{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T12AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T12AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T12AY","factsUrl":"https://icboms.com/api/mcp/products/SM4T12AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T12AY, Automotive AEC-Q101 TRANSIL™ Zener TVS diode, 400W peak pulse power, 10V reverse standoff, 21.7V clamp, unidirectional, SMA (DO-214AC) package.","salesMarkdown":"## 400 W peak pulse power in an SMA footprint It sits in the standard DO-214AC (SMA) surface-mount package, rated for 400 W peak pulse power (10/1000 µs waveform) and capable of handling 106 A peak pulse current under the 8/20 µs test condition. The reverse standoff voltage is 10 V, with a minimum breakdown of 11.1 V and a maximum clamping voltage of 21.7 V at the rated peak current. ## AEC-Q101 and the -55 to 150 °C range The AEC-Q101 qualification means this diode is screened for the stress tests automotive Tier-1s require — high-temperature reverse bias, temperature cycling, and humidity bias. ## Date-code and marking consistency The SM4T12AY is marked with ST's standard TRANSIL™ laser etch on the SMA body. For a buyer screening gray-market lots, the date-code font, pad geometry, and package flash should match ST's published marking layout for the SM4TY series. Any deviation — mismatched font weight, off-center laser, or inconsistent top-side ink — flags a potential re-mark. Physical authentication (decapsulation, X-ray) confirms the die matches the 400 W Zener structure, not a lower-rated die swapped in.","metaTitle":"STMicroelectronics SM4T12AY TVS Diode, AEC-Q101, 400W","metaDescription":"STMicroelectronics SM4T12AY automotive AEC-Q101 Zener TVS diode. 400W peak pulse power, 10V standoff, 21.7V clamp. SMA (DO-214AC) 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":"SM4T12","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)":"11.1V","Voltage - Clamping (Max) @ Ipp":"21.7V","Voltage - Reverse Standoff (Typ)":"10V","Current - Peak Pulse (10/1000µs)":"106A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6400","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is SM4T12AY AEC-Q101 qualified?","answer":"Yes. The SM4T12AY is listed under the Automotive, AEC-Q101 series, meaning it has passed the stress qualification tests required for automotive-grade semiconductors."},{"question":"What is the peak pulse power of SM4T12AY?","answer":"The SM4T12AY is rated for 400 W peak pulse power (10/1000 µs waveform) and can handle 106 A peak pulse current under the 8/20 µs test condition."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T12AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T12AY 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}}