{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SM4T23AY","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"SM4T23AY","canonicalUrl":"https://icboms.com/stmicroelectronics/SM4T23AY","factsUrl":"https://icboms.com/api/mcp/products/SM4T23AY","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics SM4T23AY, Automotive AEC-Q101 TRANSIL™ Zener TVS, 400W peak pulse power, 20V reverse standoff, 42.8V clamping, unidirectional, DO-214AC (SMA), -55°C to 150°C.","salesMarkdown":"## 400W Zener TVS for automotive rail protection It clamps a 20V nominal rail at 42.8V maximum during a 400W peak pulse (10/1000µs waveform), with a peak pulse current rating of 54A (8/20µs). The 22.2V minimum breakdown voltage gives you a clean guard band above the 20V standoff — the rail stays protected without nuisance triggering from normal supply ripple. ## AEC-Q101 and the 150°C junction limit No last-time-buy risk on this line; it remains a current-production part for new vehicle platform designs. ## DO-214AC footprint and surface-mount assembly Housed in a DO-214AC (SMA) package, the SM4T23AY is a surface-mount device with a standard two-pad footprint shared across the SM4TY series. The SMA body is small enough for dense ECU layouts but still dissipates the 400W pulse without requiring an external heatsink — the junction absorbs the transient, then cools through the copper pads and board plane. No power line protection (unidirectional only), so wire it between the protected rail and ground with the cathode to the rail.","metaTitle":"STMicroelectronics SM4T23AY Zener TVS, 400W, AEC-Q101","metaDescription":"Automotive-grade Zener TVS diode, 400W peak pulse power, 20V standoff, 42.8V clamping. AEC-Q101 qualified. Active lifecycle.","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":"SM4T23","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)":"22.2V","Voltage - Clamping (Max) @ Ipp":"42.8V","Voltage - Reverse Standoff (Typ)":"20V","Current - Peak Pulse (10/1000µs)":"54A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.8900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/45721247f0377ca5ff3983c35eddc2fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the peak pulse power of SM4T23AY?","answer":"The SM4T23AY is rated for 400W peak pulse power per the 10/1000µs waveform, with a corresponding peak pulse current of 54A under the 8/20µs condition. That 400W rating is the maximum the device can clamp in a single pulse before the junction temperature exceeds the limit."},{"question":"Is SM4T23AY automotive qualified?","answer":"Yes, the SM4T23AY is AEC-Q101 qualified as part of the Automotive SM4TY series. This qualification covers the full automotive stress test suite, making it suitable for under-hood, chassis, and body-control modules where reliability screening is mandatory."},{"question":"What is the difference between SM4T23AY and SM4T23A?","answer":"The SM4T23AY is the automotive-grade (AEC-Q101) variant of the base SM4T23A. Electrically — same 20V standoff, 22.2V breakdown, 42.8V clamping, and 400W peak pulse — the difference is the qualification level. The 'Y' suffix parts are screened and released for automotive production lines; the non-Y variant is the commercial/industrial grade. For a BOM that requires AEC-Q101 traceability, the SM4T23AY is the correct choice."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/SM4T23AY","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/SM4T23AY 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}}