rail, with a minimum breakdown voltage of 14.4 V and a maximum clamping voltage of 27.2 V at the rated peak pulse current. The 400 W peak pulse power rating (10/1000 µs waveform) and 85 A peak pulse current capability (8/20 µs waveform) define the surge it can absorb without failing short. Packaged in a DO-214AC (SMA) surface-mount case, it is intended for overvoltage protection on automotive power lines, sensor inputs, and control module rails where AEC-Q101 screening is required. ## AEC-Q101 and the operating temperature range For a BOM destined for automotive or other high-reliability environments, the AEC-Q101 mark is the screening level that avoids the paperwork burden of an additional qualification run. The DO-214AC (SMA) package is a standard surface-mount outline with a JEDEC-registered footprint. No exposed pad or thermal vias are required; the junction-to-ambient thermal path relies on the solder joint and PCB copper area.","metaTitle":"STMicroelectronics SM4T15AY Zener TVS, AEC-Q101, 400W","metaDescription":"STMicroelectronics SM4T15AY automotive Zener TVS diode, AEC-Q101, 400W peak pulse, 13V standoff, 27.2V clamp, DO-214AC.","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":"SM4T15","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)":"14.4V","Voltage - Clamping (Max) @ Ipp":"27.2V","Voltage - Reverse Standoff (Typ)":"13V","Current - Peak Pulse (10/1000µs)":"85A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM4T15AY unidirectional or bidirectional?","answer":"It is a unidirectional Zener TVS, with one protection channel. The cathode band on the package marks the side that connects to the protected rail; the anode connects to ground."},{"question":"What is the difference between SM4T15AY and SM4T15?","answer":"The SM4T15AY is the AEC-Q101 automotive-qualified version of the base SM4T15. The electrical characteristics (breakdown, clamping, standoff voltages, peak pulse power) are identical. The 'Y' suffix adds the automotive-grade screening and traceability required for production parts in vehicle electronics."},{"question":"Is SM4T15AY RoHS compliant?","answer":"The part is listed as a current-production automotive-grade device from STMicroelectronics, which typically ships RoHS-compliant and halogen-free. Confirm the specific date-code compliance certificate with the supplier at order time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T15AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T15AY 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}}